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https://www.readbyqxmd.com/read/29458211/impact-of-formulation-excipients-on-the-thermal-mechanical-and-electrokinetic-properties-of-hydroxypropyl-methylcellulose-acetate-succinate-hpmcas
#1
Tanvi M Deshpande, Anisul Quadir, Sakae Obara, Stephen W Hoag
Hydroxypropyl methylcellulose acetate succinate (HPMCAS) has been widely used in amorphous solid dispersions and as an enteric coating polymer. Under aqueous coating conditions and at elevated coating temperatures, HPMCAS particles tend to aggregate and clog the spray-nozzle, hence interrupting the coating process. This research focused on how plasticizers and surfactants, excipients used for aqueous coating, affect the properties and stability of HPMCAS. This information would be useful in identifying suitable excipients for developing a stable HPMCAS aqueous enteric coating formulation...
February 16, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29456812/preparation-and-evaluation-of-pcl-peg-pcl-micelles-as-potential-nanocarriers-for-ocular-delivery-of-dexamethasone
#2
Mitra Alami-Milani, Parvin Zakeri-Milani, Hadi Valizadeh, Roya Salehi, Mitra Jelvehgari
Objectives: Micelles have been studied as nanoparticulate drug delivery systems for improving the topical ocular delivery of hydrophobic drugs. The objective of this study was to develop and characterize dexamethasone-loaded polycaprolactone-polyethylene glycol-polycaprolactone (PCL-PEG-PCL) micelles to improve patient compliance and enhance the ocular bioavailability of poorly water-soluble drugs. Materials and Methods: The PCL-PEG-PCL copolymers were synthesized via the ring opening polymerization of ε-caprolactone in the presence of PEG...
February 2018: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29455989/biocompatible-nanocomposite-of-carboxymethyl-cellulose-and-functionalized-carbon-norfloxacin-intercalated-layered-double-hydroxides
#3
N'guadi Blaise Allou, Archana Yadav, Mintu Pal, Rajib Lochan Goswamee
In recent years, the development of systems with progressive drug release properties, which is an effective technique for the use of drugs, has aroused great interest in the field of controlled release formulations. In this work, hybrid materials containing citric acid cross-linked carboxymethyl cellulose (CMC) and norfloxacin (NOR) intercalated layered double hydroxide (LDH) deposited over the surface of functionalized carbon (AC) were prepared. The synthesized CMC@AC-LDHNOR nanohybrids were characterized using different techniques and in vitro NOR release behaviors were investigated in phosphate buffer saline, pH 7...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29452970/effect-of-tear-supplements-on-signs-symptoms-and-inflammatory-markers-in-dry-eye
#4
Eilidh Martin, Katherine M Oliver, E Ian Pearce, Alan Tomlinson, Peter Simmons, Suzanne Hagan
PURPOSE: Three tear supplements were compared for their effects on the signs, symptoms and inflammatory status of subjects with dry eye disease. Assessments were made before and after both 2 and 4 weeks of treatment. METHODS: In this masked, randomized, 3-way crossover trial, eighteen dry eye subjects were recruited. At each visit, symptoms, tear evaporation rate, stability and osmolarity were measured and tear samples were analyzed for 7 inflammatory markers, using multiplex immunoassays...
February 13, 2018: Cytokine
https://www.readbyqxmd.com/read/29452723/q-marker-based-strategy-for-cmc-research-of-chinese-medicine-a-case-study-of-panax-notoginseng-saponins
#5
Yi Zhong, Jieqiang Zhu, Zhenzhong Yang, Qing Shao, Xiaohui Fan, Yiyu Cheng
BACKGROUND: To ensure pharmaceutical quality, chemistry, manufacturing and control (CMC) research is essential. However, due to the inherent complexity of Chinese medicine (CM), CMC study of CM remains a great challenge for academia, industry, and regulatory agencies. Recently, quality-marker (Q-marker) was proposed to establish quality standards or quality analysis approaches of Chinese medicine, which sheds a light on Chinese medicine's CMC study. PURPOSE: Here manufacture processes of Panax Notoginseng Saponins (PNS) is taken as a case study and the present work is to establish a Q-marker based research strategy for CMC of Chinese medicine...
