KJELDATHERM Block Digestion Systems.

A universal method for Milk Protein by Kjeldahl

With a target to optimise the range of variation in Kjeldahl protein analysis of milk according to official methods like AOAC 991.20 or ISO 8968-1:2001, digestion conditions were varied to obtain lowest variation in protein content between duplicates with the highest possible recovery.

It has been found that digesting for 2 hours at 390°C with a KJELDATHERM digestion block achieves this. Variation in the results across a series of 20 samples was significantly lower than 0.038% protein.The only difference found compared to the official methods was the status of the sample after digestion. Although the official methods require a clear solution it was found not to be necessary in achieving the best results.

All recoveries were checked with Tryptophan achieving a recovery of >99%.


If you would like further information on protein analysis in milk or milk products email at customerservice(at)lennox.ie



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