Enzymes Of Yeast. This section is from the book Alcohol, Its Production, Properties, Chemistry, And Industrial Applications, by Charles Simmonds. Also available from Amazon: Alcohol: Its Production, Properties, Chemistry, And Industrial Applications. It is to these important substances that yeast owes its inverting and fermentative properties. They include sucrase (invertase), zymase, maltase (glucase), lactase, hexosephosphatase, reductase, carboxylase, melibiase, and endo-tryptase, as well as proteolytic enzymes, which have already been mentioned in the general description of the enzymes.