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• W2012256493 abstract "The stability of the solutions of partially N-acetylated chitosans was studied by two methods: (1) 1% solutions of the chitosan derivatives in 0.1 m aqueous acetic acid were added dropwise to buffer solutions with pH from 8.6 to 12 and to a 0.1 m NaOH solution; (2) to each 0.5% solution of the derivatives in 0.1 m acetic acid was added the desired amount of a 1 m NaOH solution. The stability data obtained were summarized with respect to the degree of N-acetylation. It was found that the solutions of the derivatives with more than 50% acetyl content were stable even in alkaline conditions and the gelation and precipitation of the solutions did not occur. The reactivity of the derivatives with the degree of N-acetylation of more than 50% was studied using methyl 4-azidobenzoimidate (M ABI) and ethylene glycol diglycidyl ether in homogeneous states. It was found that M ABI reacted with amino groups of the chitosans only at neutral pH and glycidyl groups reacted at neutral and alkaline pH. It seems that these unique properties of chitosan with a degree of N-acetylation of more than 50% will enable us to prepare new chitosan derivatives." @default.
• W2012256493 created "2016-06-24" @default.
• W2012256493 creator A5031095136 @default.
• W2012256493 date "1989-08-01" @default.
• W2012256493 modified "2023-10-14" @default.
• W2012256493 title "Studies on chitosan: 2. Solution stability and reactivity of partially N-acetylated chitosan derivatives in aqueous media" @default.
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• W2012256493 doi "https://doi.org/10.1016/0141-8130(89)90077-9" @default.
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