JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (5): 129-137.doi: 10.12302/j.issn.1000-2006.202205009

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Extraction technology and antioxidant activity analyses of total polyphenols from Xanthoceras sorbifolia leaves

SU Jinghan1(), WANG Gaiping1,*(), LIU Yuhua2, QI Ya1, PENG Daqing3, LI Shouke4, CAO Fuliang1   

  1. 1. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
    2. Jiangsu Vocational and Technical College of Agriculture and Forestry, Jurong 212400, China
    3. Jiangsu Yancheng Forest Farm, Yancheng 224057, China
    4. Shandong Woqi Agricultural Development Co., Ltd., Weifang 262106, China
  • Received:2022-05-07 Revised:2022-09-26 Online:2023-09-30 Published:2023-10-10

Abstract:

【Objective】This research aims to explore the best extraction process of total polyphenols from Xanthoceras sorbifolia leaves, compare the content and antioxidant activity of total polyphenols from different sources, and provide a reference for the development and utilization of X. sorbifolia leaves. 【Method】The total polyphenols of X. sorbifolia leaves from 15 sources were extracted by ultrasonic assisted response surface method, and the content of total polyphenols in X. sorbifolia leaves was determined by Folin-iocaileu colorimetry. The antioxidant capacity of X. sorbifolia leaves was evaluated by measuring the scavenging power of total polyphenols on the DPPH free radical and the antioxidant capacity of FRAP method. 【Result】Through single factor experiments, the optimum extraction process of total polyphenols from X. sorbifolia leaves was obtained with ethanol concentration 70%, solid-liquid ratio 1∶30 g/mL and extraction temperature 60 ℃. The extraction rate of total polyphenols from X. sorbifolia leaves was optimized according to Box-Behnken response surface method. The optimum extraction conditions were as follows: ethanol concentration 60%, solid-liquid ratio 1∶30 g/mL, extraction time 43 min and extraction temperature 70 ℃. The average content of total polyphenols in 15 sources was 36.34 mg/g, of which the content of total polyphenols in X. sorbifolia leaves in Yinchuan, Ningxia was the highest, 42.37 mg/g. The antioxidant capacity of total polyphenols in X. sorbifolia leaves from different sources was different. The DPPH free radical scavenging rate of total polyphenols in X. sorbifolia leaves from 15 sources ranged from 64.33% to 92.65%, and the DPPH free radical scavenging rate of Yinchuan provenance in Ningxia was the highest, 92.65%. The total antioxidant capacity of total polyphenols in X. sorbifolia leaves from 15 sources ranged from 0.71 to 1.53 mol/g, and the total antioxidant capacity from Ledu provenance in Qinghai was the strongest, 1.53 mol/g. The APC index of Ledu is the highest, 99.73%; Xinjiang Changji has the lowest APC index, only 62.86%.The content of total polyphenols in X. sorbifolia leaves was positively correlated with the antioxidant capacity of its extract. 【Conclusion】The optimum extraction conditions of total polyphenols from X. sorbifolia leaves were ethanol concentration 60%, solid-liquid ratio 1∶30 g/mL, extraction time 43 min and extraction temperature 70 ℃. The total polyphenol contents of X. sorbifolia leaves from Yinchuan in Ningxia and Ledu in Qinghai are high and the antioxidant capacity are strong.

Key words: Xanthoceras sorbifolia, total polyphenols, antioxidant activity, response surface, ultrasonic

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