Lan Shen

Shanghai University of Traditional Chinese Medicine, Shanghai, Shanghai Shi, China

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Publications (46)63.43 Total impact

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    ABSTRACT: Although PEGylation plays an important role in drug delivery, knowledge about the distribution behavior of PEGylated drugs in ischemic myocardia is rather limited compared to nanoparticles. This work therefore aims to characterize the targeting behavior of the anti-myocardial ischemic mono-PEGylated conjugates of Radix Ophiopogonis polysaccharide (ROP) in two clinically relevant animal models, ie, the myocardial infarction (MI) model and the ischemia/reperfusion (IR) model. To determine the effect of the molecular size of conjugates, two representative conjugates (20- and 40-kDa polyethylene glycol mono-modified ROPs), with hydrodynamic size being approximately and somewhat beyond 10 nm, respectively, were studied in parallel at three time points postdose after a method for determining them quantitatively in biosamples was established. The results showed that the cardiac distribution of the two conjugates was significantly enhanced in both MI and IR rats due to the enhanced permeability and retention effect induced by ischemia. In general, the cardiac targeting efficacy of the conjugates in MI and IR rats was approximately 2; however, different changing in targeting efficacy with time was observed between MI and IR rats and also between the conjugates. Although the enhanced permeability and retention effect-based targeting efficacy for mono-PEGylated ROPs was not high, they, as dissolved macromolecules, are prone to diffusion in the cardiac interstitium space, and thus, facilitate the drug to reach perfusion-deficient and nonperfused areas. These findings are helpful in choosing the cardiac targeting strategy.
    International Journal of Nanomedicine 01/2015; 10:409-18. DOI:10.2147/IJN.S73462 · 4.20 Impact Factor
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    ABSTRACT: The two herbs Ligusticum chuanxiong (LC) Hort. (Umbelliferae) and Gastrodia elata (GE) Blume (Orchidaceae), are widely used in the clinic for the treatment of migraine. This article aims to understand the effects of LC and GE on blood-brain barrier (BBB) permeability in migraine rats. Serotonin, excitatory amino acids (EAAs) and matrix metalloproteinase-9 (MMP-9) were determined at different sampling times to assess BBB disruption during a migraine attack. BBB permeability was examined by fluorescence imaging and Evans blue dye (EBD) extravasation. The results showed that the expression of serotonin in migraine rat brain was enhanced from 30 min to 120 min and glutamate (Glu) was suppressed from 30 min to 60 min in LC-GE group compared with the model group (p p p Document Type: Research Article DOI: http://dx.doi.org/10.1691/ph.2015.4852 Publication date: June 1, 2015 More about this publication? Pharmazie is one of the world's leading pharmaceutical journals. As a peer-reviewed scientific journal, DiePharmazie is regularly indexed in Current Contents/Life Sciences, Excerpta Medica, Analytical Abstracts, International Pharmaceutical Abstracts, Beilstein Current Facts in Chemistry, Chemical Engineering and Biotechnology Abstracts (CEABA) and Science Citation Index. Information for Authors Submit a Paper Subscribe to this Title Terms & Conditions ingentaconnect is not responsible for the content or availability of external websites $(document).ready(function() { var shortdescription = $(".originaldescription").text().replace(/\\&/g, '&').replace(/\\, '<').replace(/\\>/g, '>').replace(/\\t/g, ' ').replace(/\\n/g, ''); if (shortdescription.length > 350){ shortdescription = "" + shortdescription.substring(0,250) + "... more"; } $(".descriptionitem").prepend(shortdescription); $(".shortdescription a").click(function() { $(".shortdescription").hide(); $(".originaldescription").slideDown(); return false; }); }); govi/pharmaz/2015/00000070/00000006/art00012 dcterms_title,dcterms_description,pub_keyword 6 5 20 40 5 GA_googleFillSlot("Horizontal_banner_bottom");
    Pharmazie 01/2015; 70(6). DOI:10.1691/ph.2015.4852 · 1.00 Impact Factor
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    ABSTRACT: Co-processed excipients withgelatinized or non-gelatinized starch were prepared by spray drying. Powder and tablet properties of corocessed excipients prepared were compared with those of physical mixtures and spray-dried lactose. Their applicability in traditional Chinese medicine (TCM) powder tableting was tested on two TCM extracts, i.e., the gardenia extract and the Herba Sedi extract. It was shown that gelatinizing starch before co-spray drying with lactose could improve the performance and efficiency of starch as a binder, resulting in remarkable improvement in physicomechanical properties of co-processed excipients prepared. Conpared to self-made and commercially available spray-dried lactose, co-processed excipients achieved better compactability and higher drug loading for TCM extracts. In conclusion, the lactose-gelatinized starch co-processed excipient, with excellent physicomechanical properties, is promising to be explored as a new excipient for direct tableting.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 11/2014; 39(22):4329-34.
