Migration of Antimicrobial Silver from Composites of Polylactide with Silver Zeolites

被引：108

作者：

Fernandez, Avelina ^{[1
]}

Soriano, Eva ^{[1
]}

Hernandez-Munoz, Pilar ^{[1
]}

Gavara, Rafael ^{[1
]}

机构：

[1] CSIC, Inst Agroquim & Tecnol Alimentos, Burjassot 46100, Spain

来源：

JOURNAL OF FOOD SCIENCE | 2010年 / 75卷 / 03期

关键词：

antimicrobial packaging; food safety; migration; PLA; silver ion technology; silver zeolites; NANOPARTICLES;

D O I：

10.1111/j.1750-3841.2010.01549.x

中图分类号：

TS2 [食品工业];

学科分类号：

0832 ;

摘要：

Silver ion migration and antimicrobial activity of PLA (polylactic acid-polylactide)/silver zeolite composites were investigated. Films prepared by solution-casting/solvent evaporation, or by melt-mixing/compression molding were compared. Silver migration to food simulants and TSB (tryptone soy broth) was quantified at different temperatures. Antimicrobial activity against Staphylococcus aureus and Escherichia coli was measured following the Japanese Industrial Standard JIS Z 2801. All types of PLA/silver zeolite composites released Ag+ ions. A more intense ionic exchange with the zeolites and a significant, but low, antimicrobial activity in solution were found in cast films. To attain antimicrobial effects, however, migrated ions ought to be in the range of the legal limit of 0.05 mg Ag+/kg food stated by the European Food Safety Agency (EFSA). Silver migration and antimicrobial activity were sensitive to the methodology chosen to process the PLA films, the ionic strength of the medium, and the ion motility in the polymer matrix. Practical Application: Silver exchanged zeolites incorporated in food contact polymers are gaining importance as antimicrobial agents. Migration of silver ions from polymer matrices, however, is legally restricted. Therefore a compromise between silver migration and antimicrobial activity needs to be critically analyzed to validate novel materials in food packaging applications.

引用

页码：E186 / E193

页数：8

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