Viability of Bifidobacterium lactis and Lactobacillus acidophilus in milk: Sodium chloride concentration and storage temperature

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Gomes, AMP (Author) Other; Teixeira, MGM (Author) Other; F. Xavier Malcata (Author) Other

Journal

Title: Journal of Food Processing and Preservation

Vol. 22

Pages: 221-240

ISSN: 0145-8892

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 16 Citations

Other information

Authenticus ID: P-001-7CB

DOI: 10.1111/j.1745-4549.1998.tb00347.x

Abstract (EN): The growth and viability of Bifidobacterium lactis and Lactobacillus acidophilus per se and for both strains as a coculture were studied in reconstituted skim milk so as to assess their dependence upon temperature (5, 10 and 15C), NaCl concentration (0, 0.51 and 1.03 mol L-1), and storage time (0-8 weeks). Cultures of B. lactis exhibited no significant loss of viability either with increasing NaCl concentration or increasing storage temperature within the ranges studied. On the other hand, viability of L. acidophilus decreased with increasing temperature and increasing NaCl concentration under similar conditions. When cocultured with L. acidophilus, B. lactis was significantly less tolerant to higher NaCl levels and higher temperatures than when in pure culture, although final numbers were still above the threshold required for commercial application. Coculturing with B. lactis had no detrimental effect on viability oft. acidophilus. A mechanistic model, which considers the behavior of the pure and mired microbial populations is described by specific death rates which vary with temperature (following Arrhenius relationships) and NaCl levels (following simple inhibition kinetics) in the milk medium. Activation energies for the death rates of B. lactis and L, acidophilus were 14 kcal mol(-1) and 9-15 kcal mol(-1), respectively.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 20