Determination of Vitamin A and E in fodder concentrates and cow milk from region of Kumanovo, North Macedonia

The main objective of this research was to determinate the vitamins A and E in fodder concentrate and raw cow milk from region of Kumanovo, Macedonia. As material for this research, samples of feed and samples of cow\u27s raw milk from the cattle fed with the same food were taken. The test material was taken from a farm in the region of Kumanovo. Vitamins А and Е have been examined with the methodology of extraction on HPLC – Perkin Elmer, pump: series 200LC, auto sampler; ISS – 200, detector LC – 135/LC -235 C DA. The amount of vitamin A in fodder concentrate was 7.5438 mcg/100 g, while the amount of vitamin E was 23.115 mcg/kg. The amount of vitamin A in raw cow milk from region of Kumanovo was 30 mcg/100g, while the amount of vitamin E was 0.86 mcg/100g

Determination of Some Chemical Elements at Milk, at Three City in Macedonia (Kumanovo, Tetovo, Gostivar)

The aim of this research was to evaluate the possible contamination by heavy metals of milk from cows in Macedonia. The concentrations of heavy metals were determined in cow milk from the different farms, at three city (Kumanovo, Tetovo, Gotivar)in Macedonia. Each sample, homogenized and powdered, was mineralized in a microwave oven. Quantitative analyses of Cd, Cr, Cu and Pb were performed using an atomic absorption spectrophotometer with graphite furnace; As was analyzed by hot vapor generation technique and Zn with the flame method. The concentration of many metals is low (\u3c0.1 mg/kg) such as: As,Co, Cd, Cr, Cu,Fe, Pb, and Zn