微波消解火焰原子吸收光谱法测定几种猕猴桃中铜和钙
2014-04-29陈仕海
陈仕海
摘要 [目的]建立微波消解猕猴桃样品,FAAS法测定猕猴桃中的钙元素和铜元素含量的方法。[方法]以浓硝酸为溶剂,微波消解猕猴桃样品,标准曲线法测定,优化了样品消解条件和原子吸收测定的参数。[结果]测定表明,金艳、红阳、金果3种猕猴桃中的铜含量为0.058、0.076、0.063 mg/g,钙含量分别为1.812、1.530、1.539 mg/g,回收率为94%~106%,RSD为3.3%~4.7%。[结论]该测定方法简单可行、结果准确,可用于测定猕猴桃中的铜和钙含量。
关键词 火焰原子吸收光谱法;猕猴桃;微波;钙;铜
中图分类号 S663.4 文献标识码
A 文章编号 0517-6611(2014)27-09555-02
Determination of Ca and Cu Elements in Different Varieties of Kiwi Fruits by Microwave Digestion FAAS
CHEN Shihai
(Sichuan Liwu Copper Co. Ltd, Jiulong, Sichuan 616200)
Abstract [Objective] To establish a method of determination of calcium, copper in kiwi fruits by microwave digestionflame atomic absorption spectrometry. [Method] The sample was diluted by microwave with HNO3and the contents were determined by calibration curve method. By performing a series of experiments on the parameters of digestion conditions and atomic absorption of samples, the optimal parameters of digestion conditions and atomic absorption were determined. [Result] The results of determination showed that the copper content in Jinyan, Hongyang and Jinguo were 0.058, 0.076 and 0.063 mg/g, respectively, and the calcium content were 1.812, 1.530 and 1.539 mg/g separately. Recoveries are 94%-106% and RSD are 3.3%-4.7%. [Conclusion] The method is feasible and the result is accurate, which can be used for determining copper and calcium content in kiwi fruits.
Key words FAAS; Kiwi fruits; Microwave; Calcium; Copper
猕猴桃富含VC和VE,具有延缓衰老的抗氧化功能,VC更能够强化免疫系统,促进伤口愈合和对铁质的吸收,维持骨骼和牙龈的健康。猕猴桃中膳食纤维含量很高,有利于人们的肠道健康,也有利于降低体内血脂含量。猕猴桃富含的氨基酸,可抑制抑郁症,补充脑力所消耗的营养。此外,猕猴桃还含有对人体很重要的钙元素和铜元素[1-2],铜元素是人体系统中一种独特而极为有效的催化剂,是人体细胞内许多酶类的必需成分[3]。钙元素是人体骨骼、牙齿的重要组成元素,也是一些酶和辅酶的催化剂[4]。笔者以金艳、金果和红阳3种不同品种猕猴桃为试验材料,采用微波消解-火焰原子吸收光谱法测量这3种猕猴桃中钙和铜含量。
1 材料与方法
1.1 材料
1.1.1 供试原料。金艳、金果和红阳3种猕猴桃均采于四川蒲江同一种植田,时间为2013年11月18日,在种植田挑选果实饱满、无机械损伤、无畸形和病虫害并且成熟度基本一致的猕猴桃。……
