CDR FoodLab® is the chemical analyzer for quality and process control that allows you to determine a wide range of parameters of many foods, animal feeds and pet foods.

Peroxidase test in milk

CDR’s innovative method enables to easily and quickly quantify lactoperoxidase in milk. The test can be carried out on microscopic samples as is and requires the use of a pre-filled reagent in disposable cuvettes.

The persistence of lacto-peroxidase activity in pasteurized milk provides a good indication of the quality of a product, because only a raw milk of good microbiological quality can be put through a mild pasteurization process in order to not inactivate this enzyme. Traditional methods are often qualitative (present/not present) and thus able only to indicate whether the thermal process has been performed. Quantifying lactoperoxidase in pasteurized milk enables instead to determine the nutritional quality of milk. Higher value of peroxidase means that the milk has preserved its original characteristics.


Principle of the test

Reaction involved in the analysis of peroxidase in milk

In presence of an indicator and hydrogen peroxide, milk peroxidase catalyzes forming a red compound with an intensity that is directly proportional to the concentration of peroxidase in the sample when measured at 505 nm.

Calibration curve

The quantitative determination of peroxidase is an innovative test and it is therefore not easy to find samples that can be used as reference or official reference methods. Thus, CDR’s laboratories carried out several test, using CDR FoodLab®’s method, on samples of different manufacturers and compared the resulting values with those specified in the technical data sheet of the Reflectoquant® reflectometric method. The results compared well.

Peroxidase analysis on milk with CDR FoodLab®: correlation curve with the reference method. R² = 0.9962

Reagent test Kits

Measuring range

AnalysesMeasuring rangeResolutionRepeatability

Analyzers for quality control of milk and dairy products


CDR FoodLab®

  • Complete analysis panel, supplied already configured
  • Up to 16 determinations simultaneously
  • Possibility of carrying out analyses of the same sample 
  • Integrated printer
  • Full connections (LAN - USB - Bluetooth barcode/QR code reader)

CDR FoodLab® Jr

  • Partial analysis panel, supplied configured with 3 analyses of your choice, implementable
  • Up to 3 determinations simultaneously
  • Wireless connection to external printer
  • USB connections