Synthesis of Guanidyl Acetic Acid Chitosan And Preservation Effect of Cucumbers

Abstract

Abstract:

Guanidyl acetic acid chitosan (GAAC) has been synthesized by self-made chitosan and chloro-guanidinyl acetate as raw materials and was used as cucumber preservative. The results from experiment indicated average molecular weight of guanidyl acetic acid chitosan prepared from chitosan with deacetylation of 96% was 5287 g/mol. Effects of coating with a series of different deacetylation of GAAC as fresh-keeper for cucumber stored at room temperature had been examined. Weight-loss rate slowed down gradually with increase of chitosan deacetylation. Consistency of total chlorophyll increases first and then decreases gradually while storage period lapses. In contrast, concentration of vitamin C declines slightly while storage duration prolongs. When storage duration of GAAC prepared from chitosan with deacetylation of 96% is 35 d, weight-loss rate is about 0.7%; storage duration: 20 d, concentration of total chlorophyll still amounts to 1.34 mg/g; while consistency of vitamin C can retain 0.18 mg/g, storage duration 20 d.

Key words: guanidyl acetic acid chitosan (GAAC), cucumber, coating film, fresh-keeping

CLC Number:

O636.1

ZENG Han, ZHAO Shu-xian, ZHANG Lei, WANG Yong-jiang. Synthesis of Guanidyl Acetic Acid Chitosan And Preservation Effect of Cucumbers[J]. NATURAL PRODUCT RESEARCH AND DEVELOPMENT, 2011, 23(3): 504-507.

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