Effect of Molecular Weight, Acid, and Plasticizer on the Physicochemical and Antibacterial Properties of β-Chitosan Based Films

被引:67
作者
Chen, Jeremy L. [1 ]
Zhao, Yanyun [1 ]
机构
[1] Oregon State Univ, Dept Food Sci & Technol, Corvallis, OR 97331 USA
关键词
beta-Chitosan films; antibacterial activity; mechanical properties; monocarboxylic acid; plasticizer; water vapor permeability; ALPHA-CHITIN; ANTIMICROBIAL PROPERTIES; EDIBLE FILMS; SQUID CHITIN; SOLID-STATE; DEACETYLATION; BEHAVIOR; PENS; PERMEABILITY; CONVERSION;
D O I
10.1111/j.1750-3841.2012.02686.x
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
Effects of chitosan molecular weight (1815 and 366 kDa), type of acid (1% acetic, formic, and propionic acid, or 0.5% lactic acid) and plasticizer (0, 25% glycerol or sorbital w/w chitosan) on the mechanical, water barrier, and antibacterial properties of beta-chitosan films were investigated. Tensile strength (TS) of high molecular weight (Hw) films was 53% higher than that of low molecular weight (Lw) ones, acetate, and propionate films had the highest TS (43 and 40 MPa) among tested acids, and plasticizer-reduced film TS 34%. Film elongation at break (EL) was higher in Hw films than in Lw ones, in which formate and acetate films were the highest (9% and 8%, respectively), and plasticizer increased the film EL 128%. Molecular weight of chitosan did not influence water vapor permeability (WVP) of the films. Acetate and propionate films had lower WVP than other acid types of films, and plasticizer increased film WVP about 35%. No difference was found between glycerol and sorbitol films in terms of film mechanical and water barrier properties. Lw beta-chitosan films showed significant antibacterial activity against E. coli and L. innocua. This study demonstrated that beta-chitosan films are compatible to a-chitosan films in physicochemical properties and antibacterial activity, yet with simple sample preparation.
引用
收藏
页码:E127 / E136
页数:10
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