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首页> 外文期刊>Journal of Food Lipids >Determination of carbonyl value in rancid oils: a critical reconsideration.
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Determination of carbonyl value in rancid oils: a critical reconsideration.

机译：腐臭油中羰基值的测定：关键性的重新考虑。

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摘要

Different grades of 1-butanol and 2-propanol (2-PrOH) with or without purification were reevaluated for the preparation of blank solutions in a modified method for the determination of carbonyl value (CV) in rancid oils (soyabean oil and a frying oil). Only purified 2-PrOH with an absorbance lower than 0.35 at 420 nm was considered suitable as a solvent. Good correlations existed between absorbance at 420 nm and molar concentration for 2-decenal and 2,4-decadienal solutions in 2-PrOH reacted with 2,4-dinitrophenylhydrazine. The sensitivity of the method with 2-decenal was higher than that with 2,4-decadienal. The CVs calculated based on 2,4-decadienal were higher than those of 2-decenal, although the differences between them were not statistically significant at low levels. Accordingly, the sensitivity of the measurement and the estimated CV content were dependent on the type of standard considered. Triphenylphosphine (TP) exerted a statistically significant effect on the CVs of soyabean oil, unless the peroxide content of the oil sample was very low or much higher than the amount of added TP. The addition of TP to the frying oil was not necessary because the conditions of the CV test did not lead to the production of excess carbonyl compounds caused by the degradation of peroxides..
机译：重新评估了不同等级的1-丁醇和2-丙醇（2-PrOH）的纯化或未纯化，用于制备空白溶液的改进方法，用于测定腐烂油（大豆油和煎炸油）中的羰基值（CV） ）。仅认为在420 nm处吸光度低于0.35的纯化2-PrOH作为溶剂。在2-PrOH中与2，4-二硝基苯肼反应的2-癸烯和2,4-癸二烯溶液在420 nm处的吸光度和摩尔浓度之间存在良好的相关性。该方法在2-癸烯中的灵敏度高于在2,4-癸二烯中的灵敏度。基于2，4-癸二烯的CV值高于2-癸烯的CV，尽管它们之间的差异在低水平时无统计学意义。因此，测量的灵敏度和估计的CV含量取决于所考虑标准的类型。三苯膦（TP）对大豆油的CV具有统计学上的显着影响，除非油样品中的过氧化物含量非常低或远高于所添加TP的量。不必在煎炸油中添加TP，因为CV测试的条件不会导致由过氧化物的降解引起的过量羰基化合物的产生。

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