Microbiological and physical chemical analysis of pasteurized milk drink without addition, commercialized in Distrito Federal, Brazil

Abstract

Pasteurized dairy drink is an inexpensive way to use the milk whey. In this study, 20 samples of pasteurized milk drink unflavored sold in Distrito Federal were tested to assess whether they were in accordance with the product  standards, set by RTIQ (IN 16/2005). As there are no standards established by ANVISA for this derivative, the results were evaluated from the existing pasteurized milk and those set out in legislation the Ministry of Agriculture and Livestock Supplies (Technical Regulation of Identity and Quality of Instruction criteria 16/2005). Microbiological analysis showed that: 30% of samples were with mesophilic aerobic counts higher than permitted; 35% were with total coliform above the established and 5% in disagreement with the counts of fecal coliform; 35% of the samples showed growth of molds and yeasts. According to physico-chemical analysis, 25% of samples were in disagreement on the fat and all samples performed according to the standards for lactose content. The analysis of enzymes showed that all samples were positive to peroxidase and negative to alkaline phosphatase, indicating that a significant number of samples with excessive contamination (60%) can be attributed to post-processing recontamination. Other analyzes were: not greasy solids (average 8.46%); density (average 1.031g/ml); pH (mean 6.92); Dornic acidity (average 16.5^oD) and lactose (average 4.98%). From this research, it is observed that there is need to include criteria for the classification of pasteurized dairy drink to the rules  of ANVISA and greater accuracy in processing and industrial processing, aiming at offering an innocuous food for consumers.