Results 351 to 360 of about 182,016 (397)

Chitin and chitosan on the nanoscale

Nanoscale Horizons, 2021
Nanochitin and nanochitosan are nanowhiskers combining the structural strength of nanocellulose with the versatile chemistry of chitin/chitosan. We review their fabrication, properties and uses, with a focus on recent progress.
Jin, Tony, Liu, Tracy, Lam, Edmond, Moores, Audrey   +3 more
openaire   +4 more sources

The structure of chitin

Biochimica et Biophysica Acta, 1962
The structure factors for the various reflections of α-chitin have been calculated for both the structures of Carlstrom and of Dweltz. Comparison with observation does not indicate the definite superiority of one over the other, although Carlstrom's structure seems to be better from stereochemical considerations.
C. Ramakrishnan, G. N. Ramachandran
openaire   +3 more sources

Chitin

2011
A comprehensive profile of chitin with 61 references is reported. A full description including nomenclature, formulae, elemental analysis, and appearance is included. Methods of preparation for chitin and its derivative, such as chitosan, are discussed.
Stephen A. Leharne, Adnan A. Badwan, Nidal Daraghmeh, Mahmoud M. Al Omari, Babur Z. Chowdhry   +4 more
openaire   +3 more sources

Chitin and chitosan nanofibers: electrospinning of chitin and deacetylation of chitin nanofibers

Polymer, 2004
Abstract An electrospinning method was used to fabricate chitin nanofibous matrix for wound dressings. Chitin was depolymerized by gamma irradiation to improve its solubility. The electrospinning of chitin was performed with 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as a spinning solvent.
Jung Nam Lim, Young You, Pil Hyun Kang, Won Ho Park, Taek Seung Lee, Byung-Moo Min, Sung Won Lee   +6 more
openaire   +2 more sources

Polyphenol-mediated chitin self-assembly for constructing a fully naturally resourced hydrogel with high strength and toughness.

Materials Horizons, 2021
Natural polymeric hydrogels are expected to serve as potential structural biomaterials, but, most of them are usually soft and fragile. Herein, a polyphenol-mediated self-assembly (PMS) strategy was developed to significantly enhance the chitin hydrogel ...
Xinghuan Lin, Lina Zhang, Bo Duan
semanticscholar   +1 more source

Thermal characteristics of chitin and hydroxypropyl chitin

Polymer, 1994
Abstract The thermal properties of chitin and hydroxypropyl chitin (HPCH) were examined. Hydroxypropyl chitin was prepared from chitin and propylene oxide. The structure of HPCH was confirmed by solid-state 13 C nuclear magnetic resonance and Fourier-transform infra-red spectroscopy. From the results of elemental analysis, the degree of substitution
Seon Jeong Kim, Yoon Duk Moon, Young Moo Lee, Seong Soo Kim   +3 more
openaire   +2 more sources

Enzymatic degradation of chitins and partially deacetylated chitins

International Journal of Biological Macromolecules, 1994
The enzymatic (lysozyme, chitinase etc.) digestibility of chitins obtained from squid pen and shrimp shell, and of partially deacetylated chitins (DA-chitins) was investigated. The digestibility of various chitins by the chitinase from Bacillus sp. PI-7S was much higher than that by lysozyme, and beta-chitin was digested more smoothly than alpha-chitin.
Kazuo Saito, Hitoshi Sashiwa, Yoshihiro Shigemasa, Hiroyuki Saimoto   +3 more
openaire   +3 more sources

Shrimp chitin as substrate for fungal chitin deacetylase

Applied Microbiology and Biotechnology, 2001
The fungal chitin deacetylases (CDA) studied so far are able to perform heterogeneous enzymatic deacetylation on their solid substrate, but only to a limited extent. Kinetic data show that about 5-10% of the N-acetyl glucosamine residues are deacetylated rapidly. Thereafter enzymatic deacetylation is slow.
W. F. Stevens, N N Win
openaire   +2 more sources

Bioconversion of chitin into chitin oligosaccharides using a novel chitinase with high chitin-binding capacity

International Journal of Biological Macromolecules, 2023
Chitin is the second largest renewable biomass resource in nature, it can be enzymatically degraded into high-value chitin oligosaccharides (CHOSs) by chitinases. In this study, a chitinase (ChiC8-1) was purified and biochemically characterized, its structure was analyzed by molecular modeling.
Qiong, Zhao, Liqiang, Fan, Chen, Deng, Chunyu, Ma, Chunyue, Zhang, Liming, Zhao   +5 more
openaire   +2 more sources

NMR studies of chitin and chitin derivatives

Die Makromolekulare Chemie, 1982
AbstractThe 13C NMR spectra of N‐acetyl‐D‐glucosamine (1) and chitobiose (2), monomer and dimer of chitin, were assigned and used to assign the 13C NMR spectra of chitin in lithium thiocyanate and in LiCl/dimethylacetamide solutions. The dissolution of chitin in formic acid was studied.
Gagnaire, D., Saint-Germain, J., Vincendon, M.   +2 more
openaire   +2 more sources