火焰原子吸收光谱法测定Borojo果及其制品中的8种微量元素

Determination of Eight Trace Elements in South American Fruit Borojo by FAAS

摘要:

Borojo果是一种天然的高钾低钠水果，是补充钾、钙和镁优良的食品来源。本文用火焰原子吸收光谱法测定Borojo果及其制品中铜、铁、镁、锌、锰、钾、钠、钙8种微量元素的含量，为Borojo果功效开发及深加工提供科学依据。样品经硝酸消解过夜，重复测定6次，计算精密度。方法前处理简单快速，重复性好，试剂用量小，加标回收率在94%~104%之间，相对标准偏差≤3.15%。Borojo冷冻干燥粉中8种微量元素分别是果肉的3倍左右。酶解浓缩粉中微量元素高于冷冻干燥粉，铜、锌分别高5和7倍；锰、镁、钾、钙、铁分别高1.08，1.16，1.22，1.12和1.23倍，钠高了55倍。Borojo果肉、冷冻干燥粉和酶解浓缩粉中的钾：钠比分别为2435:1，2870:1和63:1。8种微量元素比例同金丝枣、榴莲和干枣中相似，且比后者含有更多的镁。

Abstract:

Borojo fruit is a natural fruit which contained high potassium and low sodium which is a good food source for supplement of potassium, calcium and magnesium. To detect the content of eight kinds of trace elements by FAAS: copper, iron, magnesium, zinc, manganese, potassium, sodium, calcium in Borojo fruit and its products, and to provide a scientific basis for the development and deep processing of Borojo efficacy. Samples were digested by nitric acid overnight and were detected for six times by flame atomic absorption spectrometry. The pre-treatment method was rapid, reproducible and reagentless. The recovery was between 94% and 104% and the relative standard deviation was no more than 3.15%. The contents of eight trace elements in Borojo freeze-dried powder were about 3 times more than those in the fruit. The concentrations of trace elements in enzymatic hydrolysis concentrated powder were higher than that in freeze-dried powder. The copper, zinc, manganese, magnesium, potassium, calcium, iron and sodium in concentrated powder were 5, 7, 1.08, 1.16, 1.22, 1.12, 1.23 and 55 times respectively higher than those in freeze-dried powder. The ratios of potassium to sodium in Borojo fruit, freeze-dried powder and concentrated powder were 2435:1, 2870:1 and 63:1, respectively. The proportion of eight trace elements in Borojo was similar with that in ziziphus jujube, durian and dried dates, while Borojo contained more magnesium.