0.50.00.51.0UAOAoridoninFig. 9 – Relationships between the absolute temperature(1/T) and the second-order extraction rate constant (ln k) forthe extraction of OA, UA and oridonin from R. rubescens.and UA. This tendency is consistent with their polarities, asreflected in Table 4. The value obtained for R. rubescens washigher than that reported for the UAE of ursolic acid from O.sanctum (Vetal et al., 2012).3.5. Cardiovascular effects of oleanolic acid obtainedfrom R. rubescens by using HUAE extractionCardiovascular effects of the oleanolic acid obtained fromR. rubescens by using HUAE were evaluated to confirm thebioactivity. As shown in Fig. 10, the extracted oleanolic acid(3 mg/kg body weight) significantly decreased the arterialblood pressure in urethane anesthetized rats.
Table