Section 68
Chapter 67,691

Destruction de Microbacterium lacticum , Escherichia coli et Staphylococcus aureus au cours du schage du lait par atomisation. Ii. Influence des conditions de schage

Chopin, A.; Mocquot, G.; Graet, Y.L.

Canadian Journal of Microbiology 23(6): 755-762


ISSN/ISBN: 0008-4166
DOI: 10.1139/m77-112
Accession: 067690952

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Bacterial death during spray drying of skim milk is essentially related to the outlet temperature of the spray drier and the type of bacteria. Under industrial spray drying conditions, survival rates of Microbacterium lacticum, Staphylococcus aureus and Escherichia coli were 50, 2, and 0.002%, respectively. These rates may vary by a 104 factor for outlet temperatures between 65 and 105 °C. No simple mathematical equation could be derived to describe the relation between bacterial death rates and outlet temperature. Our results suggest that bacterial death is due in most cases to a heating effect during the last stages of drying when the temperature of the powder particle approaches that of the air at the outlet.

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