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.

Chemical test for lactose in milk and dairy products

Lactose is a reducing sugar, which is present in milk in concentrations ranging from 4.5 to 5 g/100 gr. The lactose molecule is a disaccharide composed of one glucose and one galactose sub-units, and is indispensable for many fermentation processes that take place within milk.
The reduced secretion of the lactase enzyme in human beings is associated with an intolerance to lactose, and, accordingly, to milk and its derivative products.

The test is suitable for use on lactose free products, where a part or all the lactose has been broken down to glucose and galactose by the lactase enzyme, it is also suitable for products where lactose is normally present.


Test principle

Lactose is split in glucose and galactose.
Glucose reacts with a phenolic compound through an enzymatic reaction, with peroxidase, and forms a pink coloured complex. The absorbance of the complex is read at 505 nm, and the value is directly proportional to the concentration of lactose in the sample.

Correlation curve

The accuracy of the CDR FoodLab® method was evaluated by determining the correlation between the results of different milk samples, obtained by analysis with CDR FoodLab® and those obtained by the Istituto Zooprofilattico by means of the HPLC method (High Performance Liquid Chromatography) as foreseen by the method of reference MP 02/050 rev.6- 2018. [Take a look at the complete study]


The Poligny ACTALIA (France) reference laboratory, specialising in food analysis, performed an evaluation study: the analysis of lactose on lactose-free milk was performed with CDR FoodLab® and with the HPLC method (ISO 22662) . The correlation R2 = 0.9882 is excellent considering the type of analysis and the difficulty in performing the reference methods.


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