Optimized Extraction of Curcuminoids from Curcuma Longa L.by Orthogonal Designed Method and Its Antioxidant Activity / 医药导报

ABSTRACT

Objective To investigate the optimal extraction technique and antioxidant activity of curcuminoids from Curcuma longa L. Methods The optimized extraction process of curcuminoids from Curcuma longa L. with ethanol as extracting solvent were studied based on orthogonal test.The effect of each factor such as the ethanol concentration, the amount of solvent, extraction temperature and extraction time were investigated based on a single-factor experiment.The effects of extraction yield of curcuminoids under different processing conditions were compared by HPLC method. Content of curcuminoids and antioxidant activity of the extract were used as comprehensive survey index. Free radical scavenging DPPH method was used to assess the antioxidant effect. And the extraction technique parameters were optimized. Results The condition of optimal extraction technique was ethanol concentration 60%, amount of solvent 20 folds, extraction time 2 h, extraction temperature 90 ℃. Under these conditions, the extraction yield of curcuminoids was 3. 65%. DPPH free radical scavenging yield of the curcumin extract was 79.79%. Conclusion This optimized technology is simple and have a good reappearing rate, and the extracts of Curcuma longa L.show good antioxidant activity.