≥99% [HPLC]
Used in a medium for the simultaneous membrane filtration enumeration of E. coli and coliforms from drinking water: D.P. Sartory and L. Howard, Lettr. Appl. Microbiol., 15, 273 (1992). For the histochemical localisation of beta-glucuronidase: R.A. Jefferson et al., Proc. Natl. Acad. Sci. USA, 83, 8447 (1986).