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The effect of lactic acid bacteria as a starter on the quality of fermented beef-soybean paste

2,Zheng-Yu LONG 2,Dao-bang TANG   

  • Received:2024-05-19 Revised:2024-07-15 Online:2024-08-20 Published:2024-08-20
  • Contact: Dao-bang TANG

Abstract: Abstract:Lactic acid bacteria are expected to improve the quality of compound fermented soybean paste. In this study, four fermented beef-soybean paste samples (CK, Lp, Pp, Lp-Pp ) were prepared with different combinations of Lactobacillus plantrum and Pediococcus pentosaceus, and their physicochemical properties, free amino acids, and volatile flavor compounds were compared. The results showed that the Lactic acid bacteria led to a decrease in the pH value, amino acid nitrogen, and total free amino acid content, an increase in total acid content and reducing sugar, and an increase in the types and contents of volatile flavor compounds of fermented beef-soybean paste. Among them, the group of Lp-Pp contained the most types (17) of ester substances. Through ROAV and OPLS-DA analysis, it was found that the lactic acid bacteria changed the composition of key volatile flavor compounds in fermented beef-soybean paste. The co-inoculation of Lactobacillus plantarum and Streptococcus pentosus (Lp-Pp) promoted the formation of ethyl octanoate, isovaleraldehyde, benzaldehyde, and phenylacetaldehyde in beef-soybean paste, improved the flavor of beef-soybean paste. This study provides a theoretical basis for the production of high-quality compound fermented soybean paste by inoculating lactic acid bacteria.

Key words: Keywords:Compound fermented soybean paste, Lactic acid bacteria, Inoculation, Quality, Key flavor substances

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