Detection of Bacillus cereus in milk and evaluation of the germination of its spores to the ambient and refrigeration temperatures after process of boil / Detecção de Bacillus cereus em leite e avaliação da germinação de seus esporos à temperatura ambiente e sob refrigeração após processo de fervura

AUTOR(ES)

Milena Martinelli Watanuki

DATA DE PUBLICAÇÃO

2008

RESUMO

The microbiological analysis acts as basic tool for the attainment of data on the quality, health, hygiene and security in the food production, in such a way, she has been adopted in the nourishing industry for the quality control. For its complete and balanced composition, milk is an ideal substratum for the development of diverse groups of microorganisms. With the objective to search cereus bacteria of the Bacillus species in fluid milk samples, as well as the capacity of germination of spores and the multiplication of this bacterium after boil process, with maintenance of the samples to the ambient temperature and the temperature of refrigeration for periods of 1, 2, 4, 6, 8, 10 and 12 hours, 75 milk samples had been analyzed, as the methodologies recommended for Silva et al. (2007). Of these, 46 samples (61.3%) had revealed with some degree of contamination for the bacterium before being submitted to the boil. In turn, the samples kept to the ambient temperature after the boil, had its bacterial countings, mainly from 8a hour, superiors to the initial counting, also reaching levels capable to unchain an alimentary toxinfection, demonstrating to the occurrence of the germination of the spores and the multiplication of the vegetative cells. On the other hand, aliquot of these same samples kept under refrigeration (7ºC) had not reached preoccupying populations, emphasizing, in this manner, the importance of the necessity of the refrigeration of milk after the boil.

ASSUNTO(S)

milk bacillus cereus. esporos bacterianos germinação microbiologia de alimentos. germination boil bacillaceae spores leite

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