Main Article Content

Felix Widodo Diana Lo

Abstract

Tempeh can be processed into soy sauce to enhance its functional value. The sauce must go through a pasteurization process that may impact its qualities. Therefore, this study aims to determine the effect of pasteurization (70℃ for 15 min) and fermentation time (up to 4 d) on the physico-chemical properties, antioxidant capacity and total phenolic content of tempeh-based soy sauce. The soy sauce was produced through moromi fermentation lasting up to 8 weeks, with tempeh fermentation periods 2, 3 and 4 d tested alongside koji as the control. Results indicated that pasteurization and fermentation time significantly increased the antioxidant capacity (EC50) of tempeh-based soy sauce up to 1.91±0.18 mg soy sauce/mL (p<0.05). Total phenolic content significantly decreased to 897±3 µg gallic acid equivalent.mL-1 after pasteurization, while the fermentation time significantly increased total phenolic content (p<0.05). The total dissolved solids and total soluble protein increased with the fermentation time (p<0.05). The L*, a*, b* and the total soluble protein decreased after pasteurization (p<0.05). Consequently, fermentation time positively affected the physico-chemical characteristics, total phenolic content and antioxidant capacity of tempeh-based soy sauce, while pasteurization increased the antioxidant capacity and darkened the color of the soy sauce but decreased total phenolic content.

Article Details

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How to Cite
WIDODO, Felix; LO, Diana. Effect of pasteurization and fermentation time on physicochemical properties, antioxidant capacity, and total phenolic content of tempeh-based soy sauce. Food Science and Applied Biotechnology, [S.l.], v. 8, n. 1, p. 1-10, mar. 2025. ISSN 2603-3380. Available at: <https://www.ijfsab.com/index.php/fsab/article/view/414>. Date accessed: 20 apr. 2025. doi: https://doi.org/10.30721/fsab2025.v8.i1.414.