Related Experiment Video
Updated: Jan 26, 2026

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
Published on: February 7, 2013
Inhibition of Growth of Staphylococcus aureus during Production of Acidophilus Yogurt. 1
R Attaie1, P J Whalen1, K M Shahani1
1Department of Food Science and Technology, University of Nebraska, Lincoln, Nebraska 68583-0919 and McGill University, Montreal, Canada.
Abstract:
Inhibition of growth of a pathogenic strain of Staphylococcus aureus and production of a metabolite, thermostable deoxyribonuclease (TDNase), in acidophilus yogurt and yogurt were investigated. The causative factors of inhibition (lactic acid, hydrogen peroxide and bacteriocin) were assessed. Accumulation of hydrogen peroxide after 2 h of fermentation was 0.88 p-g/ml, which caused a significant difference in the population of S. aureus between yogurts with and without catalase. Growth of S. aureus in the acidified yogurt was reduced after 4 h of fermentation when the pH of the medium was 4.8 or lower. Significant differences were found for the S. aureus populations of the acidified treatment and acidophilus yogurt with catalase suggesting that inhibition was due to bacteriocin(s) produced during the yogurt fermentation. The TDNase was significantly lower in the acidified yogurt and was totally inhibited in the three cultured yogurts during the fermentation period.
Related Concept Videos
Predicting Products: SN1 vs. SN2
With increased substitution on the alkyl halide,...
Feedback Inhibition
Enzyme Inhibition
Population Growth
Primary and Secondary Growth in Roots and Shoots
Inhibition of Cdk Activity

