Science topic

Biopolymers - Science topic

Polymers synthesized by living organisms. They play a role in the formation of macromolecular structures and are synthesized via the covalent linkage of biological molecules, especially AMINO ACIDS; NUCLEOTIDES; and CARBOHYDRATES.
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Dear sir/madam,
Can you suggest which food component or biopolymer gives peak at 2000 wavenumber in Raman spectroscopy?
Thank you in advance,
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Information is very scarce, since compounds usually have several peaks. By searching for pictures, i managed to find only an artifact with this wavenumber. The nature of the artifact is unfortunately not disclosed.
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A while ago I did research on arabinoxylan gels using maize arabinoxylans sourced from Cambridge Biopolymers Ltd (UK). I would like to pursue this work further (and include mixed linkage glucans), but I find that the company has closed. Can anyone tell me if there are other companies which sell similar materials (preferably in the UK)?
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The problem with Megazyme is that they only sell in 3g or 5g quantities. I need 100 - 500g. Cambridge Biopolymers used to offer that, but so far I haven't been able to find anyone else who does.
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Dear scientists
Which type of dialysis membranes are preferable to use with chitosan and biopolymers ?
Can be used one more time these membranes?
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Dear Hazem Choukaife
Thank you for your response. In addition, is it suitable to use centrifuger (if yes which type)?
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Electrospinning
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Dear Akuleti Saikumar, you can change the ionic strength by adding small amount of salt, or use a higher conductivity constant solvent. What is the solvent used ? My Regards
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Anyone Can suggest me Lignin Bio-polymer application and its uses or any research which is currently happening in Lignin Nano-particles or lignin nano-composites materials in human welfare and in drug delivery.
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Bacterial cellulose (BC) is a natural biopolymer metabolized by Gram-negative bacteria strains in Carbon- and Nitrogen-rich media. Due to its natural purity and biodegradability it is considered to be an exceptional biomaterial with versatile scientific and commercial applications. Due to such a prominent potential use, further studies on such kind of materials should be established. Thus, what are the potential methods to study mechanical, molecular and structural properties of bacterial cellulose-based composites?
Thanks for any kind of your ideas and thoughts.
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Dear Vadym Chibrikov, there are various applications of BC in composites. Please have a look at the following documents. My Regards
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I am trying to prepare drug-loaded porous silica nanoparticles coated with biopolymers. I want to tag some targeting ligands and some molecules. I wanted to know if the functionalization should be done on the surface of the coated biopolymer or the silica nanoparticles?
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in downstream processing of biopolymer some quantity of protein still remains even after treating enzymatically which are known for protein removal.
looking for complete removal of protein from polymer, please suggest commercially feasible options.
protein source is bacteria whose outer layer consist of lipids and protein
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Dear all, the conventional way is via 'sevag method for deproteinization'. Please make simple google search using the keyword 'methods of deproteinization'. The following sample documents may help. My Regards
10.4028/www.scientific.net/AMR.340.416
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Chitosan is a natural biopolymer with antibacterial properties and the solution of chitosan is prepared in acetic acid. So, has acetic acid any effect in contributing towards the antibacterial behavior of chitosan?
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Based on the following link it was observed that chitosan water-acetic acid systems show the highest antimicrobial activity due to the highest chitosan charge density, compared to the mixtures with lactic and citric acid.
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I obtained an EIS data when I am doing research on biopolymers for corrosion inhibition. But I can not find a good fit of equivalent circuit. Could any body help me with it?
I have attached the data file in which the first column is the frequency, the second column is the Z' and the third column is the Z''.
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Could you provide more details about your surface morphology ? ... Is it only a metal covered with this biopolymer ? ... The choice of an equivalent circuit depepnds strongly on what is happening on your surface (electrochemical and physical phenomena) and the state of your surface (porosity, coating, protected and unprotected areas ... ). Your data is corrected for the ohmic drop or not ?
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I am relatively new to DSC. Recently, I ran DSC on starches but always got this broad endothermic peak which I could not explain. Please see the attached isotherm of a starch sample and my method is listed below.
1: Equilibrate at -50.00°C
2: Ramp 20.00°C/min to 220.00°C
3: Mark end of cycle 0
4: Isothermal for 5.00 min
5: Ramp 5.00°C/min to -80.00°C
6: Mark end of cycle 1
7: Ramp 15.00°C/min to 200.00°C
8: Mark end of cycle 2
9: End of method
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Thank you all for your answers. I am running an isothermal experiment to confirm if the peak is indeed coming due to the moisture loss.
