Enzyme assays are laboratory measurements that quantify the catalytic activity of an enzyme by determining how rapidly it converts substrate to product under defined conditions. Because Enzymes are protein catalysts that accelerate biochemical reactions, their activity is most usefully expressed as a rate, and assay…
Enzyme assays are laboratory measurements that quantify the catalytic activity of an enzyme by determining how rapidly it converts substrate to product under defined conditions. Because Enzymes are protein catalysts that accelerate biochemical reactions, their activity is most usefully expressed as a rate, and assays are designed to capture this rate reliably and reproducibly. Methods are grouped by how the reaction is followed: continuous assays track product formation or substrate consumption in real time, often through spectrophotometric, fluorometric, or coupled-reaction readouts, while discontinuous or endpoint assays sample the reaction after a fixed interval, increasingly using chromatographic and mass-spectrometric detection. Assays may also be classified by the chemistry being monitored, such as hydrolysis of polysaccharides by glycoside hydrolases like cellulases and xylanases, or oxidation and halogenation by oxidoreductases such as peroxidases. Accurate measurement depends on controlling temperature, pH, ionic conditions, and substrate concentration, and on operating within the linear range of the reaction. Kinetic parameters derived from these data characterize an enzyme's efficiency and its response to inhibitors, activators, and immobilization on supports. Enzyme assays underpin applications across basic research, biocatalysis and industrial biotechnology, quality control, and clinical diagnostics, where enzyme activity serves as a marker of biological state. As the principal means of quantifying catalysis, they are foundational to enzymology.
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