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