Effects of EDC and NHS on Physical Properties of Zein Films

doi:10.7506/spkx1002-6630-201401003

Abstract

Abstract:

The effects of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxysuccinimide (NHS) as crosslinking
reagents on the structure and properties of zein films were investigated to find ways to improve the tensile strength and
elongation and reduce the water vapor permeability and moisture absorption. Results showed that films prepared with 90% ethanol
as the solvent and 0.06 g of EDC/g zein or 0.06 g of NHS/g zein exhibited the best properties. The tensile strength, elongation,
water vapor permeability, moisture absorption and weight loss were 83 MPa, 5.5%, 2.5 × 10-8 (g·m)/ (m2·h·Pa), 39.4% and
3.6%, which were increased by 97.6%, 57.1%, reduced by 43.2% and 24.4%, and enhanced by 20.0% compared to those without
added cross-linking reagent, respectively, and the static water contact angle of the experimental samples was 67.4°, indicating the
film surface to be hydrophobic. In addition, the surface of zein films containing EDC and NHS was arranged orderly and closely as
smaller uniform spherical aggregates as observed using atomic force microscope (AFM)

Key words: 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC), N-hydroxysuccinimide (NHS), zein, film properties

CLC Number:

TQ321.4

ZHANG Min, CHEN Ye*, LIU Jun, ZHOU Shu-hong, WANG Jun-yu, LI Yan-dan. Effects of EDC and NHS on Physical Properties of Zein Films[J]. FOOD SCIENCE, 2014, 35(1): 12-17.

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