All ProZyme glycosidases are purified free of all contaminating glycosidase and protease activities. We additionally strive for the highest purity possible for all of our enzymes even though, for many applications, a high level of purity is not required. In all cases, they are predominantly a single molecular species. The purity of our preparations obviates any need for such stabilizers.
Purity is important for other reasons.
Many modern techniques for carbohydrate analysis, such as mass spectroscopy, are sensitive to or limited by the mass of extraneous protein added to samples. Using the highest purity reagents minimizes these effects. In addition, some researchers wish to treat living cell with glycosidases. Uncharacterized contaminants in the glycosidase preparations could adversely affect the viability of living cells. At ProZyme, purification improvements are an ongoing process, with single species purity the ultimate goal.