January 31, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29452141/a-rich-source-of-potential-bioactive-compounds-with-anticancer-activities-by-catharanthus-roseus-cambium-meristematic-stem-cell-cultures
#6
So Hyun Moon, Muthuraman Pandurangan, Doo Hwan Kim, Jelli Venkatesh, Rahul V Patel, Bhupendra M Mistry
ETHNOPHARMACOLOGICAL IMPORTANCE: Catharanthus roseus (L.) G. Don. is an important medicinal plant with rich sources of remarkable health benefits consisting more than 100 alkaloids and significant amounts of bioactive compounds, which have been widely used as a folk medicine for treatment of several pathologies. THE AIM OF THE STUDY: In the present study, we isolated and cultured innately undifferentiated cambium meristematic cells (CMCs), which were observed stable cell growth, enhancement of bioactive compounds from C...
February 13, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29451099/a-systematic-review-and-meta-analysis-of-arthroscopic-assisted-techniques-for-thumb-carpometacarpal-joint-osteoarthritis
#7
Suzanne C Wilkens, Claudia A Bargon, Amin Mohamadi, Neal C Chen, J Henk Coert
Arthroscopic management of thumb carpometacarpal (CMC) osteoarthrosis (OA) is an approach that has unclear results. We performed a systematic review encompassing three electronic databases up to May 2016 for studies describing arthroscopic-assisted techniques for thumb CMC OA. Meta-analyses of visual analogue scores (VAS) for pain, Disabilities of the Arm, Shoulder and Hand (DASH) scores, grip strength and pinch strength before and after arthroscopy were performed for ten included non-randomized cohort studies comprising 294 patients...
January 1, 2018: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/29448170/study-of-interaction-between-ionic-liquids-and-orange-g-in-aqueous-solution-with-uv-vis-spectroscopy-and-conductivity-meter
#8
Jin-Ping Zha, Meng-Ting Zhu, Li Qin, Xin-Hong Wang
The interactions between Orange G (OG) with three kinds of ionic liquid surfactants (C 10 mimBF 4 , C 12 mimBF 4 , C 16 mimBF 4 ) and CTAB were studied with UV-Vis spectra and conductivity measurements. The systematic changes in UV-Vis spectra with an increase of carbon-chain length may be observed in presence of OG. They correspond to CMC of every system, respectively, and the CMCs of four systems have exhibit the decrease of CMCs compared to pure surfactant. The binding constants are calculated from the results of conductivity measurements in the order of C 16 mimBF 4 >CTAB>C 12 mimBF 4 >C 10 mimBF 4 ...
February 6, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29444568/structural-features-of-reconstituted-cuticular-wax-films-upon-interaction-with-nonionic-surfactant-c12e6
#9
Elias Pambou, Xuzhi Hu, Zongyi Li, Mario Campana, Arwel Hughes, Peixun Li, John Robert Peter Webster, Gordon Bell, Jian Ren Lu
The interaction of nonionic surfactant hexaethylene glycol monododecyl ether (C12E6) with a reconstituted cuticular wheat wax film has been investigated by spectroscopic ellipsometry (SE) and neutron reflection (NR) to help understand the role of the leaf wax barrier during pesticide uptake, focusing on the mimicry of the actions adjuvants impose on the physical integrity and transport of the cuticular wax films against surfactant concentration. As C12E6 concentration was increased up to the critical micelle concentration (CMC = 0...
