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Effect of NaF and pH on the Growth and Glycolytic Rate of Recently Isolated Strains of Oral Lactobacillus Species

Department of Preventive Dental Science and

G.H. Bowden

Department of Oral Biology, Faculty of Dentistry, University of Manitoba, Winnipeg, Manitoba, Canada R3E OW3

I.R. Hamilton

Department of Oral Biology, Faculty of Dentistry, University of Manitoba, Winnipeg, Manitoba, Canada R3E OW3

Twenty-eight fresh and seven type strains of Lactobacillus species were tested for their ability to grow and metabolize glucose in the presence of fluoride. While there was variation between the test organisms, freshly isolated strains were generally more fluoride-tolerant than were the type strains, and a group of seven strains would grow well at pH 4.5 with 5.3 mm NaF. Glucose metabolism by representative strains of this latter group required average fluoride concentrations of 204, 64, and 9.3 mM to inhibit glycolysis completely at pH 7.0, 6.0, and 5.0, respectively. These values are ten times higher than those required to inhibit glucose metabolism by Streptococcus mutans.

Journal of Dental Research, Vol. 64, No. 3, 401-404 (1985)
DOI: 10.1177/00220345850640030101


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