Summary

Eduard Buchner's "Die Zymasegärung" (1897) demonstrates that alcoholic fermentation is driven by soluble enzymes (zymase) present within yeast cells, not by the intact living yeast organism itself. This groundbreaking work shattered the prevailing vitalistic theory of fermentation and established that biochemical processes could occur independently of cellular life. Buchner achieved this by isolating a cell-free extract from yeast that was capable of catalyzing the conversion of sugar into alcohol and carbon dioxide, directly attributing the phenomenon to specific enzymatic agents.

The book details Buchner's meticulous experiments, including methods for preparing the yeast extract and quantitative analyses of its fermentative activity. It provides empirical evidence for the existence of these biological catalysts and their critical role in metabolic reactions. Readers learn that enzyme activity is a fundamental chemical process that can be studied and harnessed outside of the living cell, opening the door for the field of enzymology and biochemistry.

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Key concepts

Zymase — The collective term for the soluble enzyme complex extracted from yeast that catalyzes alcoholic fermentation.
Cell-free extract — A preparation obtained from crushed yeast cells, free from intact living organisms, that still exhibits metabolic activity.
Vitalism — The discredited biological theory that living organisms are fundamentally different from non-living entities because they contain some non-physical element or are governed by different principles than are the inanimate…
Enzymology — The scientific study of enzymes, their properties, and their actions.