Enhancing organic selenium content and antioxidant activities of soy sauce using nano-selenium during soybean soaking.

Abstract

Nano-selenium has a greater potential than inorganic selenium in preventing selenium-deficiency diseases due to its higher safety. In this study, spherical nano-selenium particles (53.8 nm) were prepared using sodium selenite, ascorbic acid and chitosan. Selenium-enriched soy sauces were prepared by soaking soybean in nano-selenium and sodium selenite solutions (2-10 mg/L), respectively. Total selenium and organic selenium contents of soy sauces prepared by nano-selenium and sodium selenite were increased by 32-191-fold and 29-173-fold compared to the control (without selenium), and organic selenium accounted for over 90% of total selenium. Soy sauce prepared using 6 mg/L nano-selenium had the strongest antioxidant activities, which were 9.25-28.02% higher than the control. Nano-selenium (6 mg/L) markedly enhanced the koji's enzyme activities (9.76-33.59%), then the latter promoted the release of total phenolics (27.54%), total flavonoids (27.27%) and the formation of free amino acids (16.19%), Maillard reaction products (24.50%), finally the antioxidant activities of selenium-enriched soy sauce were enhanced.

• Authors: Jingru Chen, Tuo Feng, Bo Wang, Ronghai He, Yanling Xu, Peipei Gao, Zhi-Hong Zhang, Lei Zhang, Jiangyan Fu, Zhan Liu, Xianli Gao
• Journal: Frontiers in nutrition (Front Nutr) Vol. 9 Pg. 970206 ( 2022) ISSN: 2296-861X [Print] Switzerland
• PMID: 36051904 (Publication Type: Journal Article)
• Copyright: Copyright © 2022 Chen, Feng, Wang, He, Xu, Gao, Zhang, Zhang, Fu, Liu and Gao.