A neutral Cu-based MOF for effective quercetin extraction and conversion from natural onion juice

Rui-Qi Xiang; Yan-Fei Niu; Jie Han; Yat-Long Lau; Hai-Hong Wu; Xiao-Li Zhao

doi:10.1039/c9ra04551a

A neutral Cu-based MOF for effective quercetin extraction and conversion from natural onion juice

RSC Adv. 2019 Oct 21;9(58):33716-33721. doi: 10.1039/c9ra04551a. eCollection 2019 Oct 18.

Authors

Rui-Qi Xiang¹, Yan-Fei Niu¹, Jie Han², Yat-Long Lau², Hai-Hong Wu¹, Xiao-Li Zhao¹

Affiliations

¹ Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University 3663 North Zhongshan Road Shanghai 200062 P. R. China xlzhao@chem.ecnu.edu.cn +86-21-62233179.
² School of Science & Technology, The Open University of Hong Kong Kowloon Hong Kong SAR P. R. China.

Abstract

We report herein a new microporous neutral three-dimensional (3D) metal-organic framework [Cu₂(L)(DMF)(H₂O)]·guest (1·guest) composed of copper paddle-wheel and flexible tetracarboxylic acid linkers (DMF = N,N-dimethylformamide, H₄L = tetrakis[(6-carboxynaphthoxy)methyl]methane). Surprisingly, this MOF with neutral cavities can not only extract pure quercetin (QT) but also convert it into Cu-QT during the desorption process. It has been well characterized by UV-vis, IR, ESI-MS and TEM-EDS studies. Moreover, it can efficiently extract natural product QT from fresh QT-rich onion juice and rapidly convert it into Cu-QT with a relatively high conversion rate.