| The reaction is then carried out in presence of yeast, which contain two enzymes maltose and zymase. |
| Such material is far more active than the zymase obtained originally by Buchner from the expressed juice of yeast-cells. |
| Although the action of zymase may be regarded as mechanical, the enzyme cannot be produced by any other than living protoplasm. |
| Even now the question remains open whether zymase can be added directly to the established list of enzymes. |
| Thus the yeast plant is supposed to bring about alcoholic fermentation by secreting the enzyme known as zymase. |
| Hans von Euler-Chelpin isolated one part of zymase, which remains active even after heating its solution to the boiling point. |
