| Abstrakt: |
Milk is a food rich in oligoelements (approx. 1g/100 ml) that can vary in concentration due to genetic factors, type of feed, fed to cattle and due to contamination in the area of production. Since the margin between the concentration of mineral requirements and the toxic levels is so narrow that a little excess results harmful to sensitive species, the present study was done in the city of Monterrey, N.L. located in an industrial zone. Samples of raw milk from 17 producers distributed in 8 zones were analyzed during 6 months, measuring minerals of nutritional and toxicological importance. All elements were determined using atomic absorption, except for phosphorus, which was quantified colorimetrically. Statistical significance was determined through analysis of variance and Duncan test. The average mineral composition of the milk analyzed was (mg/Lt): calcium 1179, magnesium 109.7, zinc 5.89, phosphorus 637.1, copper 0.15, cadmium < 0.01, chromium < 0.02, iron 0.59, lead < 0.04, manganese < 0.02, nickel 0.36. The milk of this region is a good source of calcium, magnesium, phosphorus and zinc, with 35%, 7.4%, 19% and 9% respectively of the RDA being obtained from a 237 ml portion of milk. |
