title: Isolation of cholesterol oxidation products from animal fat using aminopropyl solid-phase extraction.
abstract: Cholesterol oxidation products were separated from triglycerides and cholesterol in a single step on an aminopropyl solid-phase extraction column. The products were purified by subsequent transesterification and saponification, derivatized to trimethylsilyl ethers and analyzed by gas chromatography. Heated cholesterol-containing fat samples were autoxidized by bubbling air through them. When the flow-rate of air was set at 100 ml/min, the concentration of cholesterol oxidation products in the fat increased to a maximum after 1-2 h and then decreased to almost a zero level after 8 h. The concentration of cholesterol oxidation products in the fat increased over a similar time period, without reaching a maximum, when the flow-rate of air was decreased to 5 ml/min.
authors.affiliation: Horticulture and Food Research Institute of New Zealand Ltd., Palmerston North.
authors.forename: C B
authors.initials: CB
authors.lastname: Johnson
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry*; D000818:Animals; D002784:Cholesterol / Q000737:chemistry*; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D004951:Esterification; D013058:Mass Spectrometry; D010084:Oxidation-Reduction; D015203:Reproducibility of Results; D012503:Saponins / Q000737:chemistry
chemical_list: D012503:Saponins; D002784:Cholesterol