Heat can kill microbes by altering their membranes and denaturing proteins. The thermal death point (TDP) of a microorganism is the lowest temperature at which all microbes are killed in a 10-minute exposure. ... These parameters are often used to describe sterilization procedures that use high heat, such as autoclaving.

Why does bacteria die at high temperatures?

When the temperature gets hot enough, the enzymes in the bacterium are denatured, meaning they change shape. This change renders them useless, and they're no longer able to do their work. The cell simply ceases to function. Heat can also damage the bacterium's cell envelope.

Does heat always kill bacteria?

The illness is generally not serious. While heat kills most bacteria, the staph toxin is not destroyed by ordinary cooking. ... Bacteria is often found in raw or undercooked foods such as poultry, eggs and meat, as well as unpasteurized milk. Control is simple, though, because thorough cooking kills salmonella.