Abstract
Strains of Lactobacillus delbrueckii ssp. bulgaricus, Lactobacillus helveticus, Lactobacillus acidophilus, and Streptococcus thermophilus varied in their ability to grow in whey permeate-based media. Whey permeate alone was a poor medium with a relatively low buffering capacity, which supported the growth of L. delbrueckii ssp. bulgaricus and S. thermophilus only. External pH control and the addition of .1% nonfat dry milk solids and .5 to 1% yeast extract improved the growth and activity of L. delbrueckii ssp. bulgaricus, L. helveticus, and S. thermophilus and made whey permeate-based media comparable with 11% nonfat dry milk as a medium for thermophilic lactic acid starters. Internal pH control, using a phosphate buffer, did not significantly improve the growth of the strains used when compared with the unbuffered medium and was inhibitory to L. helveticus 880.
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