Ammonia test in milk

The chemical analysis of the milk and dairy products for quality control for every stage of the production chain with CDR FoodLab

“Ammonia, as metabolite of microbial activity, was confirmed to be a suitable rapid monitoring index of the total hygienic quality of large mass raw milk. A 0.82 correlation was found between the total bacterial count and NH3, which we feel to be particularly influenced by the psycrophilic microflora. The standard and action-level values useful for rapid selection of milk are suggested. The value of the NH3 content of raw milk does not change after the pasteurization treatment, and can be used as a quality index of the pasteurized milk of unknow hygienic history. The behaviour of NH3 of pasteurized milk was investigated under cold storage conditions.” Ammonia in milk, a quality index.  [1991] Pinelli C.

Analyzers for determining Ammonia in milk and dairy products


  CDR FoodLab for performing a range of tests in milk and a variety of dairy products CDR FOODLAB® CDR FoodLab Junior  for performing a range of tests in milk and a variety of dairy products CDR FOODLAB® JUNIOR
Analyses Milk and Dairy Products:
L-Lactic acid
Milk Urea Nitrogen (MUN)
Alkaline phosphatase (ALP)
Hydrogen peroxide
ε-fructosyl-lisine (Furosine)
Configuration with tailored panel of analyses
Simultaneous Sample Analyses 16 3
Multiple Analyses on a Sample si

It is not necessary skilled staff nor a laboratory for the analysis.
Results are correlated with reference method results.
It is free of service and maintenance cost.
With the same analyzers you can also perform analysis of egg, tomato, vegetable purees, cheeses and fats.


Test type: End Point
Testing time: 8 minutes
It is possible to carry out several test sessions with a maximum of 16 samples.

Test priciple

Ione ammonio + der. Fenolico freccia blue/green complex

The ammonium ions react with a phenolic derivative and form a blue-green colored complex whose intensity, measured at 700 nm, is directly proportional to the concentration of ammonia in the sample

Calibration curve

The Poligny ACTALIA (France) reference laboratory, specialising in food analysis, performed an evaluation study: the determination of ammonia on whey was performed with CDR FoodLab® and with the enzymatic reference method (NF V 04-217). The correlation between the CDR FoodLab® method and the reference method was found to be good,  considering the type of analysis and the difficulty in performing the reference methodology, obtaining an R2 = 0.9265.

The determination of ammonia on whey was performed with CDR FoodLab® and with the enzymatic reference method (NF V 04-217). The correlation R2 = 0.9265

Comparative tests, on samples of whole milk, performed between the reference method and the FOODLAB method, made in a leading company of production of milk, have confirmed a very good correlation between the two systems.

Reagent test Kits

The reagents are packaged in foil pouches containing 10 tubes useful to perform 10 analyses.

This is the minimum package that allows the use of CDR systems even to those who need to make a few analyses, thus not wasting reagents.

There are also boxes of 100 tests, however, packaged in 10 bags of 10 tubes containing the reagent.

Code *300050: 100 tests

Code *300054: 10 tests

The reagents have a shelf-life of 12 months

Processing Sample 

Use Milk as is
Milk derivatives suitably treated

Measuring range

Test Measuring Range Resolution Repeatability
NH3 milk 1 - 80 ppm 0.01 ppm 0.83 ppm
NH3 cheese 1 - 80 ppm 0.01 ppm 0.97 ppm

Per campioni con valori di ammoniaca > 80 ppm, utilizzare metà volume di campione (25 uL) e moltiplicare il risultato ottenuto per 2.

Reagents developed by CDR S.r.l - Quality System Certified ISO 9001 Ed. 2015 - Certificate n. 9115

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With the CDR system, you can perform your tests in total autonomy

Neither skilled staff nor a dedicated external laboratory is needed to use our systems. CDR FoodLab® optimizes traditional testing methods, making them faster and easier, while guaranteeing accuracy standards in line with the reference methods.

Analytical kit

CDR FoodLab® Analysis Systems use disposable pre-vialed reagents specifically developed by the research laboratories of CDR. The use of pre-vialed reagents and the analytical procedures allow:

  • a sample preparation that is quick and easy, when needed at all;
  • making analytical procedures extremely fast and easy;
  • removing all needs for complex calibration procedures.

Reagents come in aluminum packages containing 10 test tubes each to perform 10 tests (or packages for 100 tests containing 10 single packages of 10 test tubes each).

Just a few steps and results are yielded right away

Just a few steps will suffice to carry out your analysis in a rapid way in total autonomy. The system is composed of both the analyzer based on photometric technology and a kit of low toxicity, pre-vialed reagents, developed by CDR.

CDR FoodLab® is cost-effective because it does not require the use of expensive equipment and does not entail maintenance, assistance or calibration costs.
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