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    ABSTRACT: In the area of injectable long-acting formulations, the in situ forming system (ISFS) is an attractive alternative for its various superiorities. In this study, both hydrophilic and hydrophobic in situ forming systems, using Poloxamer and sucrose acetate isobutyrate (SAIB) or poly(D,L-lactide-co-glycolide) copolymer (PLGA) as carrier, respectively, were investigated for Radix Ophiopogonis polysaccharide (ROP), a natural anti-myocardial ischemic fructan. A reasonable and applicable range of formulations were selected from each carrier for in vivo study by investigating their rheological property. The results from in vivo evaluation show that relatively promising sustained behaviors were achieved by formulations 24% P407/10% P188, 40% PLGA30k/NMP, and 30% PLGA50k/NMP. Significant differences of drug release kinetics were observed between in situ thermally-induced Poloxamer-based hydrogels and in situ solvent exchange-induced hydrophobic PLGA depots. This suggests that different ISFS could be chosen to provide different application purpose for polysaccharide drugs. In the case of ROP, Poloxamer-based ISFS is promising for short-term acute therapies; however, PLGA-based ISFS might be promising for long-term precaution or/and cure of myocardial ischemia.
    International Journal of Biological Macromolecules 09/2014; 72. DOI:10.1016/j.ijbiomac.2014.09.009 · 3.10 Impact Factor
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    ABSTRACT: Traditional processes are mostly adopted in traditional Chinese medicine (TCM) preparation production and the quality of products is mostly controlled by terminal. Potential problems of the production in the process are unpredictable and is relied on experience in most cases. Therefore, it is hard to find the key points affecting the preparation process and quality control. A pattern of research and development of traditional Chinese medicine preparation process based on the idea of Quality by Design (QbD) was proposed after introducing the latest research achievement. Basic theories of micromeritics and rheology were used to characterize the physical property of TCM raw material. TCM preparation process was designed in a more scientific and rational way by studying the correlation among enhancing physical property of raw material, preparation process and product quality of preparation. So factors affecting the quality of TCM production would be found out and problems that might occur in the pilot process could be predicted. It would be a foundation for the R&D and production of TCM preparation as well as support for the "process control" of TCMIs gradually realized in the future.
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    ABSTRACT: To evaluate in vivo pharmacokinetics of Ophiopogonis Radix polysaccharide MDG-1 oily suspension injection prepared with different prescriptions in rats, and explore the feasibility of the long-acting drug delivery of MDG-1 Injection by using the oily suspension drug release system.
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    ABSTRACT: Abstract This study is aimed to investigate the applicability of poloxamer 407 (P407) and 188 (P188)-based temperature-sensitive in situ hydrogel (TSHG) in sustained delivery of hydrophilic macromolecules following intramuscular administration. Polyethylene glycols (PEGs) with molecular weight of 5-, 20-, and 40-kDa were used as model drugs, which can represent the common size range of hydrophilic macromolecular drugs using TSHG. The correlation between the level of poloxamers and thermogelling transition temperatures (Tsol-gel) was established and two formulations "20% P407/10% P188" and "24% P407/10% P188" were chosen for further study. The results showed that the release kinetics of PEGs was close to zero order. Sustained in vivo behaviors were achieved by both of the two formulations for all the PEGs though variations were seen. Lower molecular weight PEG showed more remarkable pharmacokinetic improvements. No significant differences in pharmacokinetics were observed between the two formulations for the same PEG. This suggested that 20-24% P407/10% P188 formulations, with accordingly Tsol-gel in the range of 24.6 °C-31.7 °C, might be freely chosen to achieve comparable pharmacokinetics for hydrophilic macromolecular drugs after intramuscular injection.
