FACTORS INFLUENCING THE FORMATION OF INSOLUBLE GLUCAN BY STREPTOCOCCUS SOBRINUS

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Journal of the Korean Academy of Pediatric Dentistry 2000;27(1):90-97.
Published online February 29, 2000.

FACTORS INFLUENCING THE FORMATION OF INSOLUBLE GLUCAN BY STREPTOCOCCUS SOBRINUS

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Streptococcus sobrinus의 비수용성 글루캔 합성에 영향을 미치는 인자

정진¹, 김신²

¹부산대학교 치과대학 구강미생물학교실
²부산대학교 치과대학 소아치과학교실

Abstract

There are various kinds of factors associated with the formation of dental plaque in oral cavity such as nutrient molecules and chemical agents. The factors influencing the formation of insoluble glucan by Streptococcus sobrinus and its replication were examined on orthodontic wires. The results were as follows: 1. Insoluble glucan was well produced in the media initially adjusted at pH 7.0 than pH 5.5 or pH 8.5 like bacterial replication. 2. The synthesis of insoluble glucan and bacterial replication were significantly increased in the media containing 2.5% yeast extract. The formation of insoluble glucan was inhibited by 10 folds in the media containing 20% of sucrose than 1.25%, but the replication of bacteria was increased by 20 folds. 3. Insoluble glucan was significantly formed at a concentration of 1.0mM of calcium chloride, 40mM of potassium chloride, 0.1mM of magnesium chloride, while the replication of bacteria was little influenced by them regardless their concentration. 4. The formation of insoluble glucan and bacterial replication were significant in the media containing 10mM of sodium bicarbonate, but both were completely inhibited at 100mM or above. The production of insoluble glucan and the bacterial replication were largely decreased at 10mM of Tris while insoluble glucan was formed in abundance at 100mM of Tris. 5. The synthesis of insoluble glucan and the bacterial replication were inhibited at 10mM or above of sodium phosphate and potassium phosphate.

Key Words: Streptococcus sobrinus, Insoluble glucan, Bacterial replication, Factors