Abstract
A method for preparing a metal–organic framework (MOF)–polymeric monolith was established by in situ radical polymerization with derivatized UiO-66-2COOH and N-isopropylacrylamide (NIPAAm) as co-monomers. It was worth noting that the obtained monolith possessed characteristics of relatively uniform porous structure and a high surface area (84.16 m2 g−1). The adsorption capacity of the monolith increased from 22.87 to 44.92 mg−1 due to the addition of MOF. The monolith was used as adsorbent and coupled with HPLC for the online purification and extraction of ursolic acid (UA) in medicinal plant. The limit of detection (LOD, S/N = 3) and the limit of quantification (LOQ, S/N = 10) were 0.17 μg mL−1 and 0.57 μg mL−1, respectively; the relative standard deviation (RSD) of intra-day and inter-day assays for five plant samples were 1.00–3.67% and 2.43–5.76%, respectively; a good accuracy was demonstrated by the recovery of 92.2–103.28%. The results indicated that the MOF–polymer monolith was feasible for the online enrichment and purification of UA in plant.
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Acknowledgements
The work was supported by the National Natural Science Foundation of China (no. 21974034, 21575033, 21505030) and the Natural Science Foundation of Hebei Province (no. B2018201270).
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10337_2020_3931_MOESM4_ESM.tif
Supplementary file4 Fig. S4 Reaction equation and SEM images of MOF–polymer monolith (G) and poly (NIPAAm-co-EDMA) monolith (I) (TIF 4570 kb)
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Supplementary file5 Fig. S5 The effect of methanol concentration on the retention factor of six aromatic compounds. Mobile phase: methanol/water (different ratio); Detection wavelength: 254 nm; Flow rate: 1.0 mL/min (TIF 535 kb)
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Supplementary file6 Fig. S6 Separation of (a) neutral and (b) mixed samples with the MOF–polymer monolith. a: (1) benzene, (2) n-butylbenzene, (3) biphenyl, (4) anthracene; b: (1) catechol, (2) p-nitroaniline, (3) naphthalene; (4) diphenylamine, (5) anthracene (TIF 1044 kb)
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Supplementary file7 Fig. S7 The back pressure of silica gel-C18 column (5 µm, 10 mm×4.6 mm i.d.) (a) and MOF–polymer monolith (50 mm×4.6 mm i.d.) (b) in different mobile phase (TIF 245 kb)
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Pang, X., Liu, H., Yu, H. et al. Monolithic Column Prepared with UiO-66-2COOH MOF as Monomer for Enrichment and Purification of Ursolic Acid in Plants by Online Solid-Phase Extraction. Chromatographia 83, 1121–1131 (2020). https://doi.org/10.1007/s10337-020-03931-x
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DOI: https://doi.org/10.1007/s10337-020-03931-x