Qualidade microbiológica de queijo coalho adquiridos em feira livre no município de Maceió-AL

Abstract

The objective was to determine aspects related to the hygienic-sanitary quality of samples of coalho cheese sold in a street market in the Tabuleiro dos Martins neighborhood in the city of Maceió-AL. The presence of total and thermotolerant coliforms, total mesophiles, Salmonella spp. and Escherichia coli. The samples were submitted to analysis to determine the most likely number (MPN) of total (35°C for 24 hours) and thermotolerant (45°C for 24 hours) coliforms. For Salmonella detection, pre-enrichment with 1% peptone water was performed, followed by enrichment in selenite-cystine (SC) and Tetrathionate broth (TT). Isolation was performed on Hektoen agar (HE) and Salmonella-Shigella agar (SS). For the detection of total mesophiles, the technique of serial dilutions and plating on Agar Standard Count (PCA) was used, and incubation at 28°C. All samples showed growth at different levels, in sample one the presence of coliforms at 35 °C was < 3 MPN/g, 3 MPN/g in sample 2 and 21 MPN/G in sample 3. In the case of thermotolerant coliforms, the samples showed growth of 21 MPN/g in sample 1, 75 MPN/g in sample 2 and 43 MPN/g in sample 3. The presence of Salmonella spp. in any of the samples. As for mesophiles, the average was 4.33 x 109, 4.34 x 109 and 4.36 x 109 CFU/g. The evaluated cheese samples are within the standards recommended.