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. 2017 Oct 10;26(5):1313-1323.
doi: 10.1007/s10068-017-0112-4. eCollection 2017.

Optimization of ultrasound-assisted extraction of indigo and indirubin from Isatis indigotica Fort. and their antioxidant capacities

Guihong Zhao  1 , Tao Li  1 , Xinyun Qu  1 , Nini Zhang  1 , Miao Lu  1 , Jing Wang  1
Affiliations

Optimization of ultrasound-assisted extraction of indigo and indirubin from Isatis indigotica Fort. and their antioxidant capacities

Guihong Zhao et al. Food Sci Biotechnol. .

Abstract

An effective method for the ultrasound-assisted extraction of indigo and indirubin from Isatis indigotica Fort. was established and their antioxidant activities were investigated. Response surface methodology based on a three-level, four-factor Box-Behnken design was used to optimize the extraction conditions. Analysis of variance showed that the quadratic model was significant for the extraction of indigo and indirubin (112.72% ± 1.65% and 116.42% ± 1.27%, respectively) under the optimal conditions (methanol concentration, 80%; extraction time, 25 min; ratio of solid to liquid, 1:34 g/mL; and extraction temperature, 41 °C) and was in good agreement with the predicted value. Moreover, evaluation of the antioxidant activities suggested that indigo and indirubin presented better scavenging effects on 1,1-diphenyl-2-picrylhydrazyl free radical and superoxide radical than the extract and the extract revealed certain antioxidant activities in hydroxyl radical scavenging and reducing power, and indigo and indirubin could be used as natural antioxidants in the food or medicine industry.

Keywords: Antioxidant activity; Indigo; Indirubin; Isatis indigotica Fort.; Ultrasound-assisted extraction.

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Conflict of interest statement

Compliance with ethical standardsThe authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Response surface plots showing the effects of variables (X 1: methanol concentration,  %; X 2: extraction time, min; X 3: ratio of solid to liquid, g/mL; and X 4: extraction temperature;  °C) on the composite indicator
Fig. 2
Fig. 2
The scavenging activity of DPPH free radical (A), superoxide anion radical (B), hydroxyl radical (C), and the reducing power (D)
See this image and copyright information in PMC

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