Total phenolic content and antioxidant activity of coconut oil enriched with some extracts of curcuma species in Thailand

Abstract

Coconut oil enriched with phenolic compounds from some curcuma species can be used in cosmetic products or food supplement. The objectives of this work were to produce coconut oil incorporated with some extract of curcuma species including Curcuma aromatica Salisb, Curcuma longa L., Curcuma xanthorrhiza Roxb., Curcuma Zediaria Roscoe, Cucuma aeruginosa Roxb, Curcuma aurantiaca Van Zijip., and Cucuma parviflora Wall H., and to determine the antioxidant activity and the total phenolic content of the coconut oil obtained. The antioxidant activity of resulting coconut oil was assayed with DPPH (2,2-diphenyl-1-prohydrozyl), and ABTS. Antioxidant activity with ABTS and DPPH calculated in IC50 (the concentration of an antioxidant at with 50% inhibition of free radical activity), IC 50 values at 30 min was found in the range of 0.35 to 13.58 mg/ml and 2.66 to 179.40 for ABTS and DPPH, respectively. The results showed that the coconut oil with extracted Curcuma Zediaria Roscoe had the highest antioxidant activity calculated in IC50, 0.35 mg/ml and 2.66 for ABTS and DPPH radical scavenging assay, respectively. Based on the Folin-Ciocalteu method, the total phenolic content was found in the range of 2.95 to 132.42 mg/g oil. Coconut oil with extracted Curcuma Zediaria Roscoe had the highest total phenolic content (132.42 mg/g oil) among other species.