How To Destroy Bacteria
Destruction of bacteria Heat Pasteurization (destroys pathogens) Sterilization (destroys all bacteria, spores and toxins) Canning (commercially […]
Food Safety
Food Safety
pH Requirements of Bacteria
· Most bacteria prefer pH around 7 (neutral) · When foods have a lower pH the yeasts and moulds
Food Safety
Water Activity for Bacteria
Water Activity Freely available water in the food · If salt/sugar is added the water binds tightly to it
Food Safety
Oxygen requirements of bacteria
Oxygen requirements of bacteria Obligate aerobe Grows only in the presence of oxygen Most moulds and some yeasts
Food Safety
Bacterial Growth Curve
The Bacterial Growth Curve When conditions are right bacteria begin to multiply · The increase in numbers
Food Safety
The Effect of Temperature on Bacteria
Effect of temperature on bacteria 100°C Temperature at which water boils 82°C Disinfection using hot water Legal requirement