4.7 Article

Solvent effect on phenolics and antioxidant activity of Huangshan Gongju (Dendranthema morifolium (Ramat) Tzvel. cv. Gongju) extract

Journal

FOOD AND CHEMICAL TOXICOLOGY
Volume 147, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fct.2020.111875

Keywords

Chrysanthemum; Solvent effect; Phenolic compound; Antioxidant activity

Funding

  1. Fundamental Research Funds for the Central Universities [JZ2019HGTB0061]
  2. Science and Technology Projects of Anhui Province [18030701144, 17030701058]
  3. Natural Science Foundation of Anhui Province [2008085MC88]
  4. National Natural Science Foundation of China [31671266]

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The study found that using high content organic solvents (50-70%) can obtain Huangshan Gongju extracts with higher phenolic content and antioxidant activity, with 70% ethanol being a promising solvent. Phenolics were identified as the main antioxidants in Huangshan Gongju extracts, and flavonoids, especially luteolin-7-O-glucoside, may play more important roles in antioxidant activity.
Huangshan Gongju was extracted with organic solvents (ethanol, methanol and acetone) of different concentrations (0-90%), and the extracts' phenolic content and antioxidant activity, as well as the correlations between them were examined. With the increasing concentration of organic solvent, the total phenolic compound (TPC) increased continuously and met its maximum at 70% acetone, whereas the total flavonoid compound (TFC) and most individual phenolics met their maximums at 70% ethanol. Similar changes occurred to the antioxidant activity, including DPPH and ABTS scavenging activities, and their maximums were respectively found at 50% acetone and 70% ethanol. The antioxidant activity correlated strongly with TPC/TFC (r > 0.954, p < 0.01) and individual phenolics (r > 0.886, p < 0.05), and the strongest correlations between them were mainly given by luteolin-7-O-glucoside (r > 0.975, p < 0.001). These results suggested that high content organic solvent (50-70%) was beneficial to obtain Huangshan Gongju extracts of higher phenolic content and antioxidant activity, and 70% ethanol may be the promising solvent. Besides, phenolics were found to be the main antioxidants of Huangshan Gongju extracts, and flavonoids especially luteolin-7-O-glucoside may play more important roles in the antioxidant activity.

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