Beta-glucuronidase involved in the initiation of H(2)O(2) metabolism via the production of baicalein. Unable to use glycyrrhizin, gypsogenin-3-O-D-glucuronide, luteolin-7-O-D-glucoside and apigenin-7-O-D-glucoside as substrates. baicalin + H2O = baicalein + D-glucuronate + H(+) kcat is 639 sec(-1) for baicalein 7-O-beta-D-glucuronide. Optimum pH is 7.0-8.0. Homotetramer. Belongs to the glycosyl hydrolase 79 family.