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A simple method for the determination of the carbonyl value of thermally oxidized fats, using hydroxylamine hydrochloride, is described. Normal octyl alcohol containing pyridine was used as a solvent, and the reaction was allowed to proceed at room temperature for 24 hrs. The titrations were carried out with the aid of a pH meter. The method was standardized against aliphatic aldehydes and ketones. The results of analyses showed that the different pure compounds reacted to an extent of 98% or better at room temperature. The method has been successfully applied for the determination of the carbonyl value of thermally oxidized fats. n‐Valeric acid and the fatty acids with higher molecular weight were not found to interfere in the determination of the carbonyl value by the present method.
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Bhalerao et al. (1961) studied this question.
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