Response surface methodology was used to optimize ultrasonic-assisted extraction of total flavonoids from Artemisia lactiflora Wall. ex DC. with a Box-Behnken design. The results indicated that the experimental yield of 6.396 ± 0.013 % was in good agreement with the value predicted by the model at the optimum extraction condition of ethanol concentration 53.5 % (v/v), liquid-to-solid ratio 22.95:1 (mL/g) and extraction time 23.2 min. The antioxidant activities of the purified extract were evaluated in vitro by 2,2-diphenyl-1-picrylhydrazyl, 2,2'-azino-bis(3-ethyl benzothiazoline-6- sulphonic acid) diammonium salt, ferric reducing antioxidant power and ferrous ion-chelating ability assays. In addition, nine flavonoids were isolated from A. lactiflora. for the first time. Among them, quercetin (compound 5) had the highest 2,2-diphenyl-1-picrylhydrazyl radical-scavenging activity with an IC50 of 7.6 ± 0.3 mu;M, indicating an important role of 5 for the antioxidant activity of A. lactiflora. The results showed that the flavonoids in this plant can be used as a source of potential antioxidants.
CITATION STYLE
Xiao, M., Ye, J., Huang, Y., & Zhang, X. (2014). Response surface optimization for extraction of flavonoids from artemisia lactiflora wall. ex dc. and evaluation of antioxidant capacities in vitro. Asian Journal of Chemistry, 26(9), 2802–2808. https://doi.org/10.14233/ajchem.2014.16962
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