1. adh activity Creative Enzymes is renowned for its particular service of measuring the activity of alcohol dehydrogenases using spectrophotometric assays. Our activity test results are highly accurate and reproducible, thanks to many years of service experiences in this field. With our core technology, we are leading the activity assays of alcohol dehydrogenases with a variety of choices of substrates for a pure alcohol dehydrogenase or for an enzyme in a mixture.