Merck - Quality Control - Reflextoquant

RQflex® 20 Reflectoquant®

for RQflex 20 Reflectoquant®

HMF is an organic compound that arises from the dehydration of fructose, e.g. when honey is heated for easier filling. HMF is barely detectable in freshly centrifuged honey, but increases at 2-3 mg/kg annually, depending on storage temperature and pH. At 21°C, HMF content can rise to 20 mg/kg in just one year. The Reflectoquant® HMF Test is the first rapid test for the determination of HMF content, delivering accurate quantitative results in just a few minutes after sample preparation. Easy-to-use, portable and economical, the test is ideal for monitoring raw materials, as well as manufacturing and filling processes. This test provides a simple on-site alternative to time consuming HPLC analysis. On the test strip, HMF reacts with a barbituric acid derivative and an aminophenazone derivative to form a red-violet compound that is determined reflectometrically on the RQflex®.

Peroxide is an all purpose disinfectant which, due to its excellent antiviral, bactericidal and fungicidal action, is widely used in the food industry. Here, the Reflectoquant® test strips are suited for the determination of inorganic peroxides in aqueous solutions. Furthermore the test can be used in disinfecting and rinsing solutions (e.g. in food technology, laundries) and in swimming-pool water. Peroxidase transfers peroxide oxygen to an organic redox indicator. This produces a blue oxidation product that is determined reflectometrically on the RQflex®. For pre-testing a sample in an economic and quick way to estimate the peroxide concentration and a possible dilution factor prior to using this quantitative method we recommend our semi-quantitative MQuant® test strips for peroxide.

The Recalibration Set can be used for the RQflex® 10 and the RQflex® 10 plus reflectometer. The set contains a calibration strip, an internal standard and a barcode strip for calibration.