>98% [HPLC]. Free PNP < 200ppm.
Substrate for beta-N-acetylglucosaminidase: C.S. Jones et al., J. Biol. Chem., 255, 11861 (1980). Used to distinguish Candida species: K. Niimi, M.G. Shepherd and R.D. Cannon, J. Clin. Microbiol., 39, 2089 (2001). Chitobiase substrate: S. Drouillard et al., Biochem. J., 328, 945 (1997).