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Synergistic fermentation of Lactiplantibacillus plantarum 40 and 42 regulates browning in soybean paste and its
Huilin Ye1, Qu Liu1, Guoyang Pan2
1College of Food Science, Shenyang Agricultural University, Shenyang 110866, PR China.
Abstract:
The color of soybean paste is a crucial sensory attribute for evaluating its quality, with light-colored and color-stable products being more favored in the market. The microbial community plays a significant role in determining color variations in soybean paste; however, the key strains and underlying mechanisms remain unclear. In this study, two lactic acid bacteria strains were isolated from light-colored soybean paste, and their combined application significantly improved the color of fermented soybean paste. Mechanistic investigations revealed that on the one hand, the lactic acid bacteria consumed reducing sugars, thereby decreasing the substrates available for Maillard and caramelization reactions and ultimately inhibiting non-enzymatic browning. On the other hand, the lactic acid bacteria decomposed proteins to produce antioxidant peptides capable of chelating metal ions and scavenging free radicals, thereby suppressing enzymatic browning. This dual-pathway mechanism elucidates how lactic acid bacteria regulate the color of soybean paste and provides theoretical support for the development of anti-browning fermentation agents and targeted color control strategies.
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