Abstract:
This research was purposed to develop the Cenththeca lappaceaL.standard extract for cosmetic application. Cosmetic active compounds from the plant were extracted by using sonication at room temperature to assist the extraction efficiency and the extraction was carried out between 1-24 h. Two solvents of 95% ethanol and DI water were compared in their extraction capacity. Water extract of leave at 6 h duration provided the highest yield at 25.30 % w/w, while the least recovery of 9.40% w/w was obtained from water extract of root at 24 h duration. The highest phenolic content was found in the ethanolic extract of the leave showing the values between 30.33-49.63 mg GAE/g. The lowest phenolic content was found in the root extract which appeared the values in ranges of 11.98-34.22 mg GAE/g. Radical scavenging capacity assay revealed that the leave extract exhibited the highest activity with the IC50 of 0.088 mg/mL, followed by those of the stalk and root extracts of 0.177 and 0.218 mg/mL, respectively. In comparison with the standard trolox, it showed the IC50 of 0.102mg/mL. Tyrosinase inhibitory activity assay showed the stalk extract gave superior activity to those of the leave and root. The IC50 of ethanolic stalk extract was found to be 0.145 mg/mL which was comparable to that of standard kojic acid (0.095 mg/mL). HPLC analysis demonstrated that the C. lappacea extracts
contained several types of phenolic compounds. Besides the known of catechin, catechin gallate, apicatechin gallate and rosemarinic acid, there were a lot of unknown active components.