Determination of the Levels of Selected Trace HeaMetals and Fat Content in Commercially Available Milk Brands in Addis Ababa City, Ethiopia.
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Date
2018-04-02
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Addis Ababa University
Abstract
Six different pasteurized milk brands were analyzed for their trace heavy metals concentration
and fat content. The concentration of heavy metals such as Zn, Cu, Cr, Cd, Pb and Ni was
determined by using flame atomic absorption spectrophotometer. The elements Cu, Cr, Cd, Pb
and Ni were not detected in all milk brands under the study. The concentration of zinc in Etete,
Family, Harme, Shola, Holland and Mama milk brands were found to be 3.31± 0.671, 3.31±
0.408, 2.12 ± 0.692, 2.26 ± 0.224, 2.42 ± 0.731 and 1.93 ± 0.382 in μg/g, respectively. There is
no significant difference at 95% confidence interval (p > 0.05) in the mean concentrations of zinc
among the milk brands. The results obtained for the detected element in the present study were
also compared with European Food Safety Authority maximum permissible limit to check
whether it is below or above the set limit and were found below the allowed recommended limit.
The validity of the digestion process was checked by recovery test. The percentage recovery of
zinc was found to be 98.87% which is found in the acceptable range. The fat content of each
milk brand was determined and found to be 2.4%, 2.8%, 2.8%, 2.8%, 2.6% and 3% in Etete,
Family, Shola, Harme, Holland and Mama, respectively. The fat content of the different milk
brands were found to be in the order of Mama > Family = Shola = Harme >Holland > Etete. The
analysis of variance result showed that no significant difference was observed in the mean
amount of fat content among all milk brands.
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Keywords
Heavy Metals, Pasteurized Milk, Acid Digestion, Faas, Fat Content