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Various methods are used to analyse cholesterol oxidation products (COP) due to the unavailability of a standard method. In order to select a suitable method for the enrichment of COP, three methods of saponification (A-C), and transesterification (D) of tallow with three levels (5, 10 and 20 μg) of spiked COP, were evaluated. Further enrichment of COP was done by solid phase extraction, quantified...