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Title: Determination of bacterial activity by use of an evanescent-wave fiber-optic sensor. Author: John MS, Kishen A, Sing LC, Asundi A. Journal: Appl Opt; 2002 Dec 01; 41(34):7334-8. PubMed ID: 12477126. Abstract: A novel technique based on fiber-optic evanescent-wave spectroscopy is proposed for the detection of bacterial activity in human saliva. The sensor determines th e specific concentration of Streptococcus mutans in saliva, which is a major causative factor in dental caries. In this design, one prepares the fiber-optic bacterial sensor by replacing a portion of the cladding region of a multimode fiber with a dye-encapsulated xerogel, using the solgel technique. The exponential decay of the evanescent wave at the core-cladding interface of a multimode fiber is utilized for the determination of bacterial activity in saliva. The acidogenic profile of Streptococcus mutans is estimated by use of evanescent-waveabsorption spectra at various levels of bacterial activity.[Abstract] [Full Text] [Related] [New Search]