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Hello, we want o make biopolymer composite wires using 3D printing (using our solution and not a ready filament of course) and I wonder which biopolymer or even a plasticizer is recommended in order to get ductile wires. Most of what we produce is brittle wires for now. Thanks in advance.
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You need to be very careful with your selection because of extractables and leachables. It depends on your application (patient contact/long term vs short term). Maybe take a closer look at some of the USP Class VI or ISO 10993 rated Polyurethane based photopolymer resins but you might need to use a top down printer to reduce the need for supports depending on the length of the wire and overall geometry. These usually contain some degree of PEGDMA. Also be careful of what type of photointiator you are planning on using.
The end result after curing is typically a polymer with low molecule weight photolites left over that can migrate easily out of the polymer itself after curing and through skin, food packaging and other similar examples. A lot of work is being done to reduce extractables and leachables but applications such as long and or short term skin contact (intact skin vs rating for contact with mucosal membranes) has been successful if you look around at some offerings from some of the larger 3d printing names in the industry.
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Hello all, I am looking for a model drug to encapsulate into a biopolymer. It should be soluble in acetone but it should not dissolve in ethanol. I will appreciate it if you have any suggestions.
Thanks in advance.
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Hi, Elena. Retinoic acid is soluble in both solvents, but it is more soluble in acetone. I hope it helps
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So far, when I looked on molecular docking papers, it often involves using a protein as the receptor molecule, with ligands like another protein, nucleic acids, or small molecules. I have also found the application of RNA or DNA as the receptor molecules, docked against another RNA or DNA, and small molecules. However, I never (yet) found a paper referring of using other polymers as receptor molecules, like lipid or nanocarrier polymers (like chitosan or cellulose or even carbon nanotube). Is there a reason that nobody does that? Or some research groups have already done that? I am just curious.
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These things are already mentioned in many papers. We recently did the same analysis against SARS CoV-2
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Most of the 3D printing resins are synthetic chemicals. Is there any biopolymers to replace resins. If so kindly share some lietrature and suggestion for using biopolymers for 3D printing
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Dear Sudhakar M.P , your definition of biopolymer is not clear. Biopolymers can be divided into bio-based polymers and biodegradable polymers. Bio-based polymers are produced from biosources and can be biodegradable or not, for example, starch or bio-based PE. Similarly, biodegradable polymers can be either bio-based or fossil-based, for example, PBAT is fossil-based while PLA is bio-based.
Now, come back to your questions, I think PLA has been used extensively in 3D printing and PLA is both bio-based and biodegradable.
Best regards,
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Anyone tell the current trend in edible films and coatings? Hydrogel can be used for making films
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Dear Arjun Arulvel, the following chapter deals with the latest progress in this area. My Regards
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The Flory-Huggins theory (1942) has been widely used to account for the mixing energy between long-chain, flexible polymers (e.g., rubbers) and solvents. Can it be used for semi-flexible and rigid biopolymers like actins, microtubules, fibrins, and collagens?
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I am blending PBAT and PLA using extrusion machine. However, the PLA/PBAT blended pellets start to agglomerate, and fail to pass along the screw, as soon as I introduce the pellets in extrusion film blow machine! Is this pellets agglomeration issue common in PBAT~based blends?
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If I understand correctly, you already mixed the two polymers and obtained the pellets of that blend. Your problem is how to avoid the agglomeration of the pellets of the blend. I think you need to dry properly the pellets before feeding the film blow machine.
For your answers, you have already tried using dry pellets. It's worked! But, you add CaCO3, too. I think as CaCO3 is a descant, it acted on maintenance of low moisture.
I think your solution is to dry the pellets only.
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CNF is well known to interact with a great number of synthetic or biopolymers via hydrogen bond leading to the hydrogel production. sometimes it directly forms hydrogel without any cross-linker. then, why cant it directly form hydrogen interaction with lignin which is originally linked by hydrogen bond in the natural cell wall ? i am trying to fabricate CNF-lignin directly inspired from natural cell wall. but no succeed. Anyone can give good explanation of it?thanks
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in details?
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Hello, I am trying to find the solution for the adsorption energy calculation of polymer with any of the chemicals or metals, for this calculation, I am using the adsorption locator module of the material studio. Since I am using biopolymer so there are no such reference for adsorption locator is available.
How can we validate these results, or is there any specific adsorption energy range available that validates our result?
Does anyone have done adsorption calculation for chemical-polymer interaction from the material studio?
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Helllo ,
Adsorption energy:
The heat of adsorption (∆H) can be calculated on basis of a langmuir adsortpion isotherm at different temperatures.
The Langmuir isotherm constant is equivalant to equilibrium constant after adjusting the units to mol/L.
