Qualidade microbiológica, físico-química e detecção de resíduos de antimicrobianos do leite cru e pasteurizado tipo c consumido no Recôncavo da Bahia

Abstract

Milk is a food of high nutritional value and microbial contamination is by inadequate hygienic practices in obtaining them. The consumption of raw milk is a serious problem for public health because it can convey pathogens and antimicrobial residues that are harmful to health. The objective of this study was to evaluate the microbiological, physico-chemical and detect antimicrobial residues in raw and pasteurized milk consumed in 10 cities in the Recôncavo. We performed the determination of total coliform, coliform and Escherichia coli by the technique of multiple pipes and mesophilic microorganisms by scattering in depth. Coagulase positive Staphylococcus were isolated in Baird Parker agar and colonies were subjected to the coagulase test. To check waste antimicrobials used the kit Delvotest ®. The physical and chemical tests determined the acidity, density, fat, total solids and fat. All samples of raw and pasteurized milk were contaminated with total coliforms, thermophilic, mesophilic and Escherichia coli. None presented residues of antibiotics. Of the 50 raw milk samples, 34 (68%) and 6 (30%) of 20 pasteurized milk samples were contaminated by Staphylococcus coagulase positive. Of the 20 samples of pasteurized milk, 40% had non-standard acid, 50% were nonconforming as to density, fat and total solids and 60% for dry extract. Of the 50 samples of raw milk, 66% were outside the standards for acidity, density 38% to 2% as fat, 54% for total solids and 56% for dry extract. These results indicate that the milk from these cities are unfit for consumption by the evidence of fraud and a risk to public health from the presence of pathogenic microorganisms.