Abstract
A method is described for the direct quantitative analysis of the lipid classes of mammalian tissue lipids using high performance liquid chromatography (HPLC) with a flame ionization detector (FID). The lipid is extracted from the tissue with chloroform/methanol after deactivation of hydrolytic enzymes and removal of nonlipid substances by extraction with hot dilute acetic acid (0.05N). Separation of the lipid classes is performed with a column (45 cm × 0.2 cm id) of 8 μm silica (Spherisorb, Phase Sep, Hauppague, NY) treated with concentrated ammonium hydroxide at a solvent flow rate of 0.5 ml/min, which requires a pressure of ca. 900 psi. Cholesteryl esters (CE) and triglycerides (TG) are eluted first with Skellysolve B/methylene chloride (1∶1, v/v); cholesterol (CH) is eluted with chloroform/methylene chloride (1∶2, v/v) and the phospholipids with methanol containing 6% ammonium hydroxide added to the latter solvent in a linear gradient. The neutral lipids are eluted in ca. 12 min and the phospholipids in an additional 30 min. The relative amount of each lipid class was determined from standard curves of the peak areas obtained according to response factors using erucyl alcohol as an internal standard. The method was applied to samples of kidney, liver and serum of rats. Duplicate analyses were generally within ca. 1.0% and good agreement was obtained in the analysis of the lipid classes of Azolectin and liver mitochondria lipid compared to thin layer chromatography (TLC) via photodensitometry of charred spots or phosphorus analysis of recovered phospholipids.
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Phillips, F.C., Erdahl, W.L. & Privett, O.S. Quantitative analysis of lipid classes by liquid chromatography via a flame ionization detector. Lipids 17, 992–997 (1982). https://doi.org/10.1007/BF02534597
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DOI: https://doi.org/10.1007/BF02534597