Effect of 7S/11S ratio on the physicochemical properties of soy protein isolate-linoleic acid films

IF 6 1区农林科学 Q1 FOOD SCIENCE & TECHNOLOGY

LWT - Food Science and Technology Pub Date : 2025-03-04 DOI:10.1016/j.lwt.2025.117610

Rongxue Zhou, Yuan Zhao, Linfan Shi, Zhongyang Ren, Wuyin Weng

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Abstract

The effect of 7S/11S ratio on the physicochemical properties of soy protein isolate (SPI) and SPI-linoleic acid (LA) films was studied. The apparent viscosity in the film-forming solution and the oil droplet size in the film-forming emulsion increased with increasing 11S globulin ratio. The oil droplets in the SPI-LA films increased in number and floated to the surface when the 7S/11S ratio was 2:6. The tensile strength (TS) and elongation at break (EAB) of 7S globulin films were 9.45 MPa and 94.51%, respectively. The increase in the 11S globulin ratio increases the TS of SPI and SPI-LA films; however, their EAB did not change. As the 7S/11S ratio decreased, the water vapor transmittance of the SPI films and the SPI-LA films decreased, but their glass transition temperature and transparency values increased. The proportion of hydrogen bonds and non-disulfide covalent bonds in the SPI films and the SPI-oil films reduced with the increase in the 11S globulin ratio, whereas that of disulfide bonds and hydrophobic interactions increased. This study clarified the effect of 7S/11S ratio on the properties of SPI and SPI-LA films, providing the theoretical guidance for selecting suitable SPI for the preparation of edible films.

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来源期刊

LWT - Food Science and Technology 工程技术-食品科技

CiteScore

11.80

自引率

6.70%

发文量

1724

审稿时长

65 days

期刊介绍： LWT - Food Science and Technology is an international journal that publishes innovative papers in the fields of food chemistry, biochemistry, microbiology, technology and nutrition. The work described should be innovative either in the approach or in the methods used. The significance of the results either for the science community or for the food industry must also be specified. Contributions written in English are welcomed in the form of review articles, short reviews, research papers, and research notes. Papers featuring animal trials and cell cultures are outside the scope of the journal and will not be considered for publication.