“…While plasmáis separate best when converted to 2,4-dinitrophenylhydrazones prior to chromatography (572), serum lipides may be chromatographed on paper directly without solvent extraction (723). Kaufmann has saponified gylcerides and phosphatides (564,571), reduced carbonyl groups (561), and hydrogenated unsaturated fatty acids (570,571) directly on the filter paper. New detection methods have been published for diglycerides (217) and various phospholipides (47,156,492,1148), including cerebrosides (139), and for sphingosine (1003).…”