Results 211 to 220 of about 60,963 (257)
Some of the next articles are maybe not open access.
International Journal of Biological Macromolecules, 1989
Chitin dissolved in N,N-dimethylacetamide, N-methyl-2-pyrrolidone and their mixed solvents in the presence of 5% LiCl was treated with acetic anhydride-pyridine, and the mixture solution was heated at 100 degrees C for 6 h to give a partially O-acetylated chitin gel. Chitin dissolved in these solvents in the presence of 5% LiCl was mixed with pyridine,
S, Hirano, K, Horiuchi
openaire +2 more sources
Chitin dissolved in N,N-dimethylacetamide, N-methyl-2-pyrrolidone and their mixed solvents in the presence of 5% LiCl was treated with acetic anhydride-pyridine, and the mixture solution was heated at 100 degrees C for 6 h to give a partially O-acetylated chitin gel. Chitin dissolved in these solvents in the presence of 5% LiCl was mixed with pyridine,
S, Hirano, K, Horiuchi
openaire +2 more sources
Tissue Engineering, 2004
The polysaccharide chitin is found in nature as a major component of the organic fraction of several biocomposites in which an organic matrix is associated with an inorganic fraction. The relationship between the mineral phase and the organic phase implies a high level of molecular recognition.
FALINI, GIUSEPPE, FERMANI, SIMONA
openaire +2 more sources
The polysaccharide chitin is found in nature as a major component of the organic fraction of several biocomposites in which an organic matrix is associated with an inorganic fraction. The relationship between the mineral phase and the organic phase implies a high level of molecular recognition.
FALINI, GIUSEPPE, FERMANI, SIMONA
openaire +2 more sources
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.
G N, RAMACHANDRAN, C, RAMAKRISHNAN
openaire +2 more sources
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.
G N, RAMACHANDRAN, C, RAMAKRISHNAN
openaire +2 more sources
Shrimp chitin as substrate for fungal chitin deacetylase
Applied Microbiology and Biotechnology, 2001The 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.
N N, Win, W F, Stevens
openaire +2 more sources
Enzymatic degradation of chitins and partially deacetylated chitins
International Journal of Biological Macromolecules, 1994The 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.
Y, Shigemasa +3 more
openaire +2 more sources
Thermal characteristics of chitin and hydroxypropyl chitin
Polymer, 1994Abstract 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
Seong Soo Kim +3 more
openaire +1 more source
Biochimica et Biophysica Acta, 1960
Abstract A new structure is proposed for the polysaccharide chitin, [C8H13O5N]n. X-ray diffraction fibre photographs of lobster tendon reveal a well-defined orthorhombic lattice with the space group P212121 and cell dimensions of a = 4.69 A , b = 19.13 A , and c = 10.43 A (fibre repeat).
openaire +2 more sources
Abstract A new structure is proposed for the polysaccharide chitin, [C8H13O5N]n. X-ray diffraction fibre photographs of lobster tendon reveal a well-defined orthorhombic lattice with the space group P212121 and cell dimensions of a = 4.69 A , b = 19.13 A , and c = 10.43 A (fibre repeat).
openaire +2 more sources
Chitin solutions and purification of chitin
1988Publisher Summary This chapter describes the dissolution and purification of chitin isolates via the newer anhydrous media. There is no clear line of demarcation between chitin isolation and its purification, but the isolation method affects chitin quality and in part determines any additional dissolution and other purification steps required.
openaire +1 more source
NMR studies of chitin and chitin derivatives
Die Makromolekulare Chemie, 1982AbstractThe 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. +2 more
openaire +1 more source
2009
Abstract Natural Resources Chitin is a biopolymer found in crustaceans shells (crab, shrimp, prawn, lobster) in some mollusks (krill, oyster, clam shells, squid skeleton). It is also found in fungi (mushrooms, yeast) and in various insects (cockroaches, silkworms, spiders, beetles).
Rachel Mansencal +2 more
openaire +1 more source
Abstract Natural Resources Chitin is a biopolymer found in crustaceans shells (crab, shrimp, prawn, lobster) in some mollusks (krill, oyster, clam shells, squid skeleton). It is also found in fungi (mushrooms, yeast) and in various insects (cockroaches, silkworms, spiders, beetles).
Rachel Mansencal +2 more
openaire +1 more source