Some N-arylidenechitosan gels

Hirano, Seishiro; Matsuda, Noriaki; Miura, Osamu; Iwaki, Hideyuki

doi:10.1016/s0008-6215(00)86085-1

Cited by 45 publications

(9 citation statements)

References 9 publications

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“…20 The proper amount of aldehyde was chosen from our previous work. 13 The gels, in which enzyme proteins were immobilized by the present method, were slightly yellow and were insoluble in cold and boiling water, aqueous alkali, and the common organic solvents examined. The gels did not melt on heating up to 200°C.…”

Section: Resultsmentioning

confidence: 89%

Alkaline phosphatase and pepsin immobilized in gels

Hirano

Miura

1979

Biotech & Bioengineering

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Section: Resultsmentioning

confidence: 89%

Alkaline phosphatase and pepsin immobilized in gels

Hirano

Miura

1979

Biotech & Bioengineering

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“…This is presumably a result of the relatively short experimental time scale involved (minutes) which would be insufficient for any substantial chclation to occur (23 ( 1 8) and other selective derivatization (6, 9) procedures for chitin and chitosan, which together provide a versatile array of synthetic techniques for further evaluations of the physical properties of these biopolyniers. These methods have facilitated, for the first time, spectroscopic studies of chitosan and its derivatives in both the solution and gel form in aquco~ls medium, whereas previous investigations involved either chitosan films suspended in organic solvents (4) or solutions in aqueous organic acids (3,5).…”

Section: Discussionmentioning

confidence: 99%

“…Hirano et 01. (3) have observed pronounced changes in specific rotation of chitosan during Schiff's base formation and the attendant gelation process. More recently, Komai and co-workers (4) have studied the molecular motions of a spin-probe in films of various acylchitins, while Aleksandrova et 01.…”

Section: Introductionmentioning

confidence: 99%

Some chemical and analytical aspects of polysaccharide modifications. IV. Electron spin resonance studies of nitroxide-labelled chitin and chitosan derivatives

Yalpani¹,

Hall²

1984

Can. J. Chem.

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Nitroxide spin labels have been attached to chitin, chitosan, and their derivatives in order to investigate the solution and gel characteristics of these polymers. Thus, chitin was nonselectively acylated using the chloroacetamide label 3 to afford. the corresponding nitroxide derivative 4. Selective and nonselective labelling of chitosan was accomplished either via reductive alkylation using the keto label 5 and sodium cyanoborohydride or via a chitosan sulfate intermediate using labels 3 or 5. Two branched water soluble chitosan derivatives, carrying C-6 oxidized, terminal galactose side chains were selectively labelled by reductive animation using the amine label 13 to yield derivatives 14 and 15. Motional correlation values of the covalently-linked nitroxide moieties were shown to reflect the nature of the linkage between spin label and polymer, as well as structural differences between the branch residues of derivatives 14 and 15. The spin-probe – spin-label method was employed to demonstrate structural heterogeneities for the chitosan derivatives 7 and 15.

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“…16 After chitosan flakes were broken into smaller pieces, chitosan particles with a diameter of 100 -300 µm were collected with a sieve. After amino groups of the chitosan were protected by benzaldehyde, 18 the hydroxyl groups at the 6-position of chitosan were cross-linked with ethylene glycol diglycidyl ether (EGDE). Deprotection of amino groups was carried out with hydrochloric acid.…”

Section: Synthesis Of Cross-linked Chitosanmentioning

confidence: 99%