The effect of water activity on growth and end-product formation of two Lactobacillus spp. and Brochothrix thermosphacta ATCC 11509T |
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Authors: | Elisabeth Blickstad |
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Institution: | (1) Swedish Meat Research Institute, P.O. Box 504, S-244 00 Kävlinge, Sweden |
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Abstract: | Summary The effect of water activity (aw) on the growth and end-product formation of Lactobacillus viridescens SMRICC 174, Lactobacillus SMRICC 173 (homofermentative) and Brochothrix thermosphacta ATCC 11509T was studied. All strains orginated from meat or meat products. The aw was adjusted in the range 0.94–0.99 with NaCl or glycerol. A greater reduction in growth rates was found for L. viridescens and B. thermosphacta when aw was regulated with NaCl rather than with glycerol, the opposite was true for Lactobacillus 173. L. viridescens grew at aw >-0.94. At 0.94 aw
B. thermosphacta was totally inhibited when NaCl was the solute and Lactobacillus 173 when glycerol was the solute. Only minor variations in the end-product formation of the Lactobacillus spp. were found at different aw values. In aerobic culture B. thermosphacta produced less l-lactic acid and more acetic acid as the aw was decreased with NaCl, while the yields were unaffected when glycerol was used. |
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