Results 151 to 160 of about 6,708 (181)

Alternative processes to produce chitin, chitosan, and their oligomers

Carbohydrate Polymers
Sustainable recovery of chitin and its derivatives from shellfish waste will be achieved when the industrial production of these polymers is achieved with a high control of their molecular structure, low costs, and acceptable levels of pollution.
Juan D, Giraldo, Yadiris, García, Myleidi, Vera, Karla A, Garrido-Miranda, Daniela, Andrade-Acuña, Kelly P, Marrugo, Bernabé L, Rivas, Mauricio, Schoebitz   +7 more
openaire   +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

Acid Hydrolysis of Chitosan to Oligomers Using Hydrochloric Acid

Chemical Engineering & Technology, 2019
AbstractThe natural polymer chitosan is widely used for medical and drug delivery applications. Low molecular weight chitosan (LMWC) has superior properties compared to high molecular weight chitosan (HMWC), which open new applications of LMWC, especially in the cosmetics, food, and pharmaceutical industries.
Nawzat D. Aljbour, Mohammad D. H. Beg, Jolius Gimbun   +2 more
openaire   +1 more source

Salt-assisted acid hydrolysis of chitosan to oligomers under microwave irradiation

Carbohydrate Research, 2005
The effect of inorganic salts such as sodium chloride on the hydrolysis of chitosan in a microwave field was investigated. While it is known that microwave heating is a convenient way to obtain a wide range of products of different molecular weights only by changing the reaction time and/or the radiation power, the addition of some inorganic salts was ...
Ronge, Xing, Song, Liu, Huahua, Yu, Zhanyong, Guo, Pibo, Wang, Cuiping, Li, Zhien, Li, Pengcheng, Li   +7 more
openaire   +2 more sources

Advances in understanding bioactivity of chitosan and chitosan oligomers against selected wood-inhabiting fungi

Holzforschung, 2005
Abstract Nitrous acid deaminative depolymerisation was used to prepare three chitosan oligomer (CO) mixtures from high-molecular weight chitosan. These mixtures of chitosan oligosaccharides were analysed by electrospray ionisation mass spectroscopy, potentiometric titration and gel permeation chromatography. A method based on potentiometric
Kirk M. Torr, Colleen Chittenden, Robert A. Franich, Bernhard Kreber   +3 more
openaire   +1 more source

Molecular Weight Dependency of Antimicrobial Activity by Chitosan Oligomers

1994
Chitin, a natural abundant mucopolysaccharide becomes to draw many attentions as a multifunctional polymer owing to the variety of biological activities in spite of its poor solubility. Chitosan, N-deacetylated form of chitin, is also natural mucopolysaccharide as a supporting polymer of fungi or yeast.
S. Sekiguchi, Y. Miura, H. Kaneko, S. I. Nishimura, N. Nishi, M. Iwase, S. Tokura   +6 more
openaire   +1 more source

Introduction of a nitrogen heterocycle into sulphated chitosan oligomers

1999
Chitin is a linear polysaccharide consisting of [-4) 2-acetamido-2-deoxy-p-Dglucopyranose (1- and -4) 2-amino-2-deoxy P-D-glucopyranose (l-]n which occurs widely in nature and which after further de-//-acetylation yields chitosan. Chitin, chitosan and many of their derivatives have found applications in industry, medicine, pharmacology and food ...
F.Santini, G.Crini, C.Cosentino, L.Sturiale, E.A.Yates   +4 more
openaire   +1 more source

Biological activities of chitin, chitosan and respective oligomers

2010
Chitin and chitosan have been receiving great attention as a novel functional material for their excellent biological properties such as biodegradation, immunological, antioxidant and antibacterial activities. However, its use has been scarcely developed due to its high molecular weight, which causes poor water solubility and high viscosity of the ...
Tavaria, F. K., Fernandes, J. C., Santos-Silva, A., Silva, S. Baptista da, Sarmento, B., Pintado, M. E.   +5 more
openaire   +2 more sources

8. Chitosan and Chitosan Oligomers for Nucleic Acid Delivery

Journal of Controlled Release, 2014
openaire   +1 more source

Chitin and chitosan: Properties and applications

Progress in Polymer Science, 2006
Marguerite Rinaudo
exaly