1. activity test Creative Enzymes performs the most reliable measurement of enzyme activities for a variety of application purposes. The unique technology platform provides accurate and reproducible results on the activity levels. In addition, our vast library of enzymes and their substrate and cofactors ensure fast activity determination in large batches. With state-of-the-art analytical instruments and facilities, we are able to satisfy your unique requests on activity measurement, including cGMP and cGLP compliant services. Altogether, the knowledge, technology, and hardware mark the worldwide leading position of Creative Enzymes in the service of enzyme activity measurement. Enzymes are critical to almost all cellular processes, including gene expression, metabolism, and cell signaling, which makes enzymes the targets with growing significance in drug development and other therapeutic areas. Therefore, exact quantification of enzyme activity is the key step to many tasks in Quality Control (QC) and Research and Development (R&D). However, activity measurement could be challenging due to the complexity of enzyme reactions. Enzymes catalyze all kinds of chemical reactions with high specificity and efficiency. In most cases, enzymes employ cofactors, which are also known as coenzymes or prosthetic groups, to facilitate binding and interacting with the substrate. Besides the main substrate, some enzymes simultaneously react with additional substrates, which may be called cosubstrates or cofactors in some cases, and eventually release the products and byproducts by the end of the reaction.