Free PNP < 200ppm. Rotation [α]D +217o +/- 5o.
Substrate for alpha-glucosidase: D.E. Oliveira et al., Anal. Biochem., 113, 188 (1981). For alpha-glucosidase in urine in relation to Pompe's disease: A.W. Schram et al., Biochem. Biophys. Acta., 567, 370 (1979).