February 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29442931/anti-oxidative-and-antibacterial-self-healing-edible-polyelectrolyte-multilayer-film-in-fresh-cut-fruits
#10
Xuefan Liu, Wei Han, Yanxi Zhu, Hongyun Xuan, Jiaoyu Ren, Jianhao Zhang, Liqin Ge
The consumption of fresh-cut fruits is limited because of the oxidation browning and pathogenic bacteria's growth on the fruit surface. Besides, crack of the fresh-keeping film may shorten the preservation time of fruit. In this work, polyelectrolyte multilayer (PEM) film was fabricated by layer-by-layer (LBL) electrostatic deposition method. The film was made by carboxy methylcellulose sodium (CMC) and chitosan (CS). The as-prepared PEM film had good anti-oxidative and antibacterial capability. It inhibited the growth of Gram-negative bacteria and the antibacterial rate was more than 95%...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442674/development-of-biomimetic-hybrid-porous-scaffold-of-chitosan-polyvinyl-alcohol-carboxymethyl-cellulose-by-freeze-dried-and-salt-leached-technique
#11
K Kanimozhi, S Khaleel Basha, V Sugantha Kumari, K Kaviyarasu
Freeze drying and salt leaching methods were applied to fabricate Chitosan/Poly(vinyl alcohol)/Carboxymethyl cellulose (CPCMC) biomimetic porous scaffolds for soft tissue engineering. The properties of these scaffolds were investigated and compared to those by freeze drying and salt leaching methods respectively. The salt-leached CS/PVA/CMC scaffolds were easily formed into desired shapes with a uniformly distributed and interconnected pore structure with an average pore size. The mechanical strength of the scaffolds increased with the porosity, and were easily modulated by the addition of carboxymethyl cellulose...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29440674/engineering-the-conserved-and-noncatalytic-residues-of-a-thermostable-%C3%AE-1-4-endoglucanase-to-improve-specific-activity-and-thermostability
#12
Xiutao Chen, Weiguang Li, Peng Ji, Yang Zhao, Chengyao Hua, Chao Han
Endoglucanases are increasingly applied in agricultural and industrial applications as a key biocatalyst for cellulose biodegradation. However, the low performance in extreme conditions seriously challenges the enzyme's commercial utilization. To obtain endoglucanases with substantially improved activity and thermostability, structure-based rational design was carried out based on the Chaetomium thermophilum β-1,4-endoglucanase CTendo45. In this study, five mutant enzymes were constructed by substitution of conserved and noncatalytic residues using site-directed mutagenesis...
February 13, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29439688/effects-of-substrate-binding-site-residue-substitutions-of-xyna-from-bacillus-amyloliquefaciens-on-substrate-specificity
#13
Anil S Prajapati, Vishakha A Pawar, Ketankumar J Panchal, Ankit P Sudhir, Bhaumik R Dave, Darshan H Patel, R B Subramanian
BACKGROUND: The aromatic residues of xylanase enzyme, W187, Y124, W144, Y128 and W63 of substrate binding pocket from Bacillus amyloliquefaciens were investigated for their role in substrate binding by homology modelling and sequence analysis. These residues are highly conserved and play an important role in substrate binding through steric hindrance. The substitution of these residues with alanine allows the enzyme to accommodate nonspecific substrates. RESULTS: Wild type and mutated genes were cloned and overexpressed in BL21...
February 13, 2018: BMC Biotechnology
https://www.readbyqxmd.com/read/29436875/synthesis-in-vitro-characterization-and-anti-tumor-effects-of-novel-polystyrene-poly-amide-ether-ester-imide-co-polymeric-micelles-for-delivery-of-docetaxel-in-breast-cancer-in-balb-c-mice
#14
Jaleh Varshosaz, Saeede Enteshari, Farshid Hassanzadeh, Batool Hashemi-Beni, Mohsen Minaiyan, Razieh Mirsafaei
OBJECTIVE: the goal of the present work was to make novel co-polymeric micellar carriers for the delivery of docetaxel (DTX). SIGNIFICANCE: Co-polymeric micelles can not only solubilize DTX and eliminate the need for toxic surfactants to dissolve it, but also cause passive targeting of the drug to the tumor and reduce its toxic side effects. METHODS: Poly (styrene-maleic acid) (SMA) was conjugated to poly (amide-ether-ester-imide)-poly ethylene glycol (PAEEI-PEG)...
February 13, 2018: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29434321/the-promotion-function-of-berberine-for-osteogenic-differentiation-of-human-periodontal-ligament-stem-cells-via-erk-fos-pathway-mediated-by-egfr
#15
Jin Liu, Xiaodan Zhao, Dandan Pei, Guo Sun, Ye Li, Chunhui Zhu, Cui Qiang, Junyi Sun, Jianfeng Shi, Yan Dong, Jianzhong Gou, Sicen Wang, Ang Li
Coptidis Rhizoma binds to the membrane receptors on hPDLSC/CMC, and the active ingredient Berberine (BER) that can be extracted from it may promote the proliferation and osteogenesis of periodontal ligament stem cells (hPDLSC). The membrane receptor that binds with BER on the cell surface of hPDLSC, the mechanism of direct interaction between BER and hPDLSC, and the related signal pathway are not yet clear. In this research, EGFR was screened as the affinity membrane receptor between BER and hPDLSC, through retention on CMC, competition with BER and by using a molecular docking simulation score...