    Drug Delivery 03/2014; 22(3). DOI:10.3109/10717544.2014.891272 · 2.20 Impact Factor
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    ABSTRACT: The quantitative characterization and evaluation of the synchrony of multi-component release behavior are bottlenecks which urgently need to be solved in the study of multi-component release kinetics and the quality control of multi-component traditional Chinese medicine (MCTCM). MCTCM is made using original prescriptions and preparations. At present, MCTCM is generally evaluated using pharmacodynamics evaluation. However, this method lacks convenience and cannot clearly reveal the correlation between the whole dynamic process of drug release and in vivo absorption. It is also very limited by the preparation of MCTCM. In addition, there are various types of effective ingredients in MCTCM, which show distinctly different physicochemical properties. These differences may lead to the asynchrony of drug release between MCTCM and the original preparation, which thereby directly affects the efficacy. However, we can't find the core reason for this issue through the use of pharmacodynamics evaluation. The papers reported previously were confined to studying the release characteristics of one or a few components in MCTCM and the drug release evaluation method reported was too macroscopic to specifically identify the components which caused the integral asynchrony. In this paper, in order to reveal the MCTCM release synchronous characteristics, Fuzhenghuayu capsules were selected as the model, an original preparation used, and the integral release evaluation method based on a mathematics set was established in guiding the preparation of MCTCM. This method can not only be used in evaluating the release characteristics of MCTCM by the parameter of the asynchronous coefficient, but can also be used in adjusting the dose of the release unit by the relative error parameter. The results demonstrated that this evaluation method was feasible, stable and reproducible. Also the Fuzhenghuayu pellets guided by this method showed release synchrony and similar pharmacodynamics with the original capsules, and the drug release mechanism was mainly frame erosion. Through this study, we could then evaluate the quantifiable release characteristics of MCTCM and apply an integral synchronous evaluation method for MCTCM.
    Analytical methods 01/2014; 6(7):2260-2269. DOI:10.1039/c3ay41850b · 1.94 Impact Factor
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    ABSTRACT: Metabolic disorders such as hyperglycemia, dislipidemia, and insulin resistance often occur in obese populations long before the manifestation of type 2 diabetes mellitus (T2DM), cardiovascular disease, and cancer. The prevention of metabolic disorders in obese individuals might decrease the morbidity of diabetes and other metabolic diseases. Ophiopogon japonicus is a traditional Chinese medicine used for thousands of years to treat patients with diabetes. We showed in previous work that MDG-1, a polysaccharide extracted from Ophiopogon japonicus, could treat T2DM. To investigate whether MDG-1 can prevent metabolic disorders, metabonomic methods, together with multivariate analysis, were used to evaluate the role of MDG-1 in the prevention of metabolic disorders in a high-fat, diet-induced obesity (DIO) model. Thirty-six male C57BL/6 mice (8 weeks old) were randomly divided into a control group (normal chow), a model group (high-fat chow), and an MDG-1 group (high-fat chow dosed with 300 mg kg−1 MDG-1). After 16 weeks of treatment, urinary metabonomic studies were performed using ultra-performance liquid chromatography-time of flight mass spectrometry in combination with multivariate statistical analysis. Indices of body weight, food intake, fasting and fed blood glucose, oral glucose tolerance test (OGTT), and OGTT plasma insulin were collected. MDG-1 treatment was shown to exert mild ameliorative effects on bodyweight gain, fed blood glucose levels, OGTT, and the insulin resistance of DIO mice. In addition, 21 potential biomarkers of glucose, fatty acid, phospholipid and amino acid metabolism, the tricarboxylic acid cycle and purine metabolism were identified. Based on these compounds, it is suggested that MDG-1 could reduce glucose, the glucose-related products lactic acid and N-acetyl-D-glucosamine, and lipids, thus normalizing tricarboxylic acid cycle activity while decreasing purine, hence alleviating oxidative stress in DIO mice. Although there was no obvious alteration in visible biomedical indices, invisible metabolic disturbances did occur with MDG-1 supplementation, which may lead to the possible elucidation of the action of MDG-1 against metabolic disorders.
