Lutfullah Ghosia, Khan Abid Ali, Amjad Azra Yasmeen, Perveen Sajida
Centre of Biotechnology & Microbiology, University of Peshawar, Peshawar 25120, Pakistan.
Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan.
ScientificWorldJournal. 2014;2014:715845. doi: 10.1155/2014/715845. Epub 2014 May 20.
Various essential and toxic heavy metals (Ca, Mg, Cu, Zn, Fe, Mn, Pb, Cd, Cr, and Ni) contents in various types of dried (infant formula and powdered) and fluid (fresh and processed) cow milk were assessed by atomic absorption spectrophotometry. The milk samples were collected from local markets of different parts of Peshawar city, Pakistan. Heavy metal concentrations varied significantly depending upon the type of milk. The heavy metal concentrations in most of the samples were within normal and permissible ranges. It was observed that the samples contained considerable amounts of calcium, while magnesium levels were well above the required levels. The results also revealed that copper levels were slightly lower than the permissible limits. The concentration of zinc in dried milk samples was greater than the values for the liquid milk types. Infant milk formulae had higher iron levels as compared to other milk samples because of the added constituents. Significant differences were observed in the mean values of manganese and cadmium in different types of milk. The toxic metals were within the acceptable limits and did not show significant levels leading to toxicity.
采用原子吸收分光光度法评估了各类干制（婴儿配方奶粉和奶粉）及液态（新鲜和加工过的）牛奶中各种必需和有毒重金属（钙、镁、铜、锌、铁、锰、铅、镉、铬和镍）的含量。牛奶样本采集自巴基斯坦白沙瓦市不同地区的当地市场。重金属浓度因牛奶类型的不同而有显著差异。大多数样本中的重金属浓度在正常和允许范围内。观察到样本中含有大量钙，而镁含量远高于所需水平。结果还显示，铜含量略低于允许限值。干制牛奶样本中的锌浓度高于液态牛奶类型的值。由于添加了成分，婴儿配方奶粉中的铁含量高于其他牛奶样本。不同类型牛奶中锰和镉的平均值存在显著差异。有毒金属在可接受范围内，未显示出导致毒性的显著水平。
