Fluorescence enhancement method for palmatine extraction by SWMONTs

Abstract

Single-walled metal-organic nanotubes (SWMONTs) could be dried in vacuum to obtain SWMONTs with activation sites. Glycine and diethylenetriamine (2,3-NH₂) were added to activated SWMONTs, and SWMONTs-COOH and SWMONTs-NH₂ nanoparticles could be obtained. SWMONTs-NH₂ nanoparticles could be covalently modified by single-ended and double-ended carboxyl polyethylene glycol (PEG-CM, CM-PEG-CM), and SWMONTs-PEG and SWMONTs-PEG-COOH nanoparticles could be obtained. The structure of SWMONTs-NH₂, SWMONTs-COOH, SWMONTs-PEG and SWMONTs-PEG-COOH nanoparticles could be determined by XPS (X-ray photoelectron spectroscopy). The results showed that the amidation reactions were successful. Palmatine (Pal) extraction experiments exhibited that, as for SWMONTs-COOH, SWMONTs-PEG and SWMONTs-PEG-COOH nanoparticles, the best adsorption could be obtained at pH 8, pH 10 and pH 12, which showed that palmatine has a better adsorption effect in an alkaline environment.

Graphical Abstract

Keywords:

• SWMONTs
• modification
• adsorption

Additional information

Funding

This work was supported by Outstanding Research Achievement Award Project of Tianjin Agricultural University, the Open Topic of Guangxi Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (CMEMR2016-B12), the National Natural Science Foundation of China (No. 21875117, No. 31572492), the Veterinary Biotechnology Scientific Research Innovation Team of Tianjin, China (Grant No. TD12-5019), the Veterinary “Innovative Talent People of Young and Middle Age Key Members Project” of Tianjin and the Natural Science Foundation of Tianjin (18JCYBJC30100).