Over the conection of ∆G and K and ∆G with ∆H & ∆S you can calculated the energie.
For this calculation you don't need any special software.
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Chitosan precipitation
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I guess it depends on why he needs that chitosan for. According to the literature, the chitosan at high pH will crosslink itself and it slowly increases the solution viscosity, what would be nice for some applications. it also depends on chitosan Mw and %DD
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concentration: 1and 2 %w
Solvent: deionized water
Storage time: 1 or a few days
Also a layer of mold can be see on it.
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Labile H are lost.
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The material is a biopolymer (biomass) The broad peak I think is an OH peak suggesting an intermolecular hydrogen bonding interaction normally observed in homopolymers and copolymers. but the shoulder around 3249 I got no explanation.
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Hi.
I believe that, if not an artefact, peaks at 3249 cm-1 can typically be explained by the presence of clusters containing significant amounts of three- and four-coordinated water molecules. However, it's been long since I worked with FTIR so double-check this.
Cheers!
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I am trying to dissolve chickpea protein isolate in water but it's not soluble even with raised temperature and constant shaking. Can anyone please suggest the appropriate method or solvent other than water in which chickpea protein isolate gets completely soluble.
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i prepared 1%wt and 2%wt sodium alginate solution with 9 pH and 0.5 molar copper sulfate.
by adding alginate solution to the electrolyte (CuSO4), it is expected to have copper alginate gel in bead form. but i gained very thin very loose small film.
and by adding the electrolyte on the surface of the alginate solution, it is expected to have a thick stable membrane of copper alginate gel that will stay on the surface, but my membrane sinks in alginate solution slowly.
my main purpose is making capillary copper alginate gel.
thank you
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Dear Raheleh Ebrahimi many thanks for asking this very interesting technical question. I just came across two potentially useful articles in which the preparation of capillary copper alginate gel has been described in detail. In this context please have a look at the following links:
Gelatinized Copper–Capillary Alginate Gel Functions as an Injectable Tissue Scaffolding System for Stem Cell Transplants
Also please see:
Modeling capillary formation in calcium and copper alginate gels
Unfortunately these articles have not yet been posted as public full texts on RG. Please see if you can access them thropugh your institution. Alternative you could request the full texts of the papers directly from the authors via RG.
Good luck with your work and best wishes!
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At the moment of meassuring a polymer viscosity which one would you recomend? reomether, digital viscosymeter or glass viscocymeter.
It's for a biopolymer in solution that's is undergoing electrospinning.
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Dear all, since it is concerned by electrospinning, knowing the MW and the range of viscosity/concentration are essential for the electrospinnability. Capillary viscometers are nowdays fully automated, the operators errors are at least significance. So, I recommand an Ubelhode viscometer. My Regards
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TiO2 contents are dependent on room temperature optical transmittance (in the UV-Vis region) of different PLA nanocomposites with the neat PLA film. Optical transmittance of polymer-based biodegradable films is significant for sundry industrial applications, especially in food packaging where the attractiveness of the food by customers potentially depends on the aesthetic view by naked eyes under visible light illumination.
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Transparency of the films can be controlled by two ways
1. by controlling the concentration of nanoparticles in the composite film
2. By changing the nano particles with those who gives more transparency to the composite films
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what are the effects of the Simulated Body Fluid (SBF) corrosion solution on the stress and Elongation of biopolymers?
Best regards.
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Bioplymer alone or as a coating on top of a metal? Is metal corrosion involved?
Like coatings in general, water uptake is a first point to look at, changes mechanical properties as well.
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RAMAN SPECTROSCOPY?
MS SPECTROMETRY?
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Dear Elizabeth Espinoza,
Like an answer from Malairajan and Ramachandran, the biopolymers such as cellulose, hemicellulose, and lignin most need to isolated before tested.
If possible you should try both as Raman spectroscopy (RM) is provided molecular fingerprint profiles and functional group information and, Mass spectrometry (MS) is a method used to detect the molecular weights and structural information.
These two resources could be the more suitable information as references to your question.
2. Ali, A., Abouleila, Y., Germond, A. An Integrated Raman Spectroscopy and Mass Spectrometry Platform to Study Single-Cell Drug Uptake, Metabolism, and Effects. J. Vis. Exp. (155), e60449, doi:10.3791/60449 (2020).
Best Regards,
Virak Sorn
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In classical biotechnology, three stages are distinguished: pre-fermentation, fermentation, post-fermentation. Typical equipment used in biotechnological industries is known. Are there any features in the hardware design of biopolymer production, such as proteins (enzymes), polysaccharides (starch, cellulose), lipids (lipids of microalgae)?
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For thickening polysaccharides, like xanthan, mixing to ensure gas exchange is the limiting factor. At late stages, the injected air tends to rise in huge bubbles with very little exchange.
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I want some information specially some papers about chitosan biopolymer and the industerial methods to get it from shrimp shell
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Please read chapter ir chitin chitosan writen by boukhlifi fatima
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Hello all,
I have a two graph ( TGA and DSC) of a biopolymer that I see decomposition starts around 170C. However once I run the DSC I do not see any melting or crystallization peak. Why?
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Try to decrease the heating rate, crystallization and melting are affected by these parameters. you can also first determine the Tg, this gives you information about the properties of your polymers.
To note; it's not easy to get information from a single measurement.
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I would like to know if the properties of a polymer impact on the size of the particle it forms. I'm working with different polyssacharides (alginic acid from different seaweed), which are precipitated by the exact same method. Is it to be expected that the mean particle size of the polymers are different (because of molar mass, polydispersivity, monomers ratio, polarity - one of them has high hydroxyl content -, branching...)? Or is the particle size normally an exclusive function of the process and not the chemical nature of the material?
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Dear all, chains architecture influences to a great deal the spatiale arrengement and close packing. Presence of net charges, stiffness of the main backbone, and bulky side groups, all contribute to affect particle size and shape. In addition to structural parameters, preparation techniques of nanoparticles also influence the size and shape. It is generally agreed that anti-solvent previpitation technique is the most simple and efficient technique to produce nanoparticles with average size ~200nm with good size distribution. My Regards
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I am looking for polymers/biopolymers with high hydrophobicity and high gas permeability. Can any one recommend any types of polymers/biopolymers?
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Hi Niloufar,
Did you try PDMS? Its hydrophobicity and air permeability can be easily tailored; and may meet your requirements.
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I wanted to know about the journal with a high rate of acceptance and sci index.
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Sanjay Kumar , there is a journal called "Polymers" among MDPI journals, it is sci indexed and has a relatively short peer review process but it is open access (APC is required), in case you are interested.
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Dear Researchers,
Please, which papers, sites, tools, or programs you recommend to use in the design and selection of the best materials for prosthetic leg liners?
Regards,
Akram
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Dear Dr. Akram Jassim Jawad ,
in addition to the answer of Dr. Abdelkader BOUAZIZ ,
-a Silicone liner provides high stability and good adhesion if your limb has a lot of soft-tissue. ...
-Polyurethane has a unique ability to flow away from high pressure. ...
-copolymer is soft, cushiony and highly elastic, offering good protection for amputees with sensitive skin and/or lower activity levels.
For more details, please see at:
- What materials are used to manufacture prosthetic liners?
- All About Prosthetic Liners: Part 2 Choosing the best material.
Best regards, Pierluigi Traverso.
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I tested several non-traditional soil stabilizers (e.g. ligninsulfonate, biopolymers) with two different concentrations. The standard Proctor test showed that the additives reduced the OMC and increased the MDD of the soil. Further, the data indicated that an increase in concentration reduced and increased the MDD, respectively, decreased and increased the OMC. How can this behaviour be explained?
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The increase in density is expected since u adding new material to the soil and that material filled the pores. Water was reduced because this material u added reduced somehow the affinity of the soil water. For example if the soil has clay, something is going pin on mice-scale. for example the available surface area was decreased therefore a decrease in action exchange capacity is expected. this less affinity for water.
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What chemical bond is created by the Boron nitride/biopolymer on copper substrate to prevent copper deterioration? kindly give an explanation.
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Welcome!
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i want potassium nitrate to be get crosslinked to biopolymer..so weather pot.nitrate will be partially dissolve in ethanol or not?if yes den weather crosslinking will be done in partially dissolve solvent?
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On the matter of precipitation of the potassium nitrate assisted by methanol addition ― cf. German Patent 406,413.
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I have a liquid polyanhydride that is not soluble in water made from succinic acid and ricinoleic acid and I need to make it a hard gel. Investigating I found that it is possible to do this by crosslinking, however, this is carried out with polymers such as cellulose or dextran and crosslinkers such as citric acid or glutaraldehyde are used, which are soluble in water.
My question is whether it is possible to carry out crosslinking using these water soluble agents, and if not, what crosslinking might serve and what method of crosslinking would be appropriate?
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Dear Ricardo Cedeño, why not trying a mixture of Solvents (water+solvent), the second solvent should be good for the polymer and at the same time miscible with water. If this is possible try different proportions. My Regards
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I have been trying hard for a month to observe some definite structure of the biopolymer which was synthesized by our lab. The irony is it cannot be dissolved in any organic solvent and we are left only with some aqueous buffer for our studies.
