An LC-MRM method for measuring intestinal triglyceride assembly using an oral stable isotope-labeled fat challenge

• Published in: Bioanalysis Vol. 8; no. 12; pp. 1265 - 1277
• Main Authors: Li, Xiaofang, Parks, Elizabeth J, McLaren, David G, Lambert, Jennifer E, Cardasis, Helene L, Chappell, Derek L, McAvoy, Thomas, Salituro, Gino, Alon, Achilles, Dennie, Justin, Chakravarthy, Manu, Shankar, Sudha S, Laterza, Omar F, Lassman, Michael E
• Format: Journal Article
• Language: English
• Published: England 01.06.2016
• Subjects: Adolescent; Adult; Chromatography, High Pressure Liquid - methods; Deuterium - analysis; Diet; Humans; Intestines - metabolism; Isotope Labeling - methods; Male; Oleic Acid - analysis; Oleic Acid - blood; Oleic Acid - metabolism; Triglycerides - analysis; Triglycerides - blood; Triglycerides - metabolism; Young Adult; triglycerides; fractional appearance rate; MS; isotope-label; precursor pool
• ISSN: 1757-6180; 1757-6199
• DOI: 10.4155/bio-2016-0024

A traditional oral fatty acid challenge assesses absorption of triacylglycerol (TG) into the periphery through the intestines, but cannot distinguish the composition or source of fatty acid in the TG. Stable isotope-labeled tracers combined with LC-MRM can be used to identify and distinguish TG synthesized with dietary and stored fatty acids. Concentrations of three abundant TGs (52:2, 54:3 and 54:4) were monitored for incorporation of one or two (2)H11-oleate molecules per TG. This method was subjected to routine assay validation and meets typical requirements for an assay to be used to support clinical studies. Calculations for the fractional appearance rate of TG in plasma are presented along with the intracellular enterocyte precursor pool for 12 study participants.