Abstract
Titania-grafted magnetic sporopollenin is synthesized by the liquid-phase deposition (LPD) technique, characterized by SEM, EDX, and nitrogen adsorption porosimetry, and used for the selective enrichment of phosphorylated peptides. The material is low cost because of easier availability of pollens and has rich surface chemistry which enables strong attachment of titania onto magnetic sporopollenin. The material shows higher selectivity of 1:1000 with β-casein spiked in BSA. Higher sensitivity of 10 fmol is recorded for phosphopeptides from standard β-casein digest. Twenty phosphorylated peptides are enriched from milk digest and four endogenous phosphopeptides from diluted human serum. The magnetic property of titania-coated magnetic sporopollenin facilitates the fast and effective isolation of phosphopeptides from complex mixtures through external magnet. The material is finally applied to tryptic digest of rat brain cell lysate for phosphopeptide enrichment where 2718 phosphopeptides are identified by using LC-MS/MS with C18 column. Titania-coated magnetic sporopollenin captures both mono-phosphorylated (2489) and multi-phosphorylated peptides (229) due to strong affinity of TiO2 with phosphates. TiO2-coated magnetic material also shows better enrichment efficiency in comparison to commercial TiO2.
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Acknowledgments
This work is supported by the Higher Education Commission (HEC) of Pakistan. The authors also thank the Key State Laboratory of Analytical Chemistry, Department of Chemistry, Wuhan University, Wuhan (430072), China, for their kind support during this work.
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Samples were collected from healthy volunteers and animal houses after taking their written consent and approval by the ethical committee of Zhongnan Hospital of Wuhan University and Hubei Provincial Centre for Disease Control and Prevention (Wuhan, China) and met the Declaration of Helsinki.
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Hussain, D., Najam-ul-Haq, M., Majeed, S. et al. Facile liquid-phase deposition synthesis of titania-coated magnetic sporopollenin for the selective capture of phosphopeptides. Anal Bioanal Chem 411, 3373–3382 (2019). https://doi.org/10.1007/s00216-019-01811-4
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DOI: https://doi.org/10.1007/s00216-019-01811-4