Triacylglyceride hydroperoxides (HPO‐TAG), the primary autoxidation products of triacylglycerides (TAG), have been analyzed in polyunsaturated vegetable oils by means of nonaqueous reversed‐phase high‐performance liquid chromatography (HPLC) with ultraviolet detection. Using a retention time model based on equivalent carbon numbers, mono‐ and bishydroperoxy TAG and hydroxy TAG could be identified. The correlation between the peroxide value (POV) determined by iodometric titration and quantitative HPLC results for HPO‐TAG was established for sunflower oil samples with POV between 0.5 and 50 meq/kg. The recovery of HPO‐TAG in the HPLC procedure was found to be close to 100% in the POV range of 4 to 71 meq/kg. Absolute quantitative results for HPO‐TAG in sunflower oil samples could not be obtained accurately, as molar extinction coefficients of HPO‐TAG occurring in natural oils deviate from those of available HPO‐TAG reference compounds.
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Bauer‐Plank et al. (2000) studied this question.
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