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Journal of Clinical Microbiology, August 2001, p. 3009-3012, Vol. 39, No. 8
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.8.3009-3012.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Cariogenic Actinomyces Identified with a beta -Glucosidase-Dependent Green Color Reaction to Gardenia jasminoides Extract

Li Chen, Lili Ma,dagger No-Hee Park, and Wenyuan Shi*

School of Dentistry and Dental Research Institute, University of California, Los Angeles, California 90095

Received 19 December 2000/Returned for modification 15 March 2001/Accepted 21 May 2001

The oral bacteria Actinomyces naeslundii and Actinomyces viscosus are known to contribute to the initiation and progression of human dental caries, especially root caries. We report that both A. naeslundii and A. viscosus react with a component in the Gardenia jasminoides extract to produce a distinct green product. This green color reaction was found to be dependent on the bacterial beta -glucosidase. The reaction is specific for cariogenic actinomyces, and it can detect as few as 104 cells of A. naeslundii and A. viscosus per ml.

* Corresponding author. Mailing address: UCLA School of Dentistry, P.O. Box 951668, 10833 Le Conte Ave., Los Angeles, CA 90095-1668. Phone: (310) 825-8356. Fax: (310) 794-7109. E-mail: wenyuan{at}ucla.edu.

dagger Present address: Department of Dermatology, Zhejiang Hospital of Chinese Medicine, Hangzhou, 310006, People's Republic of China.

Journal of Clinical Microbiology, August 2001, p. 3009-3012, Vol. 39, No. 8
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.8.3009-3012.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.