Journal Highlight: Determination of emerging nitrogenous economic adulterants in milk proteins by high-performance liquid chromatography/compact mass spectrometry

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  • Published: Jul 25, 2016
  • Author: separationsNOW
  • Channels: HPLC
thumbnail image: Journal Highlight: Determination of emerging nitrogenous economic adulterants in milk proteins by high-performance liquid chromatography/compact mass spectrometry
An LC/MS method has been developed for the rapid frontline analysis of six nitrogenous protein adulterants (melamine, ammeline, ammelide, amidinourea, cyromazine and cyanuric acid) in the whole milk powder, nonfat milk powder and whey protein concentrate.

Determination of emerging nitrogenous economic adulterants in milk proteins by high-performance liquid chromatography/compact mass spectrometry

Rapid Communications in Mass Spectrometry, 2016, 30, 1265-1272
Jonathan Draher, Stefan Ehling, Nick Cellar, Todime Reddy, Jack Henion and Nigel Sousou

Abstract: A liquid chromatography/mass spectrometry (LC/MS)-based method using a single quadrupole mass spectrometer has been developed for the rapid frontline analysis of six nitrogenous protein adulterants, i.e. melamine, ammeline, ammelide, amidinourea, cyromazine and cyanuric acid, in three key milk-derived ingredients, i.e. whole milk powder, nonfat milk powder and whey protein concentrate. The sample preparation scheme involves both "dilute and shoot" as well as solid-phase extraction (SPE)-based methods. The "dilute and shoot" scheme uses a tenfold dilution of sample with water followed by protein precipitation using 2% formic acid in acetonitrile. The SPE scheme involves tenfold dilution of sample with water, followed by protein precipitation using acetonitrile, and further cleanup through Strata Melamine SPE cartridges. Sample extracts were analyzed by hydrophilic interaction chromatography/single quadrupole mass spectrometry (HILIC/MS) in both positive and negative electrospray ionization mode. Accurate quantitation was achieved using stable isotope labeled internal standards. A multi-day method validation study was conducted using three different milk-derived ingredients. Average accuracies, relative standard deviations (RSD) and method detection limits (MDL) for all analytes in whole milk powder were 65–118%, 7–11% and 0.9–30 mg/kg, using the "dilute and shoot" extraction procedure. The SPE procedure results were 102-111%, 5–13%, and 0.4–2.5 mg/kg, respectively, for melamine, ammeline, ammelide and cyromazine only. A rugged and simple to use analytical method to screen for the presence of nitrogenous economic adulterants in milk-derived ingredients has been developed for routine frontline use.

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