The amount of uronic acid residues in samples containing glycosaminoglycans or pectin is an important parameter in the quantitative and structural analysis of these complex carbohydrates. This paper describes a method to determine the content of uronic acids in biological samples, using conventional polystyrene microtiter plates and microtiter plate-reading equipment with standard interference filters (i.e., 540 or 492 nm). This assay is a modification of a commonly used procedure, viz. hydrolysis of uronic acid containing carbohydrate polymers in 80% sulfuric acid containing tetraborate ions at 80 degrees C followed by a coloring step with an m-hydroxydiphenyl reagent at room temperature. The use of microtiter plates has several practical advantages: (i) less risk of handling hot, concentrated sulfuric acid is present; (ii) an accurate estimate of background absorbance by multiple reading of the plates is possible; and (iii) many samples can be assayed in one series without errors due to fading of the final color. The validity of the assay was checked for the quantification of hyaluronic acid in equine synovial fluid samples. We consider this the method of choice when a large number of samples must be analyzed for their content of uronic acid residues.
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