Results 361 to 370 of about 182,016 (397)
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Carbohydrate Polymers, 2017
The biological material, chitin, is present in nature in three allomorphic forms: α, β and γ. Whereas most studies have dealt with α- and β-chitin, only few investigations have focused on γ-chitin, whose structural and physicochemical properties have not been well delineated. In this study, chitin obtained for the first time from the cocoon of the moth
Lalehan Akyuz +9 more
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The biological material, chitin, is present in nature in three allomorphic forms: α, β and γ. Whereas most studies have dealt with α- and β-chitin, only few investigations have focused on γ-chitin, whose structural and physicochemical properties have not been well delineated. In this study, chitin obtained for the first time from the cocoon of the moth
Lalehan Akyuz +9 more
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Cellulose and chitin esters, and the reactivity of cellulose and chitin [PDF]
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1961 On comparison of the reactivities of chitin and cellulose in their conversion into ethers and esters it is found that chitin is considerably less reactive than cellulose, which is to be attributed to a difference in the internal active surfaces.
É. A. Pyaivinen +2 more
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Polymer Bulletin, 1989 SUMMARY Chitin was aminoalkylated with N,N-diethylaminoethyl chloride in organic solvents or aqueous solutions in the presence of sodium hydroxide. The substitution reactions in organic solvents occurred under heterogeneous conditions on dispersions of powdery chitin while those using alkali chitin solutions proceeded in solution.
Keisuke Kurita +2 more
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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).
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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).
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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
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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
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Chitin and Chitosan Fragments Responsible for Plant Elicitor and Growth Stimulator.
Journal of Agricultural and Food Chemistry, 2020Chitin and chitosan are natural polysaccharides with huge application potential in agriculture, such as promoting plant growth, eliciting plant resistance against biotic and abiotic stress, and activating symbiotic signaling between plants and beneficial
Kecheng Li +3 more
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1973
Publisher Summary The chapter focuses on Chitin, which is N-acetyl-2-aminocellulose or more specifically, 2-acetamido-2-deoxycellulose. It is composed of N-acetyl-D-glucosaminyl units linked β-D-(1 → 4). In the same way, D-glucopyranosyl units are linked in the cellulose molecule as a linear array and with a molecular weight of 2–3 million Daltons ...
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Publisher Summary The chapter focuses on Chitin, which is N-acetyl-2-aminocellulose or more specifically, 2-acetamido-2-deoxycellulose. It is composed of N-acetyl-D-glucosaminyl units linked β-D-(1 → 4). In the same way, D-glucopyranosyl units are linked in the cellulose molecule as a linear array and with a molecular weight of 2–3 million Daltons ...
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International Journal of Peptide and Protein Research, 1996
The use of chitin as a support for solid‐phase peptide synthesis is described and illustrated by synthesis of four peptides, varying in length from 10 to 29 residues. Syntheses were performed in a continuous‐flow peptide synthesizer, using Fmoc chemistry.
Neugebauer, W. +4 more
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The use of chitin as a support for solid‐phase peptide synthesis is described and illustrated by synthesis of four peptides, varying in length from 10 to 29 residues. Syntheses were performed in a continuous‐flow peptide synthesizer, using Fmoc chemistry.
Neugebauer, W. +4 more
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Advances in Functional Chitin Materials: A Review
ACS Sustainable Chemistry and Engineering, 2019Chitin is a promising natural polymer to produce functional materials due to the attractive combination of abundance, price, favorable biological properties, and biodegradability. However, multiple literature examples often confuse processing of chitosan,
Julia L. Shamshina +2 more
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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.
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