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Chemistry and Industry of Forest Products ›› 2022, Vol. 42 ›› Issue (1): 101-109.doi: 10.3969/j.issn.0253-2417.2022.01.014

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Extraction of Chlorogenic Acid From Eucommia ulmoides Leaves by Natural Deep Eutectic Solvent and Its Antioxidant Activity

Feng YU1,2(), Zhihong WANG1, Guangyao ZHANG1,2, Zhiyun DU2, Mijun PENG1,*()   

  1. 1. Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Institute of Analysis, Guangdong Academy of Sciences(China National Analytical Center, Guangzhou), Guangdong Academy of Sciences, Guangzhou 510070, China
    2. School of Biomedicine and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou 510070, China
  • Received:2020-12-02 Online:2022-02-28 Published:2022-03-11
  • Contact: Mijun PENG E-mail:fengyufred@163.com;pengmj163@163.com

Abstract:

Chlorogenic acid was extracted from Eucommia ulmoides leaves by natural deep eutectic solvent (NADES) with ultrasonic assistance.Its antioxidant activity was investigated.Firstly, the better natural deep eutectic solvent system was screened, and then based on the single factor test, the extraction process was optimized through the response surface and the antioxidant activity of chlorogenic acid from E.ulmoides leaves was investigated.The results showed that the better solvent system was composed of betaine, L-lactic acid and water, and the ratio of each component was 1:1:4, and water consumption in eutectic solvent was 5 mol.The optimum conditions for E.ulmoides chlorogenic acid extract were liquid-to-material ratio of 30:1(mL: g), extraction temperature 40℃, extraction time 42 min, ultrasonic power 340 W.Under these conditions, the yield of chlorogenic acid was 31.46 mg/g, which increased by 18.23% and 14.82% respectively compared with the extraction solvent of water (26.61 mg/g) or 60% ethanol (27.40 mg/g).The antioxidant activity of chlorogenic acid extract from E.ulmoides leaves was studied in vitro.The results showed that the NADES extract had strong scavenging ability to DPPH·, ABTS·, and·OH, with IC50 of 75.16, 19.98 and 314.20 mg/L, respectively.Its antioxidant capacity was stronger than those of water extract and alcohol extract, but slightly lower than that of Vc.

Key words: Eucommia ulmoides leaves, chlorogenic acid, natural deep eutectic solvents, response surface, antioxidant

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