Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (2): 20220511.doi: 10.7503/cjcu20220511

• Physical Chemistry • Previous Articles     Next Articles

Law and Mechanism of Enrichment of Baicalin in Scutellaria baicalensis by Cu-NIC-TMED

GUO Wenjuan1,2(), ZHANG Ying1,2, YU Jie1, DAI Zhao1,2, HOU Weizhao1   

  1. 1.Tianjin Key Laboratory of Green Chemical Technology and Processes Engineering,School of Chemical Engineering and Technology,Tiangong University
    2.State Key Laboratory of Separation Membranes and Membrane Processes,Tianjin 300387,China
  • Received:2022-08-01 Online:2023-02-10 Published:2022-10-06
  • Contact: GUO Wenjuan E-mail:guowenjuan@tiangong.edu.cn
  • Supported by:
    the Tianjin Municipal Education Commission Scientific Research Program, China(2019KJ010)

Abstract:

In this paper, nicotinic acid was used as the ligand to prepare copper nicotinate coordination polymer, and the metal organic framework(MOFs) material was used for the adsorption, separation and purification of baicalin in Scutellaria baicalensis, and a non-toxic, environmentally friendly, simple process, and efficient extraction method was obtained. In this experiment, the copper nicotinate coordination polymer Cu-NIC-TMED was synthesized by solvothermal method, and then its structure was characterized for proper coordination and accurately synthesized. The law and mechanism of the adsorption of baicalin by Cu-NIC-TMED were studied: the adsorption conformed to the Quasi-secondary kinetic equations, and the equilibrium adsorption data conformed to the Langmuir adsorption isothermal model. At the same time, the optimal adsorption parameters were obtained by optimizing the response surface(RSM). Under the condition of obtaining the optimal adsorption parameters, the adsorption rate of Cu-NIC-TMED on baicalin in S. baicalensis was as high as 84.08%, and the adsorption effect on other ingredients in S. baicalensis was minimal. Using pH=6.8 phosphate buffered saline(PBS) as the desorption solution, the ratio of Cu-NIC-TMED desorbed baicalin was 41.24%, and the purity of baicalin was increased from 21.55% before adsorption to 75.77% after desorption, Cu-NIC-TMED had good stability before and after adsorption, and the recovery rate reached 78.64%. Therefore, Cu-NIC-TMED has application value in the adsorption and purification of baicalin.

Key words: Metal organic framework, Copper nicotinate coordination polymer, Baicalin, Niacin

CLC Number: 

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