NDLI: Detection of sheep and goat milk adulterations by direct MALDI-TOF MS analysis of milk tryptic digests.

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Detection of sheep and goat milk adulterations by direct MALDI-TOF MS analysis of milk tryptic digests.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Calvano, Cosima Damiana De Ceglie, Cristina Monopoli, Antonio Zambonin, Carlo Giorgio
Description	Country affiliation: Italy Author Affiliation: Calvano CD ( Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy. calvano@chimica.uniba.it)
Abstract	In dairy field, one of the most common frauds is the adulteration of higher value types of milk (sheep's and goat's) with milk of lower value (cow's milk). This illegal practice has an economic advantage for milk producers and poses a threat for consumers' health because of the presence of hidden allergens as, for example, cow milk proteins, in particular, (s1)-casein and ß-lactoglobulin. The urgent need of sensitive techniques to detect this kind of fraud brought to the development of chromatographic, immunoenzymatic, electrophoretic and mass spectrometric assays. In the current work, we present a fast, reproducible and sensitive method based on the direct matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) MS analysis of milk tryptic digests for the detection of milk adulteration by evaluating specie-specific markers in the peptide profiles. Several pure raw and commercial milk samples and binary mixtures containing cows' and goats', cows' and sheep's and goats' and sheep's milk (concentrations of each milk varied from 0% to 100%) were prepared, and tryptic digests were analyzed by MALDI-TOF MS. The use of the new MALDI matrix -cyano-4-chlorocinnamic acid allowed to detect cow and goat milk peptide markers up to 5% level of adulteration. Finally, from preliminary data, it seems that the strategy could be successfully applied also to detect similar adulterations in cheese samples.
File Format	HTM / HTML
ISSN	10765174
Issue Number	9
Volume Number	47
e-ISSN	10969888
Journal	Journal of Mass Spectrometry
Language	English
Publisher	Wiley
Publisher Date	2012-09-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Spectroscopy Discipline Chemistry Techniques Food Contamination Analysis Milk Proteins Milk Chemistry Peptide Fragments Spectrometry, Mass, Matrix-assisted Laser Desorption-ionization Methods Amino Acid Sequence Animals Cattle Cheese Food Analysis Goats Metabolism Molecular Sequence Data Sequence Alignment Sheep Instrumentation Trypsin Journal Article
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Medicine

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