    Analytical methods 01/2014; 6(12):4171. DOI:10.1039/c4ay00796d · 1.94 Impact Factor
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    ABSTRACT: Radix Ophiopogonis polysaccharide (ROP), a highly hydrophilic macromolecule, has a unique anti-ischemic action in the myocardium. One of the main problems with its use is its relatively short half-life in vivo. To solve this problem, injectable long-acting drug delivery systems, which combine mono-PEGylation (PEG, polyethylene glycol) with the in situ formation of poly(d,l-lactide-co-glycolide) copolymer (PLGA) depots, were tested in this study. Through a moderate coupling reaction between 20 kDa amino-terminated methoxy-PEG and excessive ROP with activated hydroxyls, a long-circulating and bioactive mono-PEGylated ROP was prepared and characterized. A reasonable and applicable range of PLGA formulations loaded with the mono-PEGylated ROP were prepared, characterized, and evaluated in vivo. Relative to ROP, the half-life of which was only 0.5 hours, the conjugate alone, following subcutaneous administration, showed markedly prolonged retention in the systemic circulation, with a mean residence time in vivo of approximately 2.76 days. In combination with in situ-forming PLGA depots, the residence time of the conjugate in vivo was prolonged further. In particular, a long-lasting and steady plasma exposure for nearly a month was achieved by the formulation comprising 40% 30 kDa PLGA in N-methyl-2-pyrrolidone. Long-lasting and steady drug exposure could be achieved using mono-PEGylation in combination with in situ formation of PLGA depots. Such a combination with ROP would be promising for long-term prophylaxis and/or treatment of myocardial ischemia. For high-dose and highly hydrophilic macromolecular drugs like ROP, more than one preparation technology might be needed to achieve week-long or month-long delivery per dosing.
    International Journal of Nanomedicine 01/2014; 9:5555-63. DOI:10.2147/IJN.S71819 · 4.20 Impact Factor
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    ABSTRACT: Type 2 Diabetes Mellitus (T2DM) is a chronic metabolic disorder with systemic complications and has been a worldwide epidemic. Ophiopogon japonicus is a traditional Chinese medicine used to treat diabetes for thousands of years. From our previous work, we know that MDG-1, a water-soluble β-d-fructan polysaccharide from O. japonicas could treat T2DM experimentally. However, MDG-1 is poorly absorbed and its mechanism of action is still unknown. Therefore, a GC TOF/MS-based metabonomic approach in combination with multivariate statistical analysis was performed to investigate the mechanism of MDG-1 in a spontaneous diabetic model. Female diabetic KKay mice (21 weeks old) were randomly divided into a diabetic group (n = 6, gavaged with distilled water) and a MDG-1-Diabetic group (n = 7, gavaged with MDG-1, 300 mg kg(-1)) and female C57BL/6 mice (21 weeks old) were set as controls (n = 6, gavaged with distilled water). After 8-weeks of treatment, feces samples were collected for GC-TOF/MS analysis. Consequently, 12 potential biomarkers were identified, including monosugars (d-tagatose, d-lyxose, d-erythrose, xylo-hexos-5-ulose, 2-deoxy-galactose), butanedioic acid, amino acids (phenylalanine, l-lysine, l-methionine, l-aspartic acid) and purine derivatives (7H-purine, 2'-deoxyinosine). We assume the monosugars and butanedioic acid were the fermentation products of MDG-1 by intestinal microbes and MDG-1 actions against diabetes might be accomplished through the absorbable monosugars and butanedioic acid via suppressing intestinal glucose absorption, enhancing liver glycogenesis, inhibiting glycogenolysis and promoting GLP-1 secretion. Besides, MDG-1 might alleviate diabetes and diabetic nephropathy by reducing 7H-purine and 2'-deoxyinosine. Further omics-driven studies including genomics, proteomics and metabonomics were considered to be carried out to provide direct evidence of gut microbiome contribution to MDG-1 actions.
