title: HPLC separation and determination of 12 cholesterol oxidation products in fish: comparative study of RI, UV, and APCI-MS detectors.
abstract: A simple, fast, and sensitive method for the extraction through direct saponification, separation, quantification, and identification of 12 cholesterol oxidation products (COPs) and cholesterol in a single isocratic, normal-phase, high-performance liquid chromatography (HPLC) was developed. Three detectors were compared for determination of COPs and cholesterol in fish samples: refractive index (RI), ultraviolet (UV), and atmospheric pressure chemical ionization mass spectrometry (APCI-MS). The results did not show significant differences (p > 0.05) between the concentration of the cholesterol oxides and cholesterol obtained with these detectors. The present study demonstrated the presence of 19-hydroxycholesterol, 22"R"-hydroxycholesterol, 22"S"-hydroxycholesterol, 24"S"-hydroxycholesterol, and 25"R"-hydroxycholesterol for the first time in fish samples.
authors.affiliation: Department of Food Science, Faculty of Food Engineering, State University of Campinas, 13083-862 Campinas, Sao Paulo, Brazil.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Saldanha
authors.forename: Alexandra Christine Helena Frankland
authors.initials: AC
authors.lastname: Sawaya
authors.forename: Marcos Nogueira
authors.initials: MN
authors.lastname: Eberlin
authors.forename: Neura
authors.initials: N
authors.lastname: Bragagnolo
mesh_terms: D000818:Animals; D002784:Cholesterol / Q000032:analysis* / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D005399:Fishes; D005504:Food Analysis; D006888:Hydroxycholesterols / Q000032:analysis; D010084:Oxidation-Reduction
chemical_list: D006888:Hydroxycholesterols; D002784:Cholesterol