Verificación del cumplimiento de los requisitos según norma INEN NTE INEN 2395:2011 y NTE INEN 2564:2011 en yogures y bebidas lácteas envasados en fundas de polietileno de baja densidad, comercializados en bares escolares de las unidades educativas públicas de la ciudad de Riobamba.

Abstract

The verification of the fulfillment of the requirements according to NTE INEN 2395:2011 and NTE INEN 2564:2011 in yogurts and milk beverages packaged in law-density polyethylene covers, commercialized in school bars of the public educational units of the city of Riobamba was carried out. The samples were taken in the 5 Educational Units with the most significant number of students, analyzing 6 samples of yogurt and 1 sample of milk drink, from 4 brands. Microbiological counts of quality indicators made: coliforms, Escherichia coli, Staphylococcus aureus, molds, yeasts and mesophilic aerobes using Petrifilm plates. Isolation and counting of lactic acid bacteria (LAB) was carried out through selective culture media MRS and M17, and the confirmation was through the reaction of catalase, oxidase, and Gram stain. Besides, the physicochemical analysis was carried out According to the results obtained, the yogurts and the milk drink if they meet the microbiological analysis quality requirements of the corresponding standards. The LAB count was high in the yogurt of “C1.L.F” which declares to have prebiotics presenting a high count LAB, the milk drink shows a low number of LAB the confirmatory test show the low percentage of bacilli and high in cocci. Additionally, the continuous evaluation of the effect of the LAB on a population of Escherichia coli was made by counting and serial measurements of pH over the course of 20 days, considering the shelf life of the products. Concluding that the LAB are responsible for the inhibition in the growth of the E. coli confirming its antagonistic effect. The two products comply with the provisions of the regulations but do not comply with the nutritional information reported in the labeling; it is recommended to inform those responsible for the sale of these products to control advertising ensuring the health of the consumer.