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), IC50 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.

Uses of Coconut Residue from Coconut Oil with Extracted <i>Curcuma longa</i> Production for Juvenile Red Claw Crayfish Feeding

“…Coconut milk (5 kg of coconut endosperm: 5 L of water) was stored at room temperature for 24 h to separated cream and water [2]. Cream was centrifuged to obtain coconut oil and coconut residue as solid.…”

“…For the conventional method, curcumin from Curcuma longa was extracted with organic solvent which was dangerous to the environment and experimentee. To solve this problem, coconut milk was used as a solvent to extract phenolic compound from Curcuma longa to obtain coconut oil enriched with phenolic compounds as called coconut oil with extracted from Curcuma longa [2]. Large amounts of coconut protein residues with high protein was the by-product from the extracted oil [3,4].…”