title: Solid-phase extraction on silica cartridges as an aid to platelet-activating factor enrichment and analysis.
abstract: Solid-phase extraction methods using pre-packed silica cartridges and various elution solvents have been developed and evaluated as chromatographic means to enrich biological lipid extracts for platelet-activating factor (PAF). The optimized procedure advanced selectively removed the major tissue/blood neutral lipids and non-choline-containing phospholipids from complex lipid mixtures and yielded thereby a choline phospholipid fraction markedly enriched in bioactive PAF. Some tested solid-phase extraction procedures, while capable of resolving choline phospholipids from other polar and non-polar species, were detrimental to PAF's bioactivity and evidenced considerable loss or degradation of this analyte. It is concluded that, with solvents of appropriate composition, strength and polarity, solid-phase extraction on silica cartridges has several unique advantages over conventional thin-layer and column chromatographic methods presently in use for PAF enrichment from biological sources.
authors.affiliation: Roche Research Center, Department of Pharmacology and Chemotherapy, Hoffmann-La Roche Inc., Nutley, NJ 07110.
authors.forename: D R
authors.initials: DR
authors.lastname: Janero
authors.forename: C
authors.initials: C
authors.lastname: Burghardt
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005069:Evaluation Studies as Topic; D009206:Myocardium / Q000032:analysis; D010972:Platelet Activating Factor / Q000032:analysis*; D051381:Rats; D012822:Silicon Dioxide
chemical_list: D010972:Platelet Activating Factor; D012822:Silicon Dioxide