February 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29433821/a-method-for-screening-active-components-from-chinese-herbs-by-cell-membrane-chromatography-offline-high-performance-liquid-chromatography-mass-spectrometry-and-an-online-statistical-tool-for-data-processing
#16
Yan Cao, Shaozhan Wang, Yinghua Li, Xiaofei Chen, Langdong Chen, Dongyao Wang, Zhenyu Zhu, Yongfang Yuan, Diya Lv
Cell membrane chromatography (CMC) has been successfully applied to screen bioactive compounds from Chinese herbs for many years, and some offline and online two-dimensional (2D) CMC-high performance liquid chromatography (HPLC) hyphenated systems have been established to perform screening assays. However, the requirement of sample preparation steps for the second-dimensional analysis in offline systems and the need for an interface device and technical expertise in the online system limit their extensive use...
February 6, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29428909/comparison-of-common-burden-tests-for-genetic-association-studies-of-rare-variants
#17
Xin-Qi Lin, Rong Liang, Jun-Guo Zhang, Lu-Cheng Pi, Si-Dong Chen, Li Liu, Yan-Hui Gao
Common burden tests have different statistical performance in genetic association studies of rare variants. Here, we compare the statistical performance of burden tests, such as CMC, WST, SUM and extension methods, using the computer-simulated datasets of rare variants with different parameters of sample sizes, linkage disequilibrium (LD), and different numbers of mixed non-associated variants. The simulation results showed that the type I error for all methods is near 0.05. When the rare variants had the same direction of effect, the higher LD and the less non-associated variants, the higher the power of these method, except the data adaptive SUM test...
February 20, 2018: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/29427677/development-of-graft-copolymer-of-carboxymethylcellulose-and-n-vinylcaprolactam-towards-strong-antioxidant-and-antibacterial-polymeric-materials
#18
Ashok Kumar, Deepak, Swati Sharma, Shere Afgan, Rajesh Kumar, Anand Kumar Keshari, Ragini Srivastava
The present paper reports graft copolymerization of N-vinylcaprolactam (NVCL) onto carboxymethylcellulose (CMC) using tert-butyl hydroperoxide (TBHP) initiator in N2 atmosphere. The grafting was found to be highest when concentrations of CMC, NVCL and TBHP were 6.25 × 10-2 g dm-3, 10 × 10-3 mol dm-3 and 20 × 10-5 mol dm-3 respectively. The graft copolymer (CMC-g-PNVCL-1) was characterized by FTIR, 1HNMR, SEM, AFM, XRD and TGA analysis. The antioxidant activity of the graft copolymer was found to be higher (3...
February 7, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29427367/effects-of-biorelevant-media-components-on-dissolution-behaviour-of-1-2-4-thiadiazole-derivative-designed-for-alzheimer-s-disease-prevention
#19
Maria Promzeleva, Mikhail Chislov, Tatyana Volkova, Alexey Proshin, Roman Kumeev, Irina Terekhova
In this study, dissolution behaviour of 1,2,4-thiadiazole derivative (1-[5-(3-chloro-phenylamino)-1,2,4-thiadiazol-3-yl]-propan-2-ol) displaying an anti-Alzheimer activity was examined in biorelevant media such as Simulated Gastric Fluid (SGF, pH 1.2), Fasted State Simulated Gastric Fluid (FaSSGF, pH 1.6) and Fasted State Simulated Intestinal Fluid (FaSSIF, pH 6.5). It was found that solubility and dissolution rate of 1,2,4-thiadiazole derivative under consideration are not strongly dependent on pH, whereas these parameters are significantly affected by the buffer composition...
December 16, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/29426248/cholesterol-and-vitamin-e-conjugated-pegylated-polymeric-micelles-for-efficient-delivery-and-enhanced-anticancer-activity-of-curcumin-evaluation-in-2d-monolayers-and-3d-spheroids
#20
Omkara Swami Muddineti, Asmitha Vanaparthi, Sri Vishnu Kiran Rompicharla, Preeti Kumari, Balaram Ghosh, Swati Biswas
A newly synthesized PEGylated cholesterol/α-tocopheryl succinate (α-TOS) linked polymer (CV) was self-assembled and loaded with curcumin to form a micellar system (C-CVM). The tri-functionalized amphiphilic polymer was constituted of hydrophobic cholesterol and α-TOS connected to hydrophilic PEG via a lysine linker. The synthesized polymer and the micelles were characterized by 1 H NMR, DLS, zeta potentiometer, TEM, CMC determination and hemolysis studies. CVM displayed low CMC value of 15 µM with extent of hemolysis as less than 4%...
February 9, 2018: Artificial Cells, Nanomedicine, and Biotechnology
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