... UDPGlcNAc, and the assay was initiated by addition of these two nucleotides.Where indicated, the assay was initiated by the addition of the enzyme preparation to an otherwise complete assaymixture. The ... that, because of the presence of saccharo-1,4-lactone, an inhibitor of b-glucuronidase, in the sampleswhere b-glucuronides had to be determined, the amount of b-glucuronidase and the incubation ... and have shown that aminopyrine, metyrapone and otherxenobiotics cause an almost instantaneous increase in the conversion of UDP-glucuronate to glucuronate in isolated rat hepatocytes [4]. The...