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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Greaves, Ronda / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter


IMPACT FACTOR 2018: 3.638

CiteScore 2018: 2.44

SCImago Journal Rank (SJR) 2018: 1.191
Source Normalized Impact per Paper (SNIP) 2018: 1.205

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1437-4331
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Volume 51, Issue 4

Issues

Determination of the fatty acid profile of neutral lipids, free fatty acids and phospholipids in human plasma

Nina Firl
  • Bioanalytik Weihenstephan, Research Center for Nutrition and Food Sciences, Technische Universität München, Freising, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Hermine Kienberger
  • Bioanalytik Weihenstephan, Research Center for Nutrition and Food Sciences, Technische Universität München, Freising, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Teresa Hauser / Michael Rychlik
  • Corresponding author
  • Bioanalytik Weihenstephan, Research Center for Nutrition and Food Sciences, Technische Universität München, Freising, Germany
  • Chair of Analytical Food Chemistry, Technische Universität München, Freising, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2012-09-25 | DOI: https://doi.org/10.1515/cclm-2012-0203

Abstract

Background: Knowledge of the fatty acid composition of lipid classes in human plasma is an important factor in the investigation of human metabolism. Therefore, a method for the analysis of neutral lipid (NL), phospholipid (PL) and free fatty acids (FFA) in human plasma has been developed and validated.

Methods: Separation of lipid classes was carried out by solid phase extraction of the lipid extract. The fractions were transesterified and the resulting fatty acid methyl esters were determined by GC/FID. For the method to be validated, precision, detection and quantification limits, as well as recovery, were determined for combined lipid extraction, solid phase extraction and GC analysis.

Results: The lipid extraction was miniaturized and simplified by application of an ultrasound ‘Sonotrode’. The resolution of lipid classes was optimized with appropriate standards added to a representative plasma sample. In addition, a rapid derivatization procedure using trimethylsulfoniumhydroxide was established. Low determination limits (1.5, 0.2 and 1.3 μg/g plasma for NL, PL and FFA, respectively) indicate that the method’s sensitivity is sufficient to quantify even minor components. Furthermore, recovery for NL and PL fatty acids was found to range from 80% to 110%. The results were similar for FFA apart from more polar free fatty acids due to their higher solubility in water. Repetitive measurements showed very good precision apart from the long chain PUFA for which the coefficients of variation were significantly higher.

Conclusions: The present method is applicable to the quantitation of fatty acids in lipid classes of human plasma including several minor components.

Keywords: fatty acids; gas chromatography; lipid separation; miniaturized ultrasonication; plasma lipids, solid phase extraction; TMSH; validation

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About the article

Corresponding author: Michael Rychlik, Chair of Analytical Food Chemistry, Technische Universität München, Alte Akademie 10, 85354 Freising, Germany, Phone: +49 8161 713153, Fax: +49 8161 714216


Received: 2012-03-29

Accepted: 2012-08-19

Published Online: 2012-09-25

Published in Print: 2013-04-01


Citation Information: Clinical Chemistry and Laboratory Medicine, Volume 51, Issue 4, Pages 799–810, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/cclm-2012-0203.

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