    Molecular BioSystems 11/2013; 10(2). DOI:10.1039/c3mb70392d · 3.18 Impact Factor
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    ABSTRACT: Breviscapine, one of cardiovascular drugs extracted from a Chinese herb Erigeron breviscapinus, has been frequently used to treat cardiovascular diseases such as hypertension, angina pectoris, coronary heart disease and stroke. However, its poor water solubility and low bioavailability in vivo severely restrict the clinical application. To overcome these drawbacks, breviscapine solid dispersion tablets consisting of breviscapine, polyvinylpyrrolidone K30 (PVP K30), microcrystalline cellulose and crospovidone were appropriately prepared. In vitro dissolution profiles showed that breviscapine released percentage of solid dispersion tablets reached 90 %, whereas it was only 40 % for commercial breviscapine tablets. Comparative pharmacokinetic study between solid dispersion tablets and commercial products was investigated on the normal beagle dogs after oral administration. Results showed that the bioavailability of breviscapine was greatly increased by 3.45-fold for solid dispersion tablets. The greatly improved dissolution rate and bioavailability might be attributed to intermolecular hydrogen bonding reactions between PVP K30 and scutellarin. These findings suggest that our solid dispersion tablets can greatly improve the bioavailability as well as the dissolution rate of breviscapine.
    European Journal of Drug Metabolism and Pharmacokinetics 09/2013; 39(3). DOI:10.1007/s13318-013-0150-0 · 1.31 Impact Factor
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    ABSTRACT: Preparative HPLC was used to prepare ferulic acid, senkyunolide I and senkyunolide H from Ligusticum chuanxiong. The separation was conducted on a Shim-Pack Prep-ODS (20.0 mm x 250 mm, 5 microm) column with the mobile phase of methanol-0.2% glacial acetic acid (50:50)at the flow rate of 5 mL x min(-1). The detection wavelength was 278 nm, and the purity of each compound was detected by HPLC analysis. Spectral data analyses including UV, ESI-MS and NMR were used to identify their structures. This method is simple, fast, which is suitable for preparation of standard reference of ferulic acid, senkyunolide I and senkyunolide H from L. chuanxiong and can meet the requirement of new drug research and development.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 06/2013; 38(12):1947-50.
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    ABSTRACT: This work aimed to improve the clinical application of Radix Ophiopogonis polysaccharide (ROP), a natural anti-myocardial ischemic fructan with Mw of 4.80 kDa, by mono-PEGylation. Three mono-PEGylated ROPs were prepared by a moderate coupling reaction between amino-terminated methoxy-PEG (20-, 30-, or 40-kDa) and excessive hydroxyl-activated ROP. After being fully characterized by proton nuclear magnetic resonance as well as high-performance gel permeation chromatography and anthrone-sulfuric acid colorimetry coupled assay, they were evaluated for pharmacokinetics and anti-myocardial ischemic activities in rats with coronary artery ligation. The results showed that mono-PEGylated ROPs were successfully and effectively prepared. Compared with ROP, the three mono-PEGylated ROPs showed approximately 32-, 85-, and 100-fold prolonged retention in systemic circulation with plasma half-lives reaching 16.1, 42.4, and 49.8 h, respectively. Studies on anti-myocardial ischemic effects of the conjugates showed that administrated at the same molar dose of 4 μmol/kg per injection as ROP, they could achieve comparable or even better therapeutic effects although their administration intervals were 2- to 6-fold longer than that of ROP. These findings confirm that PEGylation would be a promising approach to markedly reducing the injection-administered frequency of ROP and hence patient compliance without sacrifice of the therapeutic efficacy by significantly improving its pharmacokinetics.
