Abstract
Objectives
This research paper was to investigate the influence of soybean peptides addition on viable count of lactic acid bacteria, physicochemical parameters, flavor, and sensory evaluation of yoghurt.
Results
The number of fermenting strains (Streptococcus thermophilus + Lactobacillus delbrueckii subsp. bulgaricus) cells in yoghurt (stored at 4 °C for 19 days) added with 0.2% (w/v) of soybean peptides (808.34 Da) reached 1.4 times higher bacterial number than in the control group. A total of 34 volatile substances were detected in this study, while there were 22 volatiles occurred in the control group yoghurt, 30 volatiles were detected in yoghurt added with 0.2% soybean peptides. There was no significant difference in sensory evaluation (p > 0.05) between the yoghurt with and without soybean peptides.
Conclusions
In our study, the addition of soybean peptides (0.2%) can be effective both in maintaining the viable bacterial count and yoghurt quality.
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Supporting information
Supplementary Table 1—Scheme of yoghurt sensory evaluation standards
Supplementary Table 2—Elution procedure for amino acids measurement by HPLC
Funding
This work was supported by National Key R&D Program of China (2016YFD0400401, 2018YFC1604205) and the Research Foundation for Youth Scholars of Beijing Technology and Business University.
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Conceptualization and Methodology: All authors; Formal analysis and investigation: Y.H.; Writing—original draft preparation: Y.L.; Writing—review and editing: All authors; Funding acquisition: X.L.; Resources: X.L.; Supervision: Y.L. and X.L.
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Hu, Y., Li, Y. & Liu, X. Soybean peptides promote yoghurt fermentation and quality. Biotechnol Lett 42, 1927–1937 (2020). https://doi.org/10.1007/s10529-020-02912-2
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DOI: https://doi.org/10.1007/s10529-020-02912-2