11075482882?profile=RESIZE_180x180Adulteration of goats milk with cows milk is a safety hazard (to allergenic consumers) as well as an economic risk.

The detection of caseins by mass spectrometry requires the selection of suitable characteristic peptides. A recent paper (here – open access) reported developing and optimising a MALDI-TOF MS method to detect the three most representative specific peptides of caseins in cow milk. It was found that 2,5-dihydroxybenzoic acid (DHB) was a more suitable MALDI matrix than α-cyano-4-hydroxycinnamic acid (CHCA), giving an LoD of 0.1 mg/L for α, β-casein.  A protocol was developed and proven to detect adulteration of goats milk with cows milk at 1% or more.  The method was applied to Chinese market samples of five brands of commercial goat milk.  Specific peptides of bovine casein were detected in four of them.

The authors conclude that the method is reliable, high throughput, rapid, has simple preprocessing, and can be a powerful tool for prewarning of dairy allergens.

Photo by Eiliv Aceron on Unsplash

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