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Patil AA, Liu ZX, Chiu YP, Lại TKL, Chou SW, Cheng CY, Su WM, Liao HT, Agcaoili JBA, Peng WP. Development of a linear ion trap mass spectrometer capable of analyzing megadalton MALDI ions. Talanta 2023; 259:124555. [PMID: 37088041 DOI: 10.1016/j.talanta.2023.124555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 04/02/2023] [Accepted: 04/11/2023] [Indexed: 04/25/2023]
Abstract
Detecting megadalton matrix-assisted laser desorption/ionization (MALDI) ions in an ion trap mass spectrometer is a technical challenge. In this study, megadalton protein and polymer ions were successfully measured by MALDI linear ion trap mass spectrometer (LIT-MS) for the first time. The LIT-MS is comprised of a Thermo linear ion trap mass analyzer and a highly sensitive charge-sensing particle detector (CSPD). A newly designed radