- Mauricio J Pardo added an answer:Does anyone have experience with Spray Drying : Ginger?
Old( harvested before) ginger solution (with water) gives fine powder after spray dying but the recently harvested Ginger solution does not give powder. Why?
I agree with Ms Aishah Bujang. You should measure the solid content of the ginger extract and try adding Maltodextrin in the same proportion (ie one gram of maltodextrin per gram of solids in your sample).Following
- S. Sadeghzadeh added an answer:What is the usual methods for granulating the silica gel in industry?
I know that some methods such as oil-drop and spray drying may be used in industry to granulate the silica gel. I want to know which method is used really in industries?
Thank you very much Elena.
That's very good. Do you know any about the "air granulation" mentioned there?Following
- Shi Yiing Tang added an answer:Can anyone help me to check this protocol for probiotic microencapsulation?
I did the experiment a number of times buy am still not able to obtain the expected result. I would like to seek help from everyone. The protocol as follows:
1. Dissolve 1%maltodextrin and 1%CMC (carboxymethyl cellulose) separately in sterile distilled water.
2. Centrifuge probiotic culture and wash with PBS.
3. Dissolve pellet with 1% maltodextrin and follow by CMC, stir using magnetic stirrer for 5 minutes.
4. Perform acidity test for the mixture.
Result obtained: survivability of control sample is higher than malto+CMC encapsulated sample at pH1.5 for 90min.
May I know which step went wrong? Or, is it a MUST to perform spray drying process in order to obtained the encapsulated cells?
Thanks for all the suggestions. Do you think spray dry process must be perform to complete the microencapsulation? I meant, do you think the cells will be better encapsulate if perform spray drying after mix with the encapsulated agents? ThanksFollowing
- Haris Amir asked a question:Does anyone know, what are the recent developments in modelling spray drying?
Does anyone know, what are the recent developments in modelling spray drying?Following
- Xianqian Zhu added an answer:How can I form a stable emulsion of fish roe that can be spray dried?
I have tried solubilizing the fish roe in dilute salt solutions. But that still forms 2 separate layers. How do I form a stable emulsion?
Try colloid mill to make the particle size smallerFollowing
- Natasha Nayak added an answer:What is the effect of inlet air temperature on the morphology of powder particles using protein as a carrier?I am using protein as carrier in spray drying of juice powder.
I am not sure whether protein can be used as a carrier. Usually, its the other way around. That is protein is spray dried along with carriers like sucrose, trehalose. This is done to prevent agglomeration/unfolding of the protein and to increase its storage stability.
You can try using maltodextrin with or without the protein powder to spray dry the juice.
Since your formulation is something I've never worked with cant really comment on its morphology of the powder, that can be only found out using SEM.Following
- Ehsan Oskoueian added an answer:What are the economic, easy and novel techniques to harvest the microbial mass from media in industry?
Freeze-drying and centrifuging are expensive techniques, spray drying has its own challenges and I guess the ultrafiltration might be challenging as well. Is there any other option?
Dear Istvan Balogh
I got the point. Thank you for the helpful information.Following
- Matthias Steiert added an answer:I am looking for possible methods of drying drug loaded nanoparticles (polymeric nanoparticles) apart from freeze drying. Can someone suggest?
There are very few methods in literature for drying nanoparticles - mostly freeze drying is used, few others are spray drying, oven drying, evaporation etc. However, these often lead to agglomeration/change in size and also in some cases properties. I am interested in a simple and effective method of drying.
Spray drying might be another option. This link is just to get your started looking into it http://en.wikipedia.org/wiki/Nano_spray_dryerFollowing
- Carlos Alberto Fuenmayor added an answer:Newbie here: How to determine Encapsulation Efficiency of an encapsulated hydrophobic antioxidantI am thinking of encapsulating a hydrophobic antioxidant (lets call it A) using a spray dryer.
Since it is hydrophobic, i was thinking of dissolving A with a vegetable oil, maltodextrin as a wall material and gum arabic as surfactants in water. This emulsion is then spray dried.
However, I am not too sure how to determine encapsulation efficiency. Any advice?
*sadly i do not process a spray dryer capable of handling solvent.
Sure there are other ways. You can check which is a good solvent for your compound (ethanol, methanol, usually work well for hydrophobic phenolics, but I don't know the entity of "A").
First of all you have to extract A from the encapsulating matrix. You can try to do it directly in the solvent, however maltodextrin can be tough to release its cargo when it is dispersed in a non polar solvent. One possibility to tackle this is to grind the capsules very well prior to the extraction and to do the extraction for a long period.
Consider also where would you want A to be released (if you encapsulate it, I guess you want to release at some point). In that case what you can do is to perform release experiments in the medium that your are interested, i.e., water at a certain pH (no matter if it is acqueous phase, aftwerwards it has to be released there) and then measure how much is actually released to that medium. At some point there will be equilibrium, and the maximum amount that is released can be considered for calculating and "Effective Efficiency Ratio". Meaning that even if you have more compound encapsulated inside, it won't be released, so you can consider it "lost".
If you really want to calculate how much is encapsulated, though, the most accurate thing to do is thermogravimetric analysis (TGA). You can read further about it, there is plenty of information online and probably someone in your university has one TGA instrument (Chemistry or Chemical Engineering Departments usually do).
Remember you are encapsulating an antioxidant, so instead of measuring the concentration (for example with chromatography), you can use the classical Folin, DPPH, ABTS or any other simple in-vitro antioxidant capacity test!
Now good luck with your experiments!!Following
- Nabajyoti Biswas added an answer:How to dry a sample solution?I have a solution of protein hydrolysate and I want to dry the solution without changing the peptide activity. Freeze drying unit isn't working and I need another method of drying the sample. Can I use a spray drier? What will be the protocol.Amit Taneja
Spreay drying is of course a good option but whether in that high temperature the peptide activity remain same? I know that peptides are stable compounds only but not sure whether its activities reman stable too?Following
- Olivia Ho added an answer:Can someone help me with my surfactants questions?So I've just started looking at surfactants, emulsions etc.
I've been looking at some journals on emulsion/dispersion for spray drying etc. and all, but without much success.
Let's say I want to create an O/W emulsion (wherein a hydrophobic substance in an aqueous phase contains maltodextrin).
What I am not sure about is:
1) Some papers just use 1 surfactant like Tween 80; whereas some use 2 or more surfactants. For O/W, must I use 2 surfactants or is just 1 kind enough? I see HLB values being mention for emulsion. So how come some just use 1 surfactant?
2) Where do I dissolve the surfactant for O/W? For example, Tween 80 and Span 20.
Is it all in water? Or is Tween in the oil phase and Span in water phase? Or is it only after dissolving maltodextrin in water or before dissolving maltodextrin?
Are there specific steps I should follow?
I've been googling but I can't really get any answers. Sorry for the stupid questions.Thanks guys for the input!
Will try out in the labFollowing
- Jeffrey G. Tait added an answer:Does anyone know of an aerosol device able to spray small quantities of liquid nano-microlitres?We would like to apply small quantities of liquid as an aerosol to specific objects.Along with Emanuele, our group uses ultrasonic spray coating for a multitude of materials and solvent systems. Another option you may consider if the Aerosol Jet system from Optomec. These operate with either ultrasonic atomization or pneumatic, and print lines on the order of 10um wide with a precise deposition control system for the volumes you are looking at.Following
- Jeffrey G. Tait added an answer:Can anyone shed some light on how to go about doing a co-current spray dryer design to manufacture detergents?The spray dryer is using a pressure nozzle.Depending on your design requirements, and if you are considering ultrasonic atomization, I have successfully used concurrently pumped nozzles from Sono-tek. With some design alterations it is possible to control the exact solution meeting point within the horn, or at the nozzle tip. I have used these nozzles for spraying a variety of different surface tension and viscosity inks in the field of organic photovoltaics.Following
- Closed account added an answer:Which is best to use, Tween 20 and Tween 80?I'm wondering if its possible to use Tween 20/80 as a carrier/solubilizer to dissolve a hydrophobic substance. So far, I tried heating either Tween to around 70C, and it manage to dissolve my hydrophobic substances. But when I remove it from the heat plate, it starts to turn into like white solid like ghee, which I guess happens because of the decrease in temperature to the cloud point?
I'm trying to understand the differences in both Tween. I read somewhere that tween 20 is better to emulsify small amounts of lighter oils; whereas Tween 80 to emulsify larger amounts of heavier oil.
Then I check the HLB value (wikipedia) in which:
12 to 15: detergent
12 to 16: O/W (oil in water) emulsifier
16 to 20: solubiliser or hydrotrope
Tween 20 (16.7) seems like a better choice as it can act as a solubiliser or O/W emulsifier compare to Tween 80. But then other sources said tween 80 is better to emulsify larger amount of heavier oil?Which sounds like its better to solubilised my hydrophobic substances.
Erm. Do correct me if I'm wrong.
Appreciated.In order to use either tween 20 or 80 y have to look for pH of te midium each one works in different situation pH, type of oil, amount of olis.......etcFollowing
- Elias Baghdan asked a question:What is the best fluorophore for the labeling of a spray dried chitosan?In my lab work, I dissolve Chitosan in 1% acetic acid to be applied in spray drying.
For the characterization of the spray dried product (Chitosan Acetate), I need to label the chitosan with suitable fluorophore. That means this fluorophore should work in acidic medium and is convenient for spray drying application.Following
- Steva Levic added an answer:What is the most suitable solution for bacterial cell release after spray drying immobilization?I am working with alginate and chitosan immobilization of bacterial cells. I am experiencing some difficulties in the assessment of the process yield, in what concerns to determining the viable number of cells after spray drying. I am now resuspending the spray dried product in NaCl 0,85% and make successive dilutions for spreading. However, after 24h, few cells have been released.1. Alginate should be soluble even in water (without NaCl). But in this case NaCl is necessary for bacterial cell osmotic stability.
2. Chitosan is soluble in diluted acids (HCl or acetic acid).
3. Do you see any visual changes in your suspension upon addition to NaCl solution? Are particles completely disintegrated. If not, try with magnetic stirrer to break particles.
4. Are you used proven protocol for spray drying of bacterial cells? Conditions during spray drying are critical for cells viability.Following
- Ravi Kant Upadhyay added an answer:Anyone an expert on Antioxidant Assay (ABTS)?I'm a total newbie on antioxidant assay. Trying to determine antioxidant activity of an encapsulated polyphenolic compound
So I was looking at some journals for ABTS Assay procedures, and got quite confused as below:
This is the confusion part for me:
For (1), 7mM ABTS solution mixed with K2S2O8 solution. In that mixture, the concentration of K2S2O8 is 2.45mM.
Whereas for (2) equal amount of 7mM ABTS solution is mixed 2.45mM K2S2O8 solution. Doesnt that mean the final concentration of K2S2O8 in that mixture is 1.225mM.
Is (2) correct. Are they trying to get final concentration of 1.225mM. Or am I reading it incorrectly?
Methods of assessing antioxidant behaviour fall into two broad categories reflecting the focus on activity in foods or bioactivity in humans. In the case of food systems, the need is to assess the efficacy of an antioxidant(s) in providing protection for the food7 against oxidative spoilage. A sub category involves measurement of activity in foods, particularlyfruits, vegetables and beverages, but with a view to predicting dietary burden and in vivo activity. Reference is Antioxidant capacity of reaction products limits the applicability of the Trolox Equivalent Antioxidant Capacity (TEAC) assay. Mariken J T J Arts, Guido R M M Haenen, Hans-Peter Voss, Aalt BastFollowing
- Oleg Gusev added an answer:What is the main difference between gram-negative and gram-positive bacteria in relation to desiccation tolerance?I would like to make a comparison between gram-negative and gram-positive bacteria in relation to desiccation tolerance.Oh, interesting, is the Mn(II) story is taking place in the taxa other than Deinococcus ?Following
- Stephen Warren added an answer:Has anyone (else) used dry-spraying of a nitric acid solution to obtain gas-phase nitric acid?We used it for generating the highly adsorptive nitric acid vapor as an alternative for the permeation tube (discussed by Karl Cammann in these topics).
It is briefly described in
Artefacts in the sampling of nitrate studied in the “INTERCOMP” campaigns of EUROTRAC-AEROSOL
M. Schaap et al
Atmospheric Environment. 12/2004; 38(38):6487-6496Harry - I was director of the environment lab for the UK water authorities from 1980 -1987. Acid rain was a minor problem for them and we avoided it because it was a crowded field already. in 1982 I was asked to chair a government committee because the state electric power company was at war with the state-funded environment laboratories. My job was to keep the peace while we produced a report. I was a neutral with a background that meant I could pick up the science as we went along. We finished in 1984 and I left the subject then but had learned a lot and not all to do with acid rain! I left the water research centre in 1992 after the govt privatised the water authorities and spent the next 18 years working as a consultant in former communist countries, on EU, WB, or nationally funded projects.Following
- Katerina Simkova added an answer:Unstable spray in spray drying - can anyone help?Can someone please share some thoughts on why do I get an unstable spray in spray drying? The spray is pulsating (looks like it is spitting). It does not matter what kind of solvent/solution/suspension/emulsion I am feeding, the result is always the same. The system is Büchi P-290.Hello Alen, so we had our spray dryer checked last week and it seems that it helped (but I didn't try so far anything else than water). We had problem with the most inner part of the nozzle and with the cap that you put on as first when you assemle the whole nozzle. Thus the nozzle's inner part was not symetrically positioned in the cap where it comes into conntact with the atomizing gas. Regards, KaterinaFollowing
- Michele Bonus added an answer:Is mannitol soluble in acetone?I have checked online and of course I found information that it is soluble. But dissolving mannitol in distilled water and injecting it into a beaker containing acetone produced precipitates of mannitol. So please is mannitol really soluble in acetone?Following