Denature (verb)

1. To change the natural properties or characteristics of a substance, especially by chemical means.
2. To alter the natural state of a substance or organism.

Origin:

From de- + nature.

Examples:

1. The protein was denatured by heating it to high temperatures.
2. The alcohol was denatured by adding chemicals to it.
3. The enzyme was denatured by changes in pH.
4. The DNA was denatured by heating it up.
5. The virus was denatured by exposing it to UV light.