Multi-functional pharmacological credence of triterpenoid 16-hydroxy betulinicacid isolated from Mikania cordata

摘要

OBJECTIVE To isolate and characterize bioactive compound from traditionally impor-tant medicinal plant Mikania cordata,and to investigate muti-faced pharmacological activities of the isolated compound.METHODS A triterpeenoid, 16-hydroxy betulinic acid(16 HBA)was isolated from Mikania cordata leaf and the structure of the compound was determined by NMR spectroscopic means.Antimi-crobial activity of 16 HBA was tested by disc diffusion method and minimum inhibitory concentration (MIC) against the tested microorganisms was determined. The analgesic property of 16 HBA was tested using acetic acid-induced writhes in mice and hot plate thermal stimulation in rats. The anti-inflammatory activity was studied using carrageenin-induced paw edema method. The antipyretic potential of 16 HBA was evaluated by using yeast-induced hyperthermia in rats. RESULTS The triterpenoid 16 HBA showed potent antibacterial activity with inhibition zone of diameter ranging from 12.0~17.5 mm and antifungal activity with mycelial growth inhibition ranges from 37.6%~54.5%.The MIC values for antibacterial and antifungal activities ranged from 31.5~125 and 250~1000 μg·mL-1respectively.The compound(50 and 100 mg·kg-1body weight)showed potent peripheral and central analgesic activity having 55.19% and 41% of writhing inhibition at 90 min after administration of the compound and the highest 55.98%, 79.18% elongation of reaction time,respectively.In anti-inflammatory activity screening,the compound (100 mg·kg-1)revealed the highest 77.08% edema inhibition at 4 h after administration of carrageenan. In antipyretic assay, 16 HBA exhibited a strong antipyretic effect in yeast-induced rats.CONCLUSION The present study confirmed that 16-hydroxy betulinic acid isolated from Mikania cordata has potent anti-microbial,analgesic,anti-inflammatory and antipyretic properties.Our results can be seen as scientific support for the traditional and folklore usage of Mikania cordata in Bangladesh for the treatment of different ailments and provide opportunities to explore this plant as a source bioactive compounds for biochemical and pharmaceutical industries.