期刊
FOOD RESEARCH INTERNATIONAL
卷 42, 期 8, 页码 941-948出版社
ELSEVIER
DOI: 10.1016/j.foodres.2009.05.008
关键词
Soy protein isolate; Sodium caseinate; Myofibrillar protein; Transglutaminase; Cold-set gels
资金
- Biotechnology Research Institute, Chonnam National University
The influence of soy protein isolate (SPI) substitution for sodium caseinate (SC) on the properties of cold-set (4 degrees C) and heat-induced gels of pork myofibrillar protein (MP) incubated with microbial transglutaminase (TG) was investigated. The strength of cold-set MP-SC gels (formed in 0.45 M, NaCl, 50 mM phosphate buffer, pH 6.25) increased with time of TG incubation, but those gels with more than 66% SPI substituted for SC had a >26% reduced strength (P < 0.05). Upon cooking, both incubated and non-incubated protein sols were quickly transformed into highly elastic gels, showing up to 6000 Pa in storage modulus (G') at the final temperature (72 degrees C). However, no differences (P < 0.05) in G' were observed between heated samples with SPI and SC. Myosin heavy chain, casein and soy proteins gradually disappeared with TG incubation, contributing to MP gel network formation. Both cold-set and heat-induced gels had a compact protein matrix, attributable to protein cross-linking by TG. (C) 2009 Elsevier Ltd. All rights reserved.
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