Schmidt+Haensch’s Polartronic M 202 and Saccharomat 202 measure dextran content. Using a polarimeter with NIR (Near Infrared Wavelength) and a specific dextranase, the dextran is selectively broken down into sugars of lesser specific rotation without affecting other substances present in the juice. The initial dextran concentration is derived from a calibration curve of the change in the measured optical rotation (OR) due to enzymatic hydrolysis, which is calculated and displayed automatically by the Polarimeter. The procedure takes approximately 10 minutes and can be semi-automated if required. The use of an NIR Polarimeter makes the use of sample clarification unnecessary; the sample just has to be filtrated using filter paper and filter aid.
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