Since SEM requires solid samples i highly doubt to see anything under it except for some random aggregates.
Even in regular TEM I can only see indefinite aggregations of polymer. I have tried staining as well which in some instances effected polymer structures, like i have seen some nano vesicles but those were not the representative of the sample.
Please dont recommend cryoTEM because we are struggling hard to get the dates, but chances are not likely.
Need Help!
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I have a liquid polyanhydride that is not soluble in water made from succinic acid and ricinoleic acid and I need to make it a hard gel. I think I can cross-link using ethylenediamine, but I'm not entirely sure. How can I cross-link with ethylenediamine or some other substance?
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Hi Stjepan Krešimir Kračun;
I completely agree with you, methacrylate and acrylate monomers form strong, hard polymers with excellent dimensional stability. However, the hydrolytic instability of the ester bond is very advantageous for certain medical applications (degradation of these polymers) such as: hydrogels for angioplasty or drug delivery.
With my best regards
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I would like to lubricate the PLA with a plasticizer while without compromising the PLA compostability.
Your suggestions/comments are highly appreciated in advance.
Cheers
Raj
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Dear Rajendran,
If you are looking for a “solid” plasticizer, PEG with molecular weights of 1500 or higher, could also be a good alternative for some specific applications requiring PLA with improved toughness and ductility. For more information, I strongly recommend taking a look on the following reference:
Alexandre Ruellan, Violette Ducruet and Sandra Domenek, (Chapter 5) Plasticization of Poly(lactide), in book: Editors: Alfonso Jiménez, Mercedes Peltzer, Roxana Ruseckaite, Poly(lactic acid) Science and Technology: Processing, Properties, Additives and Applications, 2015, https://pubs.rsc.org/en/content/chapter/bk9781849738798-00124/978-1-84973-879-8
Good luck and best regards,
Marius
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Dear all,
I have coated MnCO3 microparticles with different biopolymers through Layer-by-layer approach.
I am not sure how to analyze the sample under SEM.
I fear sputtering might damage the coating.
My sample is in powder form.
Thanks in advance
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If you use KBr pellet you might have scattering problem using IR if you have microparticles but not if you use a micro-Raman. You can always use ATR-FTIR to avoid the problem. This would tell you if you have polymer in the sample (not necessary if that polymer is where you want it to be).
Maybe you could use backscattering SEM to check if you have organic on the Mn particle surface or use a transmission technique (TEM or optic microscopy if both particles and shell are tiny or big enough).
Also an Mn quantification might help to know how mich of your final mass is MnCO3 and how migh is possibly polymer.
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Other than extraction of PHA from bacterial cells are there any other methods to quantitatively analyse PHA
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Hello, we used a range of methods in this paper:
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My high school Bio-Inspire Design students are trying to develop a waterproof/resistant biopolymer film for marine applications. Their curious about PLA and wonder if there's a low tech way to make it without the use of many chemicals or fancy equipment.
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Dear John,
Nice objectives, but a complex and hard work to be realized!
I believe that a strategy with the main goal to produce competitive PLA films going from lactic acid, could imply some advanced skills and a reach experimental program (I will not develop the details for the different steps). On the other hand, I totally agree that some general knowledge & more information will be helpful to support better this project.
Based on my experience, I would like to suggest focusing the first works on the fabrication waterproof/resistant biopolymer films using as raw material some commercialized PLA grades. You will see that is not very easy to arrive to find the best alternative as Proof of Concept!
Good luck to you/your students in realization of this study,
Marius
PS: For eventual help:
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My biopolymer film is not sealing it is becoming chared or it is pealing out weather can I use any food grade glue to stick them
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Certainly it could be a possibility, alternatively adjust the temperature and decrease it, alternatively utilize ultrasonic welding.
Please keep me posted with your success.
Kind regards
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Interested in polymers that are soluble in small organic acids such as citric, etc. I know that citric acid is used as a cross-linking molecule for making biopolymers. But am interested in polymers that are soluble in 2C and 3C organic acids.
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One such pharmaceutically important polymer is chitosan
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For my thesis research, first, I mix PLA (solvent: chloroform/methanol) and PCL (solvent: chloroform/methanol) for 2-3 hours. After that, I want to mix PLA/PCL with PMMA (mW 350.000 solvent: ethyl acetate). How long does it take to mix PLA/PCL with PMMA perfectly? Thank you.
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Hi, different polymer blends may require different durations. However, such mixtures are usually made overnight (24 hours). You should be careful in choosing the solvent. Solvents must be compatible with each other.
You can review the research below.
