ε-聚赖氨酸与羧甲基纤维素钠的相互作用

Interaction between Sodium Carboxymethyl Cellulose and ε-Polylysine

以ε-聚赖氨酸(ε-polylysine,ε-PL)与羧甲基纤维素钠(sodium carboxymethylcellulose,CMC-Na)相互作用体系的混浊度、Zeta电位和粒度为指标,研究了CMC-Na的取代度(degree of substitution,DS)和相对分子质量对ε-PL/CMC-Na相互作用体系的影响。结果表明,在p H 4.0时,ε-PL与CMC-Na之间的静电相互作用主要依赖于ε-PL氨基与CMC-Na羧基的物质的量比;同时,CMC-Na的取代度和相对分子质量均对ε-PL/CMC-Na相互作用具有显著影响,且CMC-Na取代度对体系稳定性的影响更大。

The interaction between food ingredients is one of the research focuses in food science. ε-Polylysine（ε-PL）, as a food additive, is a cationic polyelectrolyte with excellent antimicrobial properties, and it can interact with anionic polymers such as sodium carboxymethylcellulose（CMC-Na） to affect its antimicrobial properties and the stability of related food systems. In this study, the effects of degree of substitution（DS） and molecular weight of CMC-Na on the interaction between ε-PL and CMC-Na as indicated by turbidity, Zeta potential and particle size were investigated. Results revealed that the electrostatic interaction between ε-PL and CMC-Na mainly depended on the molar ratio of cationic amino groups in ε-PL to carboxyl anion groups in CMC-Na. In addition, both DS and molecular weight of CMC-Na exerted a serious i mpact on the interaction between ε-PL and CMC-Na and the effect of DS was more significant.