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Starter Culture Activity in Refrigerated Fermented Soymilk

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The refrigerated shelf life of soymilk fermented with single cultures of Lactobacillus fermentum, L. casei, Streptococcus salivarius subsp. thermophilus, and Bifidobacterium longum was evaluated. During storage at 4°C for 28 days, the stability of the microflora differed markedly among the starter cultures. After 28 days, the average numbers of S. salivarius subsp. thermophilus decreased by two log cycles to 6.0 × 107 CFU/ml, whereas those of L. casei increased gradually by more than two log cycles to 4.6 × 109 CFU/ml. Numbers of B. longum and L. fermentum remained moderately high (8.7 × 108 CFU/ml and 3.7 × 108 CFU/ml, respectively) even after 28 days of storage. S. salivarius subsp. thermophilus and L. casei continued to metabolize sucrose during the storage period, but the pattern of consumption was different among the strains. The other starter cultures did not seem to have significant activity (P > 0.05) on the residual sugars. In most cases, L(+)-lactate predominated.

Document Type: Research Article

Affiliations: Centro de Referencia para Lactobacilos, Chacabuco 145, 4000 Tucumán, Argentina

Publication date: July 1, 1999

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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