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Target-Guided Isolation of Three Main Antioxidants from Mahonia bealei (Fort.) Carr. Leaves Using HSCCC

Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental protection/Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake, Huaiyin Normal University, Huaian 223300, China
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Authors to whom correspondence should be addressed.
These authors equally contributed to this work.
Academic Editors: Susana M. Cardoso and Alessia Fazio
Molecules 2019, 24(10), 1907; https://doi.org/10.3390/molecules24101907 (registering DOI)
Received: 1 May 2019 / Revised: 14 May 2019 / Accepted: 15 May 2019 / Published: 17 May 2019
(This article belongs to the Special Issue The Antioxidant Capacities of Natural Products 2019)
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Abstract

Mahonia bealei (Fort.) Carr. is an economically important plant that is widely cultivated in Southwest China. Its leaves are commonly used for tea and contain an abundance of antioxidant compounds. However, methods of the systematic purification of antioxidants from M. bealei are lacking. In this study, antioxidants from this plant were effectively and rapidly enriched. First, antioxidants were screened using online 1,1-diphenyl-2-picryl-hydrazyl radical (DPPH)–high performance liquid chromatography (HPLC), followed by separation using high-speed countercurrent chromatography with an optical solvent system composed of n-hexane/ethyl acetate/methanol/water (1:5:1:5, v/v/v/v). Three phenolics—chlorogenic acid (1, 8.3 mg), quercetin-3-O-β-d-glucopyranoside (2, 20.5 mg), and isorhamnetin-3-O-β-d-glucopyranoside (3, 28.4 mg)—were obtained from the ethyl acetate-soluble fraction (240 mg) by one-step separation. The chemical structures of the phenolics were characterized by MS and NMR techniques, and the purity of each compound was >92.0% as determined by HPLC. The isolated compounds were assessed by scavenging activities on DPPH and superoxide radicals as well as cytoprotective assays, all of which showed similar trends regarding the antioxidant capacities of the compounds. Moreover, compounds 13 significantly attenuated the lipid peroxidation and antioxidant enzyme activities in H2O2-treated RAW264.7 cells. Our study demonstrated the efficiency of a newly developed integrative system for the comprehensive characterization of pure compounds from M. bealei, which will allow their use as reference substances. View Full-Text
Keywords: Mahonia bealei (Fort.) Carr.; DPPH–HPLC; HSCCC; antioxidant activity Mahonia bealei (Fort.) Carr.; DPPH–HPLC; HSCCC; antioxidant activity
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Hu, W.; Zhou, J.; Shen, T.; Wang, X. Target-Guided Isolation of Three Main Antioxidants from Mahonia bealei (Fort.) Carr. Leaves Using HSCCC. Molecules 2019, 24, 1907.

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