This study investigated the antioxidant capacity and safety parameters (toxicity) of Cinnomomum iners standardized leaves methanolic extract (CSLE) to provide information regarding long term usage of this plant. CSLE exhibited high total phenolic (211.94±12.04 mg GAE g-1 plant material) and flavonoid (13.38±0.08 mg CE g-1 plant material) contents. The antioxidant activity of CSLE was evaluated using DPPH, H2O2 and reducing power assay. CSLE showed potent antioxidant activity with IC50 value of 0.5±0.26 mg mL-1 and 1.00±0.31 mg mL-1 in DPPH assay and H2O2 study, respectively. The electron donating capability (reducing power) of CSLE was found to be higher than standard antioxidant (vitamin E). The toxicity screening of CSLE was conducted using brine shrimp assay, acute toxicity screening and histopathologic study. An acute toxicity study was carried out by using OECD guideline 423. The LC50 and LD50 values of CSLE were found to be 2.59±0.3 mg mL-1 and > 5000 mg kg-1, respectively. The organ body weight of the CSLE treated mice shows no considerable difference with control group mice. This shows that CSLE does not affect the weight of the mice. No mortality or significant signs of acute toxicity was observed during the 14 days observation period. On the day 14, all the mice were dissected and organ as heart, liver, kidney, spleen and lung were withdrawn for the calculation of organ body index. The organ body index obtained showed that no significant difference with control. Withdrawn organ was subjected to histopathological study. Histopathological analysis of organs did not show any pathological changes. The results obtained in present study indicate that CSLE is very good antioxidant source with high margin of safety.
F. Mustaffa, J. Indurkar, S. Ismail, M.N. Mordi, S. Ramanathan and S.M. Mansor, 2010. Antioxidant Capacity and Toxicity Screening of Cinnomomum iners Standardized Leaves Methanolic Extract. International Journal of Pharmacology, 6: 888-895.