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Natural gums such as Arabic gum have low molecular weights. However, they are available as natural products. Is it possible to add a chemical to form stable polymeric gums with a very high molecular weight just like Polyacrylamide that is used in EOR applications?
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Dear Sir,
Thank you very much . Can you guide me the procedure how can we cross link the xanthan gum with ferro chrome sulfate and Adipic acid .
Regards,
C. Paul jeyaseelan .
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Greetings! I have a research where I dissolve PLA in chloroform:methanol (3:1) for 3 hours and also PCL in chloroform:methanol (3:1) for 3 hours too. After that, I have to blend those two polimers together with magnetic stirrer. The question is, how long does it take to blend the solution of PLA and PCL with magnetic stirrer around 300 rpm? It would be better if you could refer your answer with journal. Thank you in any advance.
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Hi Evangelina,
I do not have a reference ready, but my first hand experience tells me that your two solutions should mix quite well in a short time. I would expect to obtain a homogeneous blend after 2 hours at 300 rpm. Just make sure to obtain a clear and transparent mixture: this assures you that the polymers are well dissolved and that you have one single phase.
Also, if you want proof that the blend is single-phase and stable, just mix for 2 hours and then stop, let rest for a few hours and check for any separation/precipitation.
Hope this helps,
Lukas
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Hello,
I made 2% xanthan gum solution and measured its viscosity while increasing temperature of the solution.
I guess viscosity of the solution should be decreased while heating, due to degradation of the polymer, according to the previous researches.
But I found that viscosity of my xanthan solution had increased continuously while heating and then suddenly dropped down quickly at 95'c.
Do you think it's normal to have the viscosity increasing while heating??? I want to know why it increases....
Please help! :"(
(+) I made the solution with 80'c water while stirring vigorously and homogenized for 15min at 5000rpm. So I assume all the dry xanthan powders were solublized enough.....
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It has been reported that xanthan in water undergoes a conformation transition when heated. At high T (and low ionic strength) it adopts the conformation of a disordered coil, at low T it adopts an ordered conformation (single or double helical, this is a matter of debate). Transition temperature Tm has been reported at 55 degree C (R.O. Mannion et al., Carbohydr. Polym. 19 (1992) 91-97). For the conformational transition, see E.R. Morris et al., J. Mol. Biol. 110 (1977), 1, and I.T. Norton, J. Mol. Biol. 175 (1984) 371. This may well be the cause for the phenomenon observed by you.
There is a rather vast literature on xanthan conformation, especially in what regimes random coil, single and/or double helical conformations prevail. As I am retired I have no access to this literature to advise you in more detail.
Because of these transitions, the preparation of xanthan solutions needs rigorous standardisation.
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Any recent research on biopolymers application in surface protection against miro & microorganism and algal deposition?
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I can suggest the recent work my group performed on chitosan:
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I am looking for a good book publisher for one of my book chapter related to biopolymer hydrogels having scientifically a broad scope and also a ISBN. If someone has experience in the same or related area or any general advise is more than welcome!
Thanks
M. Khan
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Fatty acids are known to act as building blocks for various biopolymer synthesis. Can we use microbial biodiesel for such purpose?
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Thank you all Karakka Kal Abdul Khader ,
Sullivan Lee
and Marwan Farhan
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I have synthesized Phthalated chitosan, now want to calculate its degree of substitution, is their any method available for calculating degree of substitution by UV spectrphotometry or Tirimetry????
Please help me out.....
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Possibly, this can be quantitatively done by 1H NMR, and can also be selectively quantified between N-substitution and O-substitution of chitosan. First, the structure of the phthalated chitosan needs to be confirmed through 1H, 13C, and 2D NMR.
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Biopolymers can bring in an environmentally benign approach to nanocomposites.
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PLA, PCL, starch, cellulose, chitosan and protein.
Please see the references below, you will find lots of interesting information:
JONG-WHAN RHIM, Natural Biopolymer-Based Nanocomposite Films for Packaging Applications. Critical Reviews in Food Science and Nutrition, 47:411–433 (2007). DOI: 10.1080/10408390600846366
Hernandez-Munoz, P. et al. 2003. Development and characterization of biodegradable films made from wheat gluten protein fractions. J. Agric. & Food Chem., 51:7647–7654.
Best Regards
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See question above, please.
Can I send the paper again ?
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Contact the editorial office.
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I want to coat keratin/chitosan hydrogel on titanium by using organosilane, APTES by silanation process. But there is no article for coating this biopolymers on titanium. So, does the reaction work by using APTES for keratin/chitosan hydrogel?
