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Spray congealing as a microencapsulation technique to develop modified-release ibuprofen solid lipid microparticles: the effect of matrix type, polymeric additives and drug-matrix miscibility.This study aimed to achieve modified-release of ibuprofen (IBU) by encapsulation within lipid-based matrix materials [cetyl alcohol (CA), stearic acid (SA) and glyceryl dibehenate (GB)] using spray congealing to produce solid lipid microparticles (SLMs). Polymeric additives, polyvinyl-2-pyrrolidone-vinyl-acetate and ethylcellulose, were employed as release-modifying agents. Spray-congealed SLMs yield, scanning electron microscopy (SEM)-based morphology, particle size, drug content and entrapment efficiency were investigated. The influence of matrix type, additive type and concentration and drug-matrix miscibility on release of IBU was elucidated. Yields (81.4-96.4%) and drug encapsulation efficiencies (88.4-100%) of SLMs were high for all formulations. SLMs were generally discrete, spherical and dense. Increasing additives concentration led to not only larger median size SLMs but also faster drug release due to increased hydrophilicity conferred by the additives. Solid solution systems (SA-IBU, GB-IBU) sustained the release of IBU better than solid dispersion system (CA-IBU). CA- and GB-based SLMs closely adhered to the Weibull model of drug release, while SA counterparts followed the Korsmeyer-Peppas model.
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The importance of binder moisture content in Metformin HCL high-dose formulations prepared by moist aqueous granulation (MAG).The aim of this study was to evaluate binders to improve the flowability of granulates and compactibility of Metformin HCL (Met) using the moist aqueous granulation (MAG) process. The effect of the binder moisture content on granulate and tablet quality was also evaluated. Vinylpyrrolidone-vinyl acetate copolymer (Kollidon VA64 fine: VA64), polyvidone (Povidone K12: PVP), hydroxypropyl cellulose (HPC SSL SF: HPC) and hydroxypropyl methylcellulose (Methocel E5 LV: HPMC) were evaluated as binders. These granulates, except for HPMC, had a lower yield pressure than Met active pharmaceutical ingredient (API). HPMC Met was not sufficiently granulated with low water volume. No problems were observed with the VA64 Met granulates during the tableting process. However, HPC Met granulates had a bowl-forming tendency, and PVP Met granulates had the tendency to stick during the tableting process. These bowl-forming and sticking tendencies may have been due to the low moisture absorbency of HPC and the high volume of bound water of PVP, respectively. VA64 Met granulates had the highest ambient moisture content (bulk water, bound water) and moisture absorbency. It was concluded that the type of binder used for the Met MAG process has an impact on granulate flow and compactibility, as well as moisture absorbency and maintenance of moisture balance.
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Influence of PVP/VA copolymer composition on drug-polymer solubility.In this study, the influence of copolymer composition on drug-polymer solubility was investigated. The solubility of the model drug celecoxib (CCX) in various polyvinylpyrrolidone/vinyl acetate (PVP/VA) copolymer compositions (70/30, 60/40, 50/50 and 30/70 w/w) and the pure homopolymers polyvinylpyrrolidone (PVP) and polyvinyl acetate (PVA) was predicted at 25 °C using a thermal analysis method based on the recrystallization of a supersaturated amorphous dispersion (recrystallization method). These solubilities were compared with a prediction based on the solubility of CCX in the liquid monomeric precursors of PVP/VA, N-vinylpyrrolidone (NVP) and vinyl acetate (VA), using the Flory-Huggins lattice theory (liquid monomer solubility approach). The solubilities predicted from the liquid monomer solubility approach increased linearly with increasing VP/VA ratio from 0.03-0.60 w/w. Even though the solubilities predicted from the recrystallization method also increased with increasing VP/VA ratio from 0.02-0.40 w/w, the predicted solubility seemed to approach a plateau at high VP/VA ratios. Increasing positive deviations from the Gordon-Taylor equation with increasing VP/VA ratio indicated strong interactions between CCX and the VP repeat unit, which was in accordance with the relatively high solubilities predicted using both methods. As the solubility plateau may be a consequence of steric hindrance caused by the size differences between CCX and the VP repeat units, it is likely that a CCX molecule interacting with a VP repeat unit hinders another CCX molecule from binding to the neighboring repeat units in the polymer chain. Therefore, it is possible that replacing these neighboring hygroscopic VP repeat units with hydrophobic VA repeat units, could increase the physical stability of an amorphous solid dispersion without compromising the drug-polymer solubility. This knowledge could be used advantageously in future development of amorphous drug delivery systems as copolymers could be customized to provide optimal drug-polymer solubility and physical stability.
