Title of article :
Preparation of N-vanillyl chitosan and 4-hydroxybenzyl chitosan and their physico-mechanical, optical, barrier, and antimicrobial properties
Author/Authors :
Jagadish، نويسنده , , R.S. and Divyashree، نويسنده , , K.N. and Viswanath، نويسنده , , Prema and Srinivas، نويسنده , , P. and Raj، نويسنده , , Baldev، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
7
From page :
110
To page :
116
Abstract :
Chitosan derivatives such as N-vanillyl chitosan and 4-hydroxybenzyl chitosan were prepared by reacting chitosan with 4-hydroxy-3-methoxybenzaldehyde (vanillin) and 4-hydroxybenzaldehyde. Amino groups on chitosan reacts with these aldehydes to form a Schiff base intermediate, which is later on converted into N-alkyl chitosans by reduction with sodium cyanoborohydride. The chemical reaction was monitored by 1H NMR spectroscopy and the absence of aldehydic proton at 9.83 ppm in NMR spectra was observed for both the modified chitosan derivatives confirming the reaction. Modified chitosan films were later prepared by solution casting method and their physico-mechanical, barrier, optical and thermal properties were studied. The results clearly indicated significant change in tensile strength, water vapour transmission rate, and haze properties of modified chitosans. Modified chitosan films were also studied for their antimicrobial activity against Aspergillus flavus. The results showed a marked reduction of aflatoxins produced by the fungus in the presence of the N-vanillyl chitosan and 4-hydroxybenzyl chitosan film discs to 98.9% and non-detectable levels, respectively.
Keywords :
antifungal properties , Chitosan derivatives , 4-Hydroxy-3-methoxybenzaldehyde (vanillin) , 1H NMR , 4-Hydroxybenzaldehyde , tensile strength , WVTR
Journal title :
CARBOHYDRATE POLYMERS
Serial Year :
2012
Journal title :
CARBOHYDRATE POLYMERS
Record number :
1623065
Link To Document :
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