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Pasteurization Efficiency of a HTST System for Human Milk

1996; Wiley; Volume: 61; Issue: 3 Linguagem: Inglês

10.1111/j.1365-2621.1996.tb13160.x

1750-3841

Jyoti Dhar, J. Fichtali, B.J. Skura, S. Nakai, A. George F. Davidson,

Respiratory viral infections research

ABSTRACT An economical, small scale heat processing device was studied for rapid and efficient pasteurization of human milk while preserving immunoglobulins A,G and M. Using a continuous flow HTST milk pasteurizer, human milk inoculated with E. coli (10 6 CFU/mL) or S. aureus (10 7 CFU/mL) was heated at 71°C at flow rates of 5.9, 12.3 and 18.9 mL/ min. All conditions completely inactivated both microorganisms and resulted in negative alkaline phosphatase activity indicating complete pasteurization. Heat processing of bovine milk at 71°C, at 5.9 mL/min resulted in retention of 30% of the γ‐glutamyl transpeptidase (GGTP) activity. Lower residual activity could therefore indicate overpasteurization. Pasteurization at 71°C for 9.0 sec (12.3 mL/min) resulted in retention of 74% of IgA, 75% IgG, and 68% IgM.