A method for assessing plasma free fatty acids from C2 to C18 and its application for the early detection of colorectal cancer.

Abstract

The targeted analysis of free fatty acids (FFAs) is attracting interest since several years with a plenty of studies. However, most of them are devoted to the solely determination of the short-chain fatty acids (SCFAs) arising from the symbiotic gut microbiota metabolism. Recently, the FFAs analysis highlighted changes in the plasma levels of octanoic and decanoic acids (medium-chain fatty acids or MCFAs) may be associated to gastrointestinal diseases, including colorectal cancer (CRC). Then, the simultaneous quantification of both SCFAs and MCFAs could be useful to put in evidence the interconnection between microbiota and metabolic alterations during hosts' disease. To this aim, it was developed an isotopic dilution gas-chromatography coupled mass spectrometry (ID/GC-MS) method for the targeted analysis of both linear and branched FFAs (SCFAs, MCFAs, and LCFAs) in human plasma samples as specific markers for both microbiota and host metabolic alterations. In order to minimize sample manipulation procedures, an efficient, sensible and low time-consuming procedure is presented, which relies in a simple liquid-liquid extraction before the determination of underivatized free acids (FFAs) by Single Ion Monitoring (SIM) acquisition. The reached detection limits (LODs) were less than 100 μg L-1 for most of analytes, except for acetic, hexadecanoic and octadecanoic acids that showed a LOD > 1 mg L-1. Methods accuracy and precision, obtained by the analysis of the FFAs mixtures showed accuracy values between 84% and 100% and precision (RSD %) between 0.1% and 12.4% at the concentration levels tested. The proposed ID/GC-MS method was applied in a case study to evaluate the FFAs as specific markers for both microbiota and host alterations in CRC patients. Obtained results highlight the advantage of present method for its rapidity, simplicity, and robustness.

• Authors: Gianluca Bartolucci, Marco Pallecchi, Marta Menicatti, Laura Moracci, Salvatore Pucciarelli, Marco Agostini, Sara Crotti
• Journal: Journal of pharmaceutical and biomedical analysis (J Pharm Biomed Anal) Vol. 215 Pg. 114762 (Jun 05 2022) ISSN: 1873-264X [Electronic] England
• PMID: 35489246 (Publication Type: Journal Article)
• Copyright: Copyright © 2022 Elsevier B.V. All rights reserved.

Chemical References

• Fatty Acids
• Fatty Acids, Nonesterified
• Fatty Acids, Volatile

Topics

• Colorectal Neoplasms (diagnosis)
• Early Detection of Cancer
• Fatty Acids
• Fatty Acids, Nonesterified
• Fatty Acids, Volatile (analysis)
• Gas Chromatography-Mass Spectrometry (methods)
• Humans