SummaryA known quantity of tissue \/ plasma is hydrolyzed and extracted after adding known amounts of internal standards: eg. heptadecanoic acid and cholesterol-d7. Fatty acids \/ cholesterol are analyzed as their trimethylsilyl derivatives using gas chromatography-electron impact ionization mass spectrometry (GCMS) (note: this protocol outlines the processing for palmitate and cholesterol; other fatty acids and sterols can be assayed using this preparation, see refs 1,2).References:\n1. Triglyceride synthesis in epididymal adipose tissue: contribution of glucose and non-glucose carbon sources. Bederman IR, Foy S, Chandramouli V, Alexander JC, Previs SF. J Biol Chem. 2009, 284(10):6101-8.\n2. Influence of diet on the modeling of adipose tissue triglycerides during growth. Brunengraber DZ, McCabe BJ, Kasumov T, Alexander JC, Chandramouli V, Previs SF. Am J Physiol Endocrinol Metab. 2003, 285(4):E917-25.