Document Detail

Single-shot biodiesel analysis: nearly instantaneous typification and quality control solely by ambient mass spectrometry.
MedLine Citation:
PMID:  18808154     Owner:  NLM     Status:  MEDLINE    
Using a simple and easily implemented desorption/ionization mass spectrometry technique, a tiny droplet of biodiesel placed on the surface of a sheet of paper is analyzed directly and nearly instantaneously under ambient conditions. No pre-separation or sample preparation is required, and clean mass spectra are obtained with great simplicity. In the positive ion mode, easy ambient sonic-spray ionization mass spectrometry, EASI(+)-MS, provides typical profiles of the major components of biodiesel samples, that is, either methyl esters (FAME) or ethyl esters (FAEE) of the natural fatty acids and triglycerides (TAG) from residual oil or oil from adulteration. Each FAME (FAEE) or TAG molecule is detected as a single sodiated molecule, [M + Na] (+) with relative intensities that correlate well with the known fatty acid profiles of the oil. Using EASI(-)-MS, typical and complementary profiles of free fatty acids (FFA) are obtained, which are detected in their deprotonated forms [FAA - H] (-). A general, single-shot approach for biodiesel analysis is therefore described, and samples from different feedstocks, from blends with petrodiesel, or from either methanol or ethanol trans-esterification are readily typified and major parameters of quality accessed.
Patricia V Abdelnur; Livia S Eberlin; Gilberto F de Sá; Vanderlea de Souza; Marcos N Eberlin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-09-23
Journal Detail:
Title:  Analytical chemistry     Volume:  80     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-10-14     Completed Date:  2008-12-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7882-6     Citation Subset:  IM    
ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, State University of Campinas, 13084-970 Campinas, SP, Brazil.
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MeSH Terms
Analytic Sample Preparation Methods
Bioelectric Energy Sources*
Esters / analysis
Fatty Acids / analysis
Mass Spectrometry / methods*
Oils / chemistry
Quality Control
Time Factors
Triglycerides / analysis
Reg. No./Substance:
0/Esters; 0/Fatty Acids; 0/Oils; 0/Triglycerides

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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