abstract |
The present invention provides a composition comprising an enzyme, such as an oxidase enzyme, a zinc and / or ammonium ion source and a lactate ion source. The composition is typically sterilized by exposing the composition to sterilizing radiation, such as gamma radiation. Incorporation of a zinc and / or ammonium ion source and a lactate ion source, such as L-zinc lactate, in the enzyme-containing composition results in improved enzyme activity after sterilization. The presence of a zinc and / or ammonium ion source and a lactate ion source in the composition thus results in a protective effect of the enzyme upon exposure to germicidal radiation and an excellent recovery of enzyme activity. |