Optimization of Ultrasound-Assisted Extraction of Natural Antioxidants from the Osmanthus fragrans Flower

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
An-Na LiHua-Bin Li

Abstract

An ultrasound-assisted extraction (UAE) method was developed to extract natural antioxidants from the Osmanthus fragrans flower. The effect of UAE on antioxidant activity of the extract from the Osmanthus fragrans flower was studied using a Trolox equivalent antioxidant capacity (TEAC) assay. Optimization conditions were firstly determined using a single-factor experiment, and response surface methodology was then used to evaluate interaction of several experimental parameters. Analysis of the coefficient of determination showed that second-order polynomial models produced a highly satisfactory fitting of the experimental data with regard to TEAC values (R² = 0.9829, p < 0.0001). The optimal conditions were 39.1% ethanol, and extraction for 35.2 min at 59.4 °C. Under these conditions, the maximum TEAC value was 584.9 ± 6.0 μmol Trolox/g DW, which was higher than those obtained by the conventional extracting method (486.4 ± 12.6 μmol Trolox/g DW) and the Soxhlet extraction method (339.1 ± 16.2 μmol Trolox/g DW). The crude extract obtained could be used either as a food additive or in pharmaceuticals for the prevention and treatment of diseases caused by oxidative stress.

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Citations

Apr 20, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yue ZhouHua-Bin Li
Sep 8, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ya LiHua-Bin Li
May 5, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jiao-Jiao ZhangHua-Bin Li
Dec 14, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yongmei JiangGang Wang

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