13种食用植物油中矿物质元素含量的研究

摘要

A method was developed for the determination of six mineral elements (Mg,K,Ca,Fe,Cu and Zn) in edible vegetable oils using wet digestion and atomic absorption spectrometry.The results showed that the optimal wet digestion conditions were obtained as follows:with HNO3-H2O2 as digestion solution,HNO3dosage 20.00 mL and heating power 500 W.The correlation coefficients (r) were higher than 0.998 in the linear ranges of six mineral elements.The limits of detection (LODs) of six mineral elements were 0.32-21.16 mg/kg.The recoveries of three edible vegetable oils were 82.9％-115.0％,with the relative standard deviations ranging from 1.1％ to 8.8％.The contents of six mineral elements in 13 kinds of edible vegetable oils were studied by the established method,and the results showed that the nutritive value of hemp seed oil was higher with rich minerals.%建立了湿法消解-原子吸收光谱法测定食用植物油中6种矿物质元素(Mg、K、Ca、Fe、Cu、Zn)的分析方法.结果表明:优化的湿法消解条件为以硝酸-过氧化氢作为消解溶液,硝酸用量20.00 mL,加热功率500 W;6种目标物在各自的线性范围内线性关系良好(r≥0.998),检出限为0.32 ～21.16 mg/kg,3种食用植物油加标回收率为82.9％ ～ 115.0％,相对标准偏差为1.1％ ～8.8％.通过该分析方法对13种食用植物油中6种矿物质元素含量进行对比研究,结果发现火麻油中矿物质元素含量较丰富,营养价值较高.