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Molecules 2018, 23(9), 2309;

Application of Ionic Liquid-Based Ultrasonic-Assisted Extraction of Flavonoids from Bamboo Leaves

Zhejiang Academy of Forestry, Hangzhou 310023, China
School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
Zhejiang Provincial Key Lab for Chemical and Biological Processing Technology of Farm Produces, Hangzhou 310023, China
Zhejiang Province Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacuring, Hangzhou 310023, China
Authors to whom correspondence should be addressed.
Received: 10 August 2018 / Revised: 4 September 2018 / Accepted: 6 September 2018 / Published: 10 September 2018
(This article belongs to the Special Issue Green and Sustainable Solvents)
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Ionic liquids (ILs), known as environmentally benign “green” solvents, were developed as an optimal solvent for the green extraction and separation field. In this paper, an ionic liquid-based ultrasonic-assisted extraction (IL-UAE) of flavonoids (FVs) from bamboo leaves of Phyllostachys heterocycla was developed for the first time. First, 1-butyl-3-methylimidazolium bromide ([Bmim] Br), with the best extraction efficiency, was selected from fifteen ionic liquids with diverse structure, like carbon chains or anions. Then, the influencing parameters of ionic liquid (IL) concentration, liquid-solid ratio, ultrasonic time, and ultrasonic power, were investigated by single factor tests, and further optimized using response surface methodology (RSM). In the optimization experiment, the best conditions were 1.5 mol/L [BMIM]Br aqueous solution, liquid-solid ratio 41 mL/g, ultrasonic time 90 min, and ultrasonic power 300 W. Furthermore, the microstructures of bamboo leaves and the recovery of FVs and [BMIM]Br were also studied. Therefore, this simple, green and effective IL-UAE method has potentiality for the extraction of FVs from bamboo leaves for the large-scale operations. View Full-Text
Keywords: Phyllostachys heterocycle; bamboo leaves; ionic liquid; ultrasonic-assisted extraction; flavonoids Phyllostachys heterocycle; bamboo leaves; ionic liquid; ultrasonic-assisted extraction; flavonoids

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Wang, L.; Bai, M.; Qin, Y.; Liu, B.; Wang, Y.; Zhou, Y. Application of Ionic Liquid-Based Ultrasonic-Assisted Extraction of Flavonoids from Bamboo Leaves. Molecules 2018, 23, 2309.

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