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Development of Tablet Formulation of Amorphous Solid Dispersions Prepared by Hot Melt Extrusion Using Quality by Design Approach.The objective of the study was to identify the extragranular component requirements (level and type of excipients) to develop an immediate release tablet of solid dispersions prepared by hot melt extrusion (HME) process using commonly used HME polymers. Solid dispersions of compound X were prepared using polyvinyl pyrrolidone co-vinyl acetate 64 (PVP VA64), Soluplus, and hypromellose acetate succinate (HPMCAS-LF) polymers in 1:2 ratio by HME through 18 mm extruder. A mixture design was employed to study effect of type of polymer, filler (microcrystalline cellulose (MCC), lactose, and dicalcium phosphate anhydrous (DCPA)), and disintegrant (Crospovidone, croscarmellose sodium, and sodium starch glycolate (SSG)) as well as level of extrudates, filler, and disintegrant on tablet properties such as disintegration time (DT), tensile strength (TS), compactibility, and dissolution. Higher extrudate level resulted in longer DT and lower TS so 60-70% was the maximum amount of acceptable extrudate level in tablets. Fast disintegration was achieved with HPMCAS-containing tablets, whereas Soluplus- and PVP VA64-containing tablets had higher TS. Crospovidone and croscarmellose sodium were more suitable disintegrant than SSG to achieve short DT, and MCC was a suitable filler to prepare tablets with acceptable TS for each studied HME polymer. The influence of extragranular components on dissolution from tablets should be carefully evaluated while finalizing tablet composition, as it varies for each HME polymer. The developed statistical models identified suitable level of fillers and disintegrants for each studied HME polymer to achieve tablets with rapid DT (<15 min) and acceptable TS (≥1 MPa at 10-15% tablet porosity), and their predictivity was confirmed by conducting internal and external validation studies.
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Effect of Water on Molecular Mobility and Physical Stability of Amorphous Pharmaceuticals.We investigated the influence of sorbed water concentration on the molecular mobility and crystallization behavior in a model amorphous drug and a solid dispersion. The temperature scaling (Tg/T) allowed us to simultaneously evaluate the effects of water content and temperature on the relaxation time. In the supercooled dispersions, once scaled, the relaxation times of the systems with different water content overlapped. Thus, the observed increase in mobility could be explained by the "plasticization" effect of water. This effect also explained the decrease in crystallization onset temperature brought about by water. That is, plasticization is the underlying mechanism governing the observed increase in mobility and physical instability in the supercooled state. Similar results were observed in the glassy drug substance. A single linear relationship was observed between crystallization time (time for 0.5% crystallization) and Tg/T in both dry and water containing systems. Since fragility is unaffected by modest amounts of water, much like crystallization time, the mobility in the glass is expected to scale with Tg.
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Anti-cancer Effects of a Novel Quinoline Derivative 83b1 on Human Esophageal Squamous Cell Carcinoma through Down-Regulation of COX-2 mRNA and PGE2.83b1 is a novel quinoline derivative that has been shown to inhibit cancer growth in human esophageal squamous cell carcinoma (ESCC). This study was conducted to comprehensively evaluate the cytotoxic effects of 83b1 on a series of ESCC cell lines and investigate the mechanisms by which 83b1 suppresses cancer growth based on molecular docking analysis.
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[Effect of downregulation of Tiam1 by siRNA on esophageal squamous cell carcinoma EC9706 cells].To explore the effect of downregulation of Tiam1 by siRNA on the esophageal squamous cell carcinoma (ESCC) EC9706 cells, and provide theoretical basis for gene therapy of ESCC using Tiam1 as a molecular target.
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Excess visceral adiposity induces alterations in mitochondrial function and energy metabolism in esophageal adenocarcinoma.Visceral obesity has a strong association with both the incidence and mortality of esophageal adenocarcinoma (EAC). Alterations in mitochondrial function and energy metabolism is an emerging hallmark of cancer, however, the potential role that obesity plays in driving these alterations in EAC is currently unknown.
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Clinical significance of telomerase and its associate genes expression in the maintenance of telomere length in squamous cell carcinoma of the esophagus.To observe the interaction between the expression of telomerase activity (TA) and its associate genes in regulation of the terminal restriction fragment length (TRFL) in esophageal squamous cell carcinoma (SCC).
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IL-15 receptor alpha rs2228059 A>C polymorphism was associated with a decreased risk of esophageal cancer in a Chinese population.Esophageal cancer is the sixth leading cause of cancer-related deaths worldwide. Esophageal cancer is very aggressive; genetic polymorphisms may explain in part the individual differences in esophageal cancer susceptibility. We conducted a hospital based case-control study to evaluate the genetic effects of functional single nucleotide polymorphisms (SNPs) in the interleukin (IL)-15 and IL-15 receptor alpha (IL-15RA) gene on the development of esophageal cancer. A total of 380 esophageal squamous cell carcinoma (ESCC) cases and 380 controls were recruited for this study. The genotypes were determined using a custom-by-design 48-Plex SNPscan(TM) kit. The IL-15RA rs2228059 A>C polymorphism was associated with a decreased risk of ESCC in a recessive genetic model; However, there was no significant association between the other five SNPs and ESCC risk. Stratified analyses indicated a significantly decreased risk of ESCC associated with the IL-15RA rs2228059 A>C polymorphism was evident among male, older, non-smoker, and non-drinker patients. These findings indicated that the functional polymorphism, IL-15RA rs2228059 A>C, might contribute to ESCC susceptibility. However, the statistical power of our study was limited because of the moderate sample size and absence of a validation cohort. Large well-designed studies are warranted to confirm our findings.
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