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Thank you for all information. But I also wanted to know whether after making keratin chitosan hydrogel, the blended hydrogel will react with glutaraldehyde or not. Do the keratin (thiol group) amino and carboxylic group can react with two different molecules or not. And even which source of chitosan is best for implantation?
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Additionally, I would like to use this polymer for 3d printing applications.
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You may consider methylcellulose-based hydrogels, whose LCST can be tuned by adjusting the polymer's concentration and the saline solution used to prepare the hydrogel (DOI 10.1007/s10856-016-5703-8). In our lab we successfully used these hydrogles for 3d printing and bioprinting applications (DOI 10.3390/ma11040579, DOI 10.1016/j.bprint.2018.e00024)
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Dear community,
I'm looking for Post-Doc position in :
-Metal nano-oxide synthesis ( eco-design and application in environment): examples: ZnO, TiO2.....
and/or
Nano-composites ( noble metal/ metal oxide for energy and health applications): examples: Ag/ZnO, Au/ZnO......
and/or
Reduced metallic nano particles for antibacterial activities
Thank you 
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Wishing you all the best with your search.
I would also suggest searching onthe following websites:
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I need a lot of PLGA for experiments without having to pay the steep price for medical PLGA.
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Ankur Shah how has been your experience with quality and purity of PLGA with SinoBiomaterials, I am planning to buy, wanted some reviews.
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We are currently conducting a research project on Natural Fiber reinforced biopolymer composites (green biocomposites) for food packaging application. 
Previously, we did an experts' survey on weight of  importance for 13 selection criteria to find the most suitable natural fiber. From that survey and by applying AHP Rating Mode method, we found that the top 5 ranking of criteria based on their importance are:
Rank            Criterion
1                   Raw Cost (10.6%)
2                   Tensile Strength (9.7%)
3                   Young's Modulus (8.8%)
4                   Availability (8.8%)
5                   Moisture Content (8.7%)
Now, we are to find the most suitable biopolymer matrix which are among starch biopolymer alternatives i.e rice starch, potato starch, wheat potato, corn starch etc. Therefore, we have identified 19 selection criteria. We really appreciate your feedback in assigning a weight of importance out of 7  score on  1 -  7 scale (1 being the "Not at all important", and 7 being "Extremely important") for each criterion in evaluating starch alternatives. 
Please click the link below to participate in the Experts' Survey: https://goo.gl/forms/K5bVs1Hq7KIgk0V72 All data collected will be used ONLY for this research. 
We hope to gather feedback from all experts by 9th of January 2019. Your feedback is very valuable and all your cooperation are highly appreciated.
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Thank you sir Dillip KUMAR Bisoyi for the answer.
Appreciate if you could answer the survey at: https://goo.gl/forms/K5bVs1Hq7KIgk0V72
Thank you.
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Well, we have extracted a new type of biopolymer. I need to measure the pI of it, but i do not have access to gel electrophoresis and cannot identify amino acid profile. I have access to a zeta sizer though. The biopolymers has surface active properties. It quickly adsorbs to the surface.
So would it be okay if i prepared emulsions stabilized with this biopolymer and measured the surface charge in different pHs and when zeta potential becomes 0, can it be reported as the pI?
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Could you be sure that the charge on the surface of the biopolymer, which contributes to the pI, was not involved in the interaction with particle surface?
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Hello,
Could you please tell me how much in terms of volumes of redox system (gycolic acid, potassium peroxymonosulphate, sulphuric acid) and monomer can I add to the reactor system containing 0,4g/l.
I intend to do graft copolymerization of a biopolymer I already have the various concentrations to optimize grafting but i dont know how much in terms of volume do I need to add,I I am very new in this field,
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youcan use sodium per sulfte or ceric ammonium nitrate solution1mlof 2percentage concentration
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Am preparing mixture of PEG + Tween 80 to make micro-spheres, but the problem is that i do not know the proper amount of both of them in grams.
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Better you do a preliminary test by performing some screening experiments in which you can gain better insight on how the process is going on.
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I'm a fresh graduate (B.Sc.) in civil engineering with GPA 4 out of 4, my graduation project topic was "Improvement of HPC using Biopolymeric Additives (Chitosan)" and I am already publishing a paper about it. I also worked on modification of equation for FRP tubes for estimated failure load in ACI for Circular columns, the problem is I cannot find anyone who is interested in both topics here in Egypt, and although the people abroad are interested in those two topics, but I cannot afford a Masters program abroad! any recommendations
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Dear Ibrahim Zidan,
You can check the websites of many international universities in your field.
Regards
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Hey,
I am looking for the complex refractive index of chitin from butterflies or any other arthropods in the range of 8 to 13 micrometers for an optical simulation. I could only find this data for wavelengths between 250 to 750nm.