    European journal of pharmaceutical sciences: official journal of the European Federation for Pharmaceutical Sciences 05/2013; 49(4). DOI:10.1016/j.ejps.2013.05.020 · 3.01 Impact Factor
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    ABSTRACT: Ligusticum chuanxiong Hort. (Umbelliferae) has been widely prescribed to treat cardiovascular disease in China for centuries. Senkyunolide I is one of the major bioactive components in L. chuanxiong, which shows pharmacological activities against migraines and oxidative damage. In this paper, ultra performance liquid chromatography/quadrupole-time-of-flight tandem mass spectrometry (UPLC/Q-TOF-MS) was applied for the rapid analysis of senkyunolide I metabolites in rats after its intravenous administration. The non-metabolized parent compound and eighteen metabolites from drug-treated samples in rat plasma, urine and bile were identified. Our analysis indicated that methylation, hydration, epoxidation, glucuronidation and glutathione conjugation were the major pathways of senkyunolide I metabolism in vivo. This study provides important information regarding the metabolism of senkyunolide I, which will be helpful for understanding its mechanism of action. Furthermore, this work demonstrates the potential of using UPLC/Q-TOF-MS for the rapid and reliable characterization of the metabolites of natural products.
    Journal of pharmaceutical and biomedical analysis 04/2013; 81-82C:178-186. DOI:10.1016/j.jpba.2013.04.012 · 2.83 Impact Factor
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    ABSTRACT: A combinative method using HPLC fingerprinting and quantitative analysis was developed and validated for manufacturer-to-manufacturer quality consistency evaluation of Liuwei Dihuang pills (LDP). Seven bioactive constituents of LDP, including gallic acid, 5-hydroxymethyl furfural, morroniside, paeoniflorin, sweroside, loganin and paeonal, were selected as markers to evaluate the similarities of 20 samples from 16 manufacturers. The similarity values for the 20 LDP samples were all greater than 0.92, indicating that there is a general quality consistency for different manufacturers. Additionally, the 7 selected bioactive compounds were in accordance with the compatibility principle of “the monarch drug, the ministerial drug, the adjunctive drug and the messenger drug” of Traditional Chinese Medicine (TCM) prescription and the multi components quality evaluation requirements of TCM as well. The detection and quantification limits for these 7 bioactive components were all less than 0.11 μg mL−1 and 0.38 μg mL−1, respectively. The mean recovery for all the investigated constituents was acceptable with an accuracy of 98–102%. The intra- and inter-day precisions of this method were less than 4.73%, and stability and repeatability were less than 3.23%. This method is simple and reliable, and also shows that the combination of the chromatographic fingerprint and quantitative analysis offers an efficient solution to quality consistency evaluation of herbal preparations.
    Analytical methods 04/2013; 5(9):2384-2390. DOI:10.1039/C3AY40125A · 1.94 Impact Factor
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    ABSTRACT: In this study, a structured protocol for the classification of wet mass in extrusion-spheronization was developed to predict formation and pellet quality. The wet masses of 120 formulae were prepared taking microcrystalline celluloses as pelletization aid and lactose, hydroxypropyl methylcellulose grades, herbal medicines as model drugs. Physical properties of the wet masses such as hardness, adhesiveness, springiness, cohesiveness, chewiness, and resilience were tested respectively using a texture analyzer. Particles were produced by spheronization process and the quality of spherical pellets was also evaluated. Data were analyzed by principal component analysis, factor analysis and classification analysis. The wet masses could be classified into five groups taking the ratio of hardness to springiness (Ha/Sp) as the first classification index and chewiness, resilience as the second and the third classification index. The wet masses of different classification could correspondingly form the different shapes. So a new protocol could be devised, for example, if the range of Ha/Sp of the wet masses was 30,992-47,689 g, at the same time the value of chewiness was less than 4,842 and the value of resilience was no more than 0.139, it would form spherical pellets under the experimental condition. These results demonstrate that the proposed protocol could be a valuable asset in a formulation development project to assess the physical properties of wet masses and to predict formation and pellet quality. So the tedious and expensive pre-production (pre-formulation and optimization) work could be considerably reduced.
