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DETERMINATION OF NON-PROTEIN AMINO ACIDS AND BETAINES IN VEGETABLE OILS BY FLOW-INJECTION TRIPLE QUADRUPOLE TANDEM MASS SPECTROMETRY: A SCREENING METHOD FOR THE DETECTION OF ADULTERATIONS OF OLIVE OILS.
MedLine Citation:
PMID:  22229859     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A novel screening method using an automated flow-injection electrospray ionization tandem mass spectrometry system is proposed for the simultaneous determination of five non-protein amino acids (β-alanine, alloisoleucine, ornithine, citrulline, pyroglutamic acid) and three betaines (glycine betaine, trigonelline, proline betaine) after derivatization with butanolic HCl. MS/MS experiments were carried out in a triple quadrupole instrument using a multiple reaction monitoring mode in less than 2 min. The proposed method provided high fingerprinting power to identify the presence of five of the studied compounds in different types of vegetable oils (soybean, sunflower, corn and olive) with LODs at ppb levels. The method was validated and different mixtures of extra virgin olive oil with seed oils were analyzed achieving the typification for the detection of adulterations in extra virgin olive oils up to 2% w/w. The non-protein amino acid ornithine was confirmed as marker for adulterations in the olive oils analyzed.
Authors:
Laura Sanchez-Hernandez; Leonor Nozal; M Luisa Marina; Antonio Crego
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-9
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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