Full
Outline
To explore a method for the selective separation and enrichment of protocatechuic acid (PCA) from actual samples of traditional Chinese medicinal materials, in this study, based on the boron affinity and molecular imprinting strategy, a specific imprinted magnetic material with high affinity for PCA was prepared by using Fe3O4 magnetic nanoparticles (Fe3O4 MNPs) as the substrate and amplifying the number of boronic acid ligands on the product surface with branched polyethylenimine (PEI). The prepared Fe3O4@PEI@FPBA MIPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and other instruments, and their adsorption performance was systematically investigated. Due to the boron affinity-directed surface imprinting mechanism, the prepared Fe3O4@PEI@FPBA MIPs showed high selectivity for PCA, with a maximum adsorption capacity of 475.33 mg·g-1 and a maximum imprinting factor (IF) of 5.24. The adsorption process conformed to the pseudo-first-order kinetic model, and the adsorption isotherm conformed to the Langmuir model. In addition, the results of the repeatability test also indicated that Fe3O4@PEI@FPBA MIPs could maintain good adsorption performance after repeated use. The recovery rate of the actual sample analysis was 96.67% to 110.17% (relative standard deviation was 1.65% to 4.52%).
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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