Related Experiment Video
Updated: May 26, 2026

Novel Production Protocol for Small-scale Manufacture of Probiotic Fermented Foods
Published on: September 10, 2016
Reduction of pasteurization temperature leads to lower bacterial outgrowth in pasteurized fluid milk during
N H Martin1, M L Ranieri, M Wiedmann
1Milk Quality Improvement Program, Department of Food Science, Cornell University, Ithaca, NY 14853, USA.
Abstract:
Bacterial numbers over refrigerated shelf-life were enumerated in high-temperature, short-time (HTST) commercially pasteurized fluid milk for 15 mo before and 15 mo after reducing pasteurization temperature from 79.4°C (175°F) [corrected] to 76.1°C (169°F). Total bacterial counts were measured in whole fat, 2% fat, and fat-free milk products on the day of processing as well as throughout refrigerated storage (6°C) at 7, 14, and 21 d postprocessing. Mean total bacterial counts were significantly lower immediately after processing as well as at 21 d postprocessing in samples pasteurized at 76.1°C versus samples pasteurized at 79.4°C. In addition to mean total bacterial counts, changes in bacterial numbers over time (i.e., bacterial growth) were analyzed and were lower during refrigerated storage of products pasteurized at the lower temperature. Lowering the pasteurization temperature for unflavored fluid milk processed in a commercial processing facility significantly reduced bacterial growth during refrigerated storage.
Related Concept Videos
Physical Methods for Controlling Microbial Growth: Temperature
Microbes in Food Production
Microbial Spoilage of Food
Factors Influencing Microbial Growth: Temperature
Key Techniques in Microbiology
Microbes in the Production of Fermented Foods

