- noun a protein substance produced by living cells which promotes a biochemical reaction in living organisms
- A natural protein which speeds up the rate of chemical reaction under moderate conditions of temperature, such as oxidation, browning of apples, decolorizing of vegetables, etc. They are easily inactivated by extremes of pH, high concentrations of salt, addition of alcohol or most importantly by temperatures of 80°C or above
- noun a protein substance produced by living cells which aids a biochemical reaction in the body
- a protein produced by yeast during fermentation that acts as a catalyst to start and control the chemical reactions to convert the sugar in the grape juice into alcohol. Enzymes are also responsible for reactions in almost all plant and animal tissue during metabolism.