Abstract
An environment-friendly method for the fabrication of silica microspheres with tunable pore sizes and narrow particle size distribution was reported through the procedure of twice alkali-thermal reaction, deposition, and calcination. Porous mercaptopropyl-functionalized polysilsesquioxane (Mp-P) microspheres were used as hard templates, the pore size of the Mp-P microspheres can be enlarged by adjusting the reaction pH of the secondary alkali treatment. After modification of the allyl quaternary amine group by the “thiol-ene” click reaction, the mechanical strength of the microspheres can be improved through the electrostatically induced deposition of tetraethyl orthosilicate prepolymer (PES). The effects of the surface charge of template microspheres and the amount of PES deposition on pore structure and mechanical strength of the microspheres were investigated. After calcination, silica microspheres with different pore sizes can be obtained. Propyltrimethoxysilane was bound to the microspheres and used directly as chromatographic stationary phases without classification. The performance of the columns with different pore sizes was evaluated and compared in terms of retention factor, reduced plate height, and resolution for the separation of the protein mixture composed of ribonuclease A, insulin, cytochrome C, and bovine serum albumin. The results showed that the propyl column with a pore size of 18 nm was suitable for the separation of proteins with molecular weights up to 70 kDa, with high column efficiency and resolution.
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Acknowledgements
We thank Dr. Xing-Hua Jin and Yan Gao from the Analytical Center of the School of Pharmaceutical Science & Technology for their assistance in the measure of elemental analysis and zeta potential.
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YJ: investigation, analysis, data curation and writing the original draft. XG: silica microsphere synthesis conditions optimization. CQ: basic tests on columns. LC: supervision, resources, project administration, review and edit of the manuscript.
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Jing, Y., Guo, X., Qi, C. et al. Fabrication of Silica Microspheres for HPLC Packing with Narrow Particle Size Distribution and Different Pore Sizes by Hard Template Method for Protein Separation. Chromatographia 85, 985–995 (2022). https://doi.org/10.1007/s10337-022-04200-9
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DOI: https://doi.org/10.1007/s10337-022-04200-9