In Situ Cascade Derivation toward a Hierarchical Layered Double Hydroxide Magnetic Absorbent for High-Performance Protein Separation
Shuo Shi, Wentao Zhang, Haofen Wu, Yuchen Li, Xinyi Ren, Min Li, Jie Liu, Jing Sun, Tianli Yue, Jianlong Wang
Abstract
Selective enrichment and purification of histidine (His)-rich protein from complex mixtures is vital to satisfy the requirements of proteomic and diagnostic applications, but it still remain a challenge. Herein, a high-performance layered double hydroxide (LDH)-based adsorbent is designed and prepared, via a metal–organic framework (MOF)-mediated in situ cascade derivation strategy, for enhanced His-rich protein separation. Importantly, the pseudomorphic conversion of Fe3O4 nanoparticle-derived magnetic MIL-100(Fe) MOF, with unique structural features, enables the finally derived LDH with plenty of Ni2+ ions exposed for His-rich protein binding. As such, the as-prepared Fe3O4@NiFe LDH exhibits favorable selectivity for His-rich protein adsorption with bovine hemoglobin (BHb) as a model and with a relatively high binding capacity of 3287.67 mg g–1 in a rapid equilibrium time of 20 min, which is superior to those reported magnetic adsorbents. Also, the high performance of Fe3O4@NiFe LDH can be facilely regenerated and applied to separate BHb from a bovine blood sample, highlighting its good practicality. Therefore, this MOF-mediated cascade derivation strategy is a promising way to design advanced layered double hydroxide magnetic adsorbents for high-performance bioseparation.