Abstract
Five strains each of Actinomyces viscosus, Streptococcus mutans, and Streptococcus mitis were compared for the ability to accumulate acid when grown as colonies on tryptic soy agar (TSA) containing either glucose, sucrose, fructose, lactose or starch. Colony pH was calculated from daily millivolt recordings obtained with a miniature antimony electrode. When grown on TSA containing fermentable carbohydrates, acid accumulation by A. viscosus colonies was greater than that by Strep. mitis colonies and less than that by Strep. mutans colonies. The rate of pH decrease in A. viscosus colonies was slower than that for Strep. mutans. The pH of A. viscosus colonies rose when grown on TSA without added carbohydrate or on TSA containing starch. Relative pH values for A. viscosus, Strep. mutans and Strep. mitis grown as colonies differed from those obtained when they were grown as broth suspensions.
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