Abstract
Seawater bittern (nigari) is a concentrated solution remaining after the crystallization process of salt that has been used as a coagulant for tofu. Recently, various nigari products are distributed in the East Asia. To clarify the properties of nigari products, major mineral composition of six nigari products was determined. Then, effects of the nigari on the browning and antioxidant activity during the glucose/lysine Maillard reaction were investigated. Though the predominant cation was Mg2+, the content was varied by each product (0.88–6.49 mol/L). The other major ion contents were also varied. Each 0.5 mol/L of d-glucose and l-lysine were incubated with the nigari (5–50 % (v/v)) or nigari-related salts (1 or 2 mol/L). The browning (OD at 465 nm) and antioxidant activity (1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging capacity and ferrous-reducing power) were increased remarkably by the nigari containing high Mg2+ content. The browning tended to be high with sulfates (Na2SO4, (NH4)2SO4). On the other hand, high content of MgCl2 decreased slightly the browning and antioxidant activity. These results suggest that the reaction and antioxidant activities were affected not only by salinity and cations but also by anions and other elements in the nigari.
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This work was supported by the Salt Science Research Foundation (Grant No. 0740), Tokyo, Japan.
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Kuda, T., Yano, T. Mineral Composition of Seawater Bittern Nigari Products and Their Effects on Changing of Browning and Antioxidant Activity in the Glucose/Lysine Maillard Reaction. Appl Biochem Biotechnol 172, 2989–2997 (2014). https://doi.org/10.1007/s12010-013-0722-0
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DOI: https://doi.org/10.1007/s12010-013-0722-0