Screening of Optimal Strain for Microbial Preparation of ACE Inhibitory Peptides from Soybean Protein Isolate

Abstract

Abstract: To screen the optimal strain for microbial preparation of ACE inhibitory peptides from soybean protein isolate (SPI), the effects of different strains including 5 Lactobacillus strains, 3 mould strains and 1 Bacillus subtilis strain on ACE inhibitory rate and peptide concentration were investigated. Lactobacillus bulgaricus was found to be the best of five 5 Lactobacillus strains for the preparation of ACE inhibitory peptides from SPI, providing an ACE inhibitory rate of 57.93% and a peptide concentration of 3.27 mg/mL. A. oryzae was the best mould, providing an ACE inhibitory rate of 41.23% and a peptide concentration of 2.17 mg/mL. Bacillus subtilis fermented SPI showed an ACE inhibitory rate of 45.02% and a peptide concentration of 2.25 mg/mL. Comparing the fermentation characteristics of 9 strains, Lactobacillus bulgaricus was an excellent strain for the preparation of ACE inhibitory peptides from SPI.

Key words: microbial fermentation, ACE inhibitory peptides, soybean protein, ACE inhibitory activity

CLC Number:

TS214.2

References

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