Can someone recommend any sources, where I can find the complex refractive index?
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Dear Sreenatha,
that is true. Thank you for reminding me. I'll edit my question.
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I am looking for companies that sell polymers, and more specifically biopolymers, and/or chemicals that can ship to Canada (under a month or two for processing to delivery time) and who answer when request or emails are sent.
I have tried to contact many companies who have branded biopolymers, but most choose not to reply. I have to choose biopolymers for my research project, but I want to start focussing my research on biopolymers that are available and that are not too overpriced (under 200$ for 500grams). I don't need humongous amounts either, only between 10-20 kg.
Previously I've been reading articles and tried picking polymers from those, but most ended up where I send out emails to try and get materials, and nothing ever comes back.
Please help me!
Thanks
Céleste Robert
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Thank you for this website!
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I want to use cellulose in a synthesis but looking through manufacturer's websites to buy it , all i can find is Cellulose microcrystalline . as far as i know microcrystalline cellulose is partially depolymerized ,so i am not sure if i can use it in my synthesis. does anyone know if it makes a difference in the synthesis?
Thanks in advance
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Dear Fa Najafi ,
Sigma-Aldrich sells a variety of cellulose and they provide the spec sheets.
The University I go to as also bought cellulose from JRS, where they ofer different fiber lenght. For specifications you can contact them. their website is:
Hope this can help,
Céleste
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Can anybody suggest me an antimicrobial biopolymer, other than Chitosan, that shows antimicrobial activity?
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This question is i teresting for me
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Hello,
I need to make a cheap fuel cell membrane that is either highly selective to OH- or protons, but preferrably OH-. Also it should have almost no electrolyte crossover.
It would be best if the membrane was made out of a biopolymer, for example alginate or chitin, but it doesn't necessarily have to. Any suggestions, ideas or protocols to it?
Thanks very much,
regards,
André Leonhardt
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Thanks very much, no problem ;)
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Dear colleagues
I am interested in collaborating with some people in the research polymers groups, having small laboratory extruder to try to prepare a small amount of PLLA blends and PHB blends in the form of fiber (0.50 um-1 mm) to manufacture the surgical suture and study the orientation with different speeds. Do you have some people to help me with this research? Is there someone willing to work together with me on this research to manufacture fiber for manufacturing surgical suture and textile fiber in industry. After the process of manufacturing suture, it is possible to cooperate with researchers to implant these sutures in animals such as rabbits and rats and study the biocompatible in animal and too the bio absorption with animal body.
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Well, I have a very small extruder for nanocomposite which will be installed next month. We did lot of work on PLA as you can search from the wesbite by goggling my name. I have a complete lab for the characterization and even to study microbial part of the work. If you feel we can collaborate.
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I'm fabricating membranes from carbohydrate biopolymers like alginate and chitosan. However, membranes produced from carbohydrates are crisp and brittle, which necessitates the use of plasticizer. A paper I read used PEG for chitosan. I'm wondering if PEI can be used instead, as there are properties of PEI that I also want to incorporate in the membrane. Thanks!
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PEI might have some plasticizing effect. Remember that in water it will exist with some of the amines protonated as a cationic polymer. With Alginate this will likely cause gelling. The polycationic nature may have other deleterious effects.
Another alternative is poly ethyl oxazoline - like PEG it is water soluble and uncharged (neutral)
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Dear Researchers, How we can calculate the binding affinity between the anticancer drug and biopolymer nanoparticles?
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. I hope my answers can help your project
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We want intercalated the biopolymer chitosan in a layered silicate material at different pH
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The isoelectric point (IEP) of chitosan can be expected within 7―9.
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Hi, I am currently using cohesive elements to model a bio polymer material. my material is undergoing negative displacements hence i want to superimpose my cohesive elements with another compression cohesive law so that when the displacements reach a negative value the second cohesive law will prevent that.
But now how to superimpose the compression cohesive law when the negative displacement criteria is reached?. Thanks in advance
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Hi Arunachalam Muthukaruppan ,
Using a cohesive UEL can help you. If you don't want to develop by yourself, I can recommend the PPR potential model by K. Park and G.H. Paulino. The script is available in web. In the script, at the beginning of 'k_Cohesive_PPR' subroutine, you can arbitrarily define the traction for negative (or a limit) displacement. If you put some time to read the following article and watch following simple instruction videos on implementation, it should be straightforward. This model has good convergence and is very good to capture mixed mode failure.
Video instruction:
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During electrospining, It is shown that the solution doesn't electrospin, it is sprayed...
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