نتایج جستجو برای: chitosan oligomers

تعداد نتایج: 26698  

Journal: :فصلنامه علمی پژوهشی گیاهان دارویی 0
s esmaeilzadeh bahabadi department of biology, faculty of basic sciences, university of zabol, zabol, iran, p.o.box: 98615-538 tel: +98-542- 4822187, fax: +98-542-2226765 m sharifi tarbiat modares university j murata bioorganic research institute h satake bioorganic research institute

background: linum album, a herbaceous and medicinal plant, has been shown to accumulate anti-tumor podophyllotoxin (ptox) and related lignans. objective: in this study, we have verified the time-course of cell growth, lignan production in cells treated with chitosan and chitin oligomers. to study mechanism of chitosan and chitin oligomers action, expression of phenylalanine ammonio-lyase (pal),...

H Satake , J Murata , M Sharifi , S Esmaeilzadeh Bahabadi ,

Background: Linum album, a herbaceous and medicinal plant, has been shown to accumulate anti-tumor podophyllotoxin (PTOX) and related lignans. Objective: In this study, we have verified the time-course of cell growth, lignan production in cells treated with chitosan and chitin oligomers. To study mechanism of chitosan and chitin oligomers action, expression of phenylalanine ammonio-lyase (PAL)...

خاکشور, محمد صادق, پازوکی, جمیله,

Background and purpose: Chitin is one of the main components of crustaceans’ exoskeleton. Chitosan is produced by deacetylation of chitin. Molecular weight and degree of deacetylation play important roles in biological activity of chitin, chitosan, and their derivatives. So far, various derivatives of chitin and chitosan are obtained. The purpose of this study was to prepare derivatives o...

Journal: :Carbohydrate polymers 2017
Yiming Feng Georg Kopplin Kimihiko Sato Kurt I Draget Kjell M Vårum

Alginates are polysaccharides that are widely used in relation to their ability to form gels. Recently we reported that alginates may also form gels with chitosan oligomers as crosslinkers (Khong, Aarstad, Skjåk-Bræk, Draget, & Vårum, 2013). The purpose of the present study was to characterize alginate gels crosslinked with calcium and chitosan oligomers. Using two different alginates of simila...

2012
Prerna P. Dhawade Ramanand N. Jagtap

In differential scanning calorimetry (DSC), remnant moisture loss in samples often overlaps and distorts thermal events such as glass transitions. Temperature modulated DSC (TMDSC) is known for separating such overlapping processes. In this study, chitosan was depolymerized by oxidative degradation method. By this method, chitooligomers of different molecular weights were produced. The glass tr...

2015
Stefanie Nicole Hamer Stefan Cord-Landwehr Xevi Biarnés Antoni Planas Hendrik Waegeman Bruno Maria Moerschbacher Stephan Kolkenbrock

Chitin and chitosan oligomers have diverse biological activities with potentially valuable applications in fields like medicine, cosmetics, or agriculture. These properties may depend not only on the degrees of polymerization and acetylation, but also on a specific pattern of acetylation (PA) that cannot be controlled when the oligomers are produced by chemical hydrolysis. To determine the infl...

2016
Khalid A. Ibrahim Bassam I. El-Eswed Khaleel A. Abu-Sbeih Tawfeeq A. Arafat Mahmoud M. H. Al Omari Fouad H. Darras Adnan A. Badwan

An increasing interest has recently been shown to use chitin/chitosan oligomers (chito-oligomers) in medicine and food fields because they are not only water-soluble, nontoxic, and biocompatible materials, but they also exhibit numerous biological properties, including antibacterial, antifungal, and antitumor activities, as well as immuno-enhancing effects on animals. Conventional depolymerizat...

Background and Aim: Regarding to various problems in the activation of dendritic cells and immune system’s responses, finding of a safe, effective and applicable agent is highly desirable. Chitosan is an effective gene delivery agent and also a part of nanoscaffolds. In the present study,chitosan nanopolymers effect on dendritic immune cells were assessed. Materials and Methods: In this experim...

Journal: :Chemical communications 2013
Natasha H Munro David W Green Kathryn M McGrath

Continuous self-assembled growth of both the organic and inorganic components of materials with nacre-like structure is achieved upon mineralisation of chitin and chitosan scaffolds using a combined soaking method and the inclusion of poly(acrylic acid) and chitosan oligomers as additives.

Journal: :The Biochemical journal 2005
Acharya B Vishu Kumar Mandyam C Varadaraj Lalitha R Gowda Rudrapatnam N Tharanathan

Papain (from papaya latex; EC 3.4.22.2) and Pronase (from Streptomyces griseus; EC 3.4.24.31) caused optimum depolymerization of chitosan at pH 3.5 and 37 degrees C, resulting in LMMC (low molecular mass chitosan) and chito-oligomeric-monomeric mixture. The yield of the latter was 14-16% and 14-19% respectively for papain- and Pronase-catalysed reactions, depending on the reaction time (1-5 h)....

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