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Fermentation process optimization, chemical analysis, and storage stability evaluation of a probiotic barley malt kvass

Abstract

Kvass is a popular low-alcohol beverage produced by the natural fermentation of dark rye bread or malt with complex microbial flora. However, few pieces of research focus on the microflora of traditional bread kvass, and the industrial kvass based on malt concentrate has some disadvantages, including the lack of viable probiotics and containing multiple artificial additives. Therefore, in the present study, based on the different homemade traditional bread kvass, the predominant species including Lacticaseibacillus paracasei, Acetobacter pasteurianus, and Saccharomyces cerevisiae were screened and identified. In addition, barley malt was used instead of bread for kvass production, and the co-fermentation conditions with three different strains were optimized as wort concentration of 7.4°Brix, cell ratio of 2/2/1 (S. cerevisiae/L. paracasei/A. pasteurianus), inoculum amount of 8%, fermentation temperature of 29.5 °C and fermentation time of 24.6 h. Moreover, the physicochemical (pH, total soluble solids, color, and alcohol content) and probiotic (microorganisms counting and antioxidant activity) properties of the barley malt kvass prepared at optimal conditions were symmetrically evaluated. Besides, compared with the commercial kvass products, the produced barley malt kvass exhibited better taste and more desirable antioxidant activity, and also maintained around 6–7 log CFU/mL of viable probiotic microorganisms during a week of storage. The present study not only enriched the biological resource of the traditional kvass, but also promoted the development of the kvass as a live-bacteria beverage.

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Acknowledgements

The author thanks the financial support of the Keypoint Research and Invention Program of Shannxi Province (No. 2021ZDLNY05-06), National Natural Science Foundation of China (No. 32001652) and Central Guiding Fund for Local Science and Technology Development (No. 2021Szvup118).

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Wang, P., Wu, J., Wang, T. et al. Fermentation process optimization, chemical analysis, and storage stability evaluation of a probiotic barley malt kvass. Bioprocess Biosyst Eng 45, 1175–1188 (2022). https://doi.org/10.1007/s00449-022-02734-8

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  • DOI: https://doi.org/10.1007/s00449-022-02734-8

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