Crystalline Features of Chitosan-L- and D-Lactic Acid Salts

スポンサーリンク

概要

• 論文の詳細を見る

• The crystal structures of chitosan-L- and D-lactate salts were studied by X-ray diffraction measurements on fiber diagrams. In each lactate, chitosan took on a different crystalline polymorph depending on the preparation temperature. At low temperature, they gave a similar fiber pattern to that of the type II salt which has been found to be one of the two forms of chitosan acid salts in which the backbone chitosan molecules take on an eight-fold helix. At high temperature, however, the fiber pattern was that of the type I salt, another from of chitosan salt in which the backbone chains apparently retain the 2_1 symmetry of chitosan itself. The high-temperature polymorph of the L-lactate was a monoclinic (pseudoorthorhombic) unit cell whose lattice parameters were a=10.51,b=10.85,c(fiber axis)=10.34 Å and γ=90°. That of the D-lactate was also a monoclinic cell having parameters a=11.20,b=11.60,c (fiber axis)=10.38 Å and γ=93.0°. Their unit cell volumes coupled with their observed density values indicate that two chains of chitosan lactate were accommodated in each unit cell, that the L-lactate was an anhydrous crystal, but that the D-lactate was hydrated. The preparation temperature at which the salt changed from type II to type I was different between the D- and L-lactate, suggesting that these acids had different affinity to the chitosan molecule. When chitosan powder was suspended in a racemic lactic acid solution, the resultant solution always showed a minus sigh for the rotation angle, indicating that D-lactic acid had higher affinity to chitosan than the L-isomer.

• 社団法人日本農芸化学会の論文
• 1998-04-23

著者

• Ogawa K

  Department Of Citrus Research National Institute Of Fruit Tree Science

• Abe Yasuo

  Research Institute For Advanced Science And Technology Osaka Perfecture University

• Ogawa Kazunori

  Department Of Citrus Research National Institute Of Fruit Tree Science

• Ogawa Kozo

  Research Institute for Advanced Science and Technology, University of Osaka Prefecture

• Okamura K

  Mercian Corporation Central Research Laboratories

• YUI Toshifumi

  Faculty of Engineering, Miyazaki University

• Yui Toshifumi

  Faculty Of Engineering Miyazaki University

• KAWADA Junpei

  Research Institute for Advanced Science and Technology, Osaka Prefecture University

• Kawada J

  Osaka Prefecture Univ. Osaka Jpn

• Ogawa Kozo

  Research Institute For Advanced Science And Technology (riast)

関連論文

• The Homeostasis Model Assessment-insulin Resistance Index Is Inversely Associated with Serum Carotenoids in Non-diabetic Subjects
• Quantitation of Carotenoids in Raw and Processed Fruits in Japan
• cDNA CLONING A COLD-RESPONSIVE GENE FROM SATSUMA MANDARIN (Citrus unshiu Marcov. )
• cDNA Sequence and Expression of a Cold-Responsive Gene in Citrus unshiu
• X-Ray Diffraction Study of Glucomannans and Their Acetates(Analytical Chemistry)
• Characterization of the adsorption of Xyloglucan to Cellulose : STRUCTURE AND FUNCTION OF CELLS
• Analysis of Sensitivity to High Temperature of Torulaspora delbrueckii No.3110
• Accumulation and Role of Trehalose in Torulaspora delbrueckii No.3110
• Fourth 3D Structure of the Chitosan Molecule : Conformation of Chitosan in Its Salts with Medical Organic Acids Having a Phenyl Group(Analytical Chemistry)
• Crystalline Behavior of Chitosan Organic Acid Salts(Analytical Chemistry)
• Dependence of the Mechanical Properties of a Pullulan Film on the Preparation Temperature(Analytical Chemistry)
• Complex Formation of (1→3)-β-D-Glucan with Some Azo Dyes
• Structure and Function of Chitosan (V). Conformations of Ethylene Glycol Derivatives of Chitin and Chitosan
• Dependence of Complex Formation of(1→3)-β-D-Glucan with Congo Red on Temperature in Alkaline Solutions
• Crystalline Features of Chitosan-L- and D-Lactic Acid Salts
• Direct Fermentative Production of Acyltylosins by Genetically-engineered Strains of Streptomyces fradiae
• Cloning and Nucleotide Sequences of Two Genes Involved in the 4''-O-Acylation of Macrolide Antibiotics from Streptomyces thermotolerans
• Application of Cyclodextrin to Microbial Transformation of Vitamin D_3 to 25-Hydroxyvitamin D_3 and 1α, 25-Dihydroxyvitamin D_3
• Preferential and High-Yield Production of a Cephamycin C by Dissolved Oxygen Controlled Fermentation
• Inhibition of RuBisCO Cloned from Thermosynechococcus vulcanus and Expressed in Escherichia coli with Compounds Predicted by Molecular Operation Environment (MOE)(ENZYMOLOGY, PROTEIN ENGINEERING, AND ENZYME TECHNOLOGY)
• Chain Conformation of Deacetylated Beijeran Calcium Salt
• Crystalline Features of Streptococcal (1→3)-α-D-Glucans of Human Saliva
• Conformation of Poly[(1→3)-α-D-Maltotriose], a Major Part of the Elsinan Molecule, Studied by X-Ray Diffraction Coupled with Conformational Analysis
• Nucleotide Sequence Analysis of the Carbomycin Biosynthetic Genes Including the 3-O-Acyltransferase Gene from Streptomyces thermotolerans
• Chronic Administration of Satsuma Mandarin Fruit (Citrus unshiu MARC.) Improves Oxidative Stress in Streptozotocin-Induced Diabetic Rat Liver(Pharmacognosy)
• Effect of Chronic Administration of Fruit Extract (Citrus unshiu Marc.) on Glucose Tolerance in GK Rats, a Model of Type 2 Diabetes
• Conformation of (1→3)-α-D-Glucan Tribenzoate
• Structures of Antafumicins A and B, Novel Antifungal Substances Produced by the Fungus Aspergillus niger NH-401
• Another Photochromism of a Spironaphtoxazine Due to the Geometric isomerization of the Open-Form
• Conformation of an Arabinoxylan Isolated from the Rice Endosperm Cell Wall by X-Ray Diffraction and a Conformational Analysis
• Effect of Explosion on the Crystalline Polymorphism of Chitin and Chitosan
• Dependence on the Preparation Procedure of the Polymorphism and Crystallinity of Chitosan Membranes
• Conformational Behavior of Chitosan in the Acetate Salt : An X-Ray Study
• Macromolecular Complexes of Xyloglucan and Cellulose Obtained by Annealing : STRUCTURE AND FUNCTION OF CELLS
• Viscometry of Curdlan, a Linear (1→3)-β-D-Glucan, in DMSO or Alkaline Solutions
• Crystallinity of Partially N-Acetylated Chitosans
• Molecular Modeling Study of Highly Branching (1→3)-α-D-Glucan, a Model Polysaccharide for Cariogenic Glucan, Using the N-H Mapping Method
• Effect of Heating an Aqueous Suspension of Chitosan on the Crystallinity and Polymorphs(Analytical Chemistry)

もっと見る 閉じる

スポンサーリンク