Evaluation of elemental, microbial and biochemical status of raw and pasteurized cow’s milk

Hussain M. S.; Roy B. K.; Khatun A.; Munshi M. K.; Huque R.; Jolly Y.N.; Hossain M. A.; Islam M.; Choudhury T. R.; Hossain A.

Evaluation of elemental, microbial and biochemical status of raw and pasteurized cow’s milk

2018

Milk is a good source of nutrients for the children as well as for adult. In the present study,the concentration of lead, cadmium, chromium, copper, cobalt, nickel, arsenic, mercury, manganese, iron, zinc, calcium and magnesium were measured in both raw and pasteurized cow’s milk by Atomic Absorption Spectroscopy (AAS). Results showed that pasteurized milk was more nutritious with significantly higher (P<0.05) concentration of Ca and Mg and was safer with significant lower concentration of Pb, Cd, and Ni compared to raw milk. In raw milk, Pb had the highest elemental concentration followed by others in the order Ni > Co > Cr > Cd > Cu. Values of As and Hg were below the AAS detection limit for both raw and pasteurized milk samples. The Daily Intake of Metal and Health Risk Index of the elements calculated from the obtained metal concentrations showed no potential to cause health risk to the consumer. Besides elemental analysis, chemical composition and microbial load in cow’s milk were evaluated. The average Total Soluble Solids values of raw and pasteurized milk were 10.26 and 9.87% respectively. Acidity in both raw and pasteurized milk were in acceptable limit (<0.14). Microbiological load in pasteurized milk was less than standard limit (not exceeding 20,000 CFU/ml). Therefore, pasteurized milk from prescribed farm is good quality and safe for human consumption.

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