≥99% [HPLC]. Free PNP < 200ppm.
Substrate for beta-glucosidase from spruce seedlings: S. Marcinowski and H. Grisenbach, Eur. J. Biochem, 87, 37 (1978). From edible straw mushroom: Y.J. Cai et al., Enzyme Microb. Technol., 22, 122 (1998): From Bacillus circulans KA-304, K. Mizuno et al., Biosci. Biotechnol. Biochem., 62, 39 (1998).