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

CDR FoodLab®  allows to perform lactose determination in milk in accordance to the reference method (HPLC), that requests training, special skills and so much time at disposal.

Instead with CDR FoodLab®    you can estimate the lactose in milk and dairy products with a simple analysis method, in 10 minutes. In few steps you can obtain reliable and accurate results.

The CDR FoodLab® method can work easily on liquid or solid samples. For the latter it is required a very quick sample pretreatment in order to extract the solution for the analysis.

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.

Method

Test principle

Lactose is a disaccharide sugar that is found in milk and is formed from galactose and glucose. Lactose makes up around 4.5~5% of milk (by weight). The enzyme lactase is essential for digestive hydrolysis of lactose in milk. Deficiency of the enzyme causes lactose intolerance.

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.

Correlation chart Analysis of lactose on CDR FoodLab® delactosed milk and HPLC method (ISO 22662). Correlation R² = 0.9882

Reagent test Kits

Measuring range

AnalysesMeasuring rangeResolutionRepeatability

Analyzers for quality control of milk and dairy products

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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)
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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
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