Results 151 to 160 of about 165,219 (191)

Contribution to the Study of the Complexation of Copper by Chitosan and Oligomers

Polymer, 2002
The complexation of copper ions by chitosan and its oligomers is investigated using potentiometric and spectrophotometric methods to study the nature of the complexes involved and the role of the degree of polymerisation. Two complexes are demonstrated.
Jacques Desbrières, M Rinaudo
exaly   +4 more sources

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Antibacterial Activity of Chitosans and Chitosan Oligomers With Different Molecular Weights

International Journal of Food Microbiology, 2002
Antibacterial activities of six chitosans and six chitosan oligomers with different molecular weights (Mws) were examined against four gram-negative (Escherichia coli, Pseudomonas fluorescens, Salmonella typhimurium, and Vibrio parahaemolyticus) and seven gram-positive bacteria (Listeria monocytogenes, Bacillus megaterium, B.
Samuel P Meyers, Hong Kyoon No
exaly   +3 more sources

Spherulitic Crystallization of Chitosan Oligomers

Langmuir, 1999
Chitosan crystallization, performed by simple drying of an oligomer or polymer solution on a glass or mica surface, was studied at room temperature. Polarizing microscopy revealed the formation of two-dimensional spherulites that were shown to have a negative birefringence. After metal shadowing, electron microscopy investigations allowed the molecular
Belamie, E., Domard, A., Chanzy, H., Giraud-Guille, Marie-Madeleine   +3 more
openaire   +2 more sources

Preparation of chitosan oligomers by irradiation

Polymer Degradation and Stability, 2002
Abstract Chitosans (20 and 100 cp, 2%) were irradiated in acetic acid solution (2%) with different doses (2–200 kGy) of Co-60 gamma rays to investigate the yields of chitosan oligomers. A rapid decrease of viscosity was observed up to 10 kGy and then the viscosity decrease slowed down gradually with increasing irradiation dose.
Won-Seok Choi, Kil-Jin Ahn, Dong-Wook Lee, Myung-Woo Byun, Hyun-Jin Park   +4 more
openaire   +1 more source

Dissecting the conformational determinants of chitosan and chitlac oligomers

Biopolymers, 2018
AbstractChitosan and its highly hydrophilic 1‐deoxy‐lactit‐1‐yl derivative (Chitlac) are polysaccharides with increasing biomedical applications. Aimed to unravel their conformational properties we have performed a series of molecular dynamics simulations of Chitosan/Chitlac decamers, exploring different degrees of substitution (DS) of lactitol side ...
Esteban, C., Donati, I., Pantano S., Villegas M., Benegas, J., Paoletti, S.   +5 more
openaire   +3 more sources

Preparation of Chitosan Oligomers by Immobilized Papain

Enzyme and Microbial Technology, 2002
Abstract Immobilized papain was used to prepare chitosan oligomers and the optimum conditions were as follows: NaAc–HAc buffer system, pH 4.0, temperature 45 °C. After 24 h reaction with stirring, nanofiltration and ultrafiltration were used to desalt and isolate chitosan oligomers into different molecular weight fractions respectively.
Changhu Xue
exaly   +2 more sources

The conformational study of chitin and chitosan oligomers in solution

Bioorganic & Medicinal Chemistry, 2001
The inter-residual dihedral angles phi and phip of chitin and chitosan oligomers were determined from experimental 3J(C-H) constants and ROESY cross peaks.
H, Sugiyama, K, Hisamichi, K, Sakai, T, Usui, J I, Ishiyama, H, Kudo, H, Ito, Y, Senda   +7 more
openaire   +2 more sources

Analysis of antioxidant properties of chitosan and its oligomers

Bulletin of Experimental Biology and Medicine, 2006
Oral treatment with chitosan with a molecular weight approximately 105, but not its oligomer, reduced plasma content of free-radical oxidation products in normal rats and animals treated for the bone marrow form of radiation sickness and stimulated the recovery processes in involved bone marrow and peripheral blood.
A S, Koryagin, E A, Erofeeva, N O, Yakimovich, E A, Aleksandrova, L A, Smirnova, A V, Mal'kov   +5 more
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Interfacial Properties of Chitosan-PEO Graft Oligomers: Surface Competition with Unmodified Chitosan Oligomers

2006
Oligomers of chitosan carrying 45 units long poly(ethylene oxide), PEO, chains grafted to the C-6 position of the sugar units were prepared using a novel synthesis route. The graft density was high, close to one poly(ethylene oxide) chain grafted to each sugar unit of the chitosan oligomer but a small fraction of unreacted chitosan remained in the ...
Dedinaite, Andra, Iruthayaraj, Joseph, Gorochovceva, Natalija, Makuska, Ricardas, Claesson, Per M., Iruthayaraj, Joseph   +5 more
openaire   +1 more source

Enzymatic sequencing of partially acetylated chitosan oligomers

Carbohydrate Research, 2014
Chitosan oligosaccharides have diverse biological activities with potentially valuable applications, for example, in the fields of medicine and agriculture. These functionalities are thought to depend on their degree of polymerization and acetylation, and possibly on specific patterns of acetylation.
Stefanie Nicole Hamer, Bruno Maria Moerschbacher, Stephan Kolkenbrock   +2 more
openaire   +2 more sources