Abstract
Sterilization commonly used in hospitals for formula milk has been steam heating at 100°C. We compared the effectiveness of sterilization between the microwave heating process and the regular steam heating process.
(1) The sample was prepared by the suspension of modified milk powder as usual. No bacteria was isolated from the milk prepared by four commercial brands of milk powder sterilized by either the microwave or steam heating process, and held in an electric refrigerator at 5°C for 24 hours.
(2) Each sample was inoculated with each one species of microorganisms as follows ; E. coli, St. faecalis, L. thermophilus, Staphy. aureus, Bac. subtilis and Sacch. cerevisiae.
The microwave heating process was effective for sterilization the inoculated microorganisms except spore-forming bacteria, Bac. subtilis.
(3) The amount of milk adhered to the bottle wall by microwave heating process was more abundant than that by steam heating process.
