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[An analysis of chemical oxygen demand, carbohydrate, IgG and IgA in extracellular fluid of bacterial plaque].

The chemical oxygen demand (COD) of extracellular plaque fluid was measured by potassium dichromate method. Micro-anthrone method and high performance liquid chromatography were used for measuring the carbohydrate content in the fluid. Immunochemistry system was used for measuring IgG and IgA contents in it. The results showed: (1) a high value of COD was found in the extracellular fluid, and it further increased with sugar-intake; (2) during resting stage, the content of carbohydrate measured by microanthrone method or high performance chromatography was very low, and there was no free glucose, fructose or sucrose; (3) no difference of IgG and IgA contents in plaque fluid between caries active (CA) and caries free (CF) subjects was found.