Effect of pH on acid production from sorbitol in washed cell suspensions of oral bacteria

Caries Research
S KalfasS Edwardsson

Abstract

The acid production from sorbitol and glucose was studied under anaerobic conditions in resting cell suspensions of bacteria from the predominant sorbitol-fermenting human dental plaque flora, belonging to the genera Streptococcus, Lactobacillus and Actinomyces. The acid production activity of the bacterial cells was followed by titration with alkali, at environmental pH 7.0, 6.0 and 5.0 after addition of carbohydrate solution. The metabolic end products formed in the suspensions were analyzed thereafter by isotachophoretic and enzymatic methods. The results showed that sorbitol was fermented at a slower rate than glucose. Lowering the environmental pH decreased the acid production activity from the two carbohydrates. Compared with glucose, the catabolism of sorbitol was affected to greater extent by the pH conditions. The total amount of acids formed from sorbitol was considerably less than from glucose. Lactic acid, which was the major end product in glucose-challenged suspensions, was produced only in low concentrations from sorbitol by all strains tested. The ratio strong (formic + lactic)/weak acids was moreover lower for sorbitol than for glucose. The present results further illustrate some of the mechanisms behind the lo...Continue Reading

Citations

Dec 1, 1994·Oral Microbiology and Immunology·S KalfasT Yamada
Dec 1, 1995·Oral Microbiology and Immunology·N TakahashiT Yamada
Aug 1, 1990·Acta Odontologica Scandinavica·S Kalfas, S Edwardsson
Oct 1, 1991·Journal of Dentistry·S D Hogg, A J Rugg-Gunn
Jan 14, 2000·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·N Takahashi, T Yamada

❮ Previous
Next ❯

Related Concepts

Related Feeds

Actinomycosis

Actinomycosis is a rare, chronic, and slowly progressive granulomatous disease caused by filamentous Gram positive anaerobic bacteria from the Actinomycetaceae family (genus Actinomyces). The disease is characterised by the formation of painful abscesses in the mouth, lungs,breast or gastrointestinal tract. Discover the latest research on actinomycosis here.