Artefactual results were obtained during assay of sugars in ethanolic extracts of potato tubers with the microplate method. The problem was attributed to contamination with alcohol dehydrogenase of the commercial (yeast) phosphoglucose isomerase used in the assay. The use of phosphoglucose isomerase from another source (rabbit muscle) eliminated the problem.
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Viola R.(1992)A microplate reader assay for rapid enzymatic quantification of sugars in potato tubers Potato Research 35 55-58