    European journal of pharmaceutics and biopharmaceutics: official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V 04/2013; 85(3). DOI:10.1016/j.ejpb.2013.03.016 · 4.25 Impact Factor
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    ABSTRACT: To provide a mathematical set-based method for evaluating drug release kinetics of multi-component traditional Chinese medicine preparations. With Fuzheng Huayu prescription as the study model, a mathematical set-based method for evaluating drug release kinetics was established to guide the preparation of drug release system of Fuzheng Huayu prescription, and a quantitative evaluation was made for its multi-component drug release characteristics. Its accuracy was verified by Kalman filtering method. The comparison between the two showed that the sample No. 4 of Fuzheng Huayu drug release system showed synchronized drug release with its reference preparation Fuzheng Huayu capsules. The results verified the accuracy and rationality of the evaluation method based on mathematics set. Meanwhile, it displayed the release of target preparations according to asynchronous coefficient (k) and other parameters, and found the orientation of regulating and improving the unit drug release dosage from relevant error parameters of various characteristic peak information, in order to purposefully regulate relevant components, and enable target preparations to meet the synchronized drug release requirements of the reference preparation. Meanwhile, it provided an effective measure for evaluating the quantitative characterization and synchronized release behavior of multi-component traditional Chinese medicines.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 04/2013; 38(8):1165-71.
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    ABSTRACT: Obesity is becoming a health concern worldwide and metformin, a first line anti-diabetic drug, was associated with weight loss under different backgrounds. However, most researches focused on the anti-diabetic mechanism and less attention has been paid on the mechanism of weight loss of metformin. Therefore, we established a metabonomic method to evaluate metformin action in preventing obesity in a high fat diet-induced-obesity (DIO) mice model. 36 male C57BL/6 mice (8-week old) were randomly divided into control group (n=12, normal chow), model group (n=12, high fat chow) and metformin group (n=12, high fat chow and dosed with metformin) over 16 weeks. A urinary metabonomic study using UPLC-TOF/MS was performed in combination with multivariate statistical analysis. In addition, indices of body weight and food intake as well as fasting blood glucose, fed blood glucose, oral glucose tolerance test (OGTT) and plasma insulin were collected. Significant weight loss in metformin-treated mice was achieved and 21 potential biomarkers were identified. Decreased glucose, myristic acid, stearidonic acid, lysoPC (16:0), lysoPC (18:0), l-glutamic acid, l-methionine, l-threonine, l-phenylalanine, l-histidine, l-carnitine, l-malic acid and pantothenic acid in urine indicated that metformin may have exerted effects on energy metabolism. Further, based on the biomarkers, we cautiously propose that tricarboxylic acid cycle (TCA) may have been compromised by metformin and might contribute to the activation of adenosine monophosphate kinase (AMPK), then AMPK activation led to more ß-oxidation of certain fatty acids and augmented lipolysis and thus induced weight loss. Related cellular and molecular studies are being considered to further investigate the underlying mechanism.
    Journal of chromatography. B, Analytical technologies in the biomedical and life sciences 03/2013; 925C:110-116. DOI:10.1016/j.jchromb.2013.02.040 · 2.69 Impact Factor
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    ABSTRACT: Due to the limitation of science and technology in ancient times, traditional Chinese medicines (TCMs) could have prepared only in traditional dosage forms, such as pills, powders, ointments and pellets. Though studies on multi-component TCMs have become one of major development orientations of TCM, the druggability of their preparations has always been neglected. On the basis of two key difficulties--the integration of studies on multi-component TCMs and TCM theory as well as the evaluation on their druggability, the essay proposes methods and technologies that can be adopted in studies on multi-component TCM preparations, including the characteristic physicochemical property of multi-component TCMs and its correlation with forming process, the release-modified micro pill preparation technology based on prescription-symptom-dosage, and the evaluation technology on release of release-modified micro pill components based on mathematical set model.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 03/2013; 38(5):629-32.