ISSN:
1750-3841
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Acid production was determined in cultures of Streptococcus thermophilus and Lactobacillus bulgaricus in the presence of penicillin and gentamycin in milks with water activity adjusted between 0. 992 and 0.943 by adding glycerol, glucose or sucrose. Resistance of S. thermophilus A TCC 19258 and CRL 410 to penicillin increased when aw was lowered with glycerol from 0.992 to 0.995, and from 0.992 to 0.985 in L. bulgaricus ATCC 11842. Susceptibility to gentamycin increased in both species with reduction of aw. Susceptibility of S. thermophilus CRL 410 to penicillin increased in most cases when aw was adjusted with glucose, while acid production at a aw of 0.985 was always higher than that of the controls (aw 0.992) when sucrose was used. With L. bulgaricus CRL 420, lower acid production was observed at all penicillin concentrations, whether glucose or sucrose was used as the humectant.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2621.1989.tb07913.x
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