STUDIES ON THE EXTRACELLULAR POLYSACCHARIDES PRODUCED BY ISOLATED DENTAL PLAQUE STREPTOCOCCI

Dental Plaque Streptococci가 생산하는 세포외 다당류에 관한 연구

The present investigation describes the chemical nature of purified extracellular polysaccharides synthesized by tow resembling streptococci, Streptococcus salivarius strain SD-1 and Streptococcus mitis strain SD-9, which was isolated from human dental plaque, with the following results. 1. Extracellular polysaccharide by Streptoccus salivarius strain SD-1 is recovered mostly in Fraction I-and II-45% of the presne purification procedure, leaving trace amount in Fraction I-and II-70%. 2. The dextran is the major polysaccharides in Fraction I-and II-45% of both strains with minor amounts of levan. 3. The Fraction I-and II-45% of both strains contain glucose and fructose, which its 70% of the same fractions glucose only. 4. It appears that the glycerol was the major end product of the Smith degradation of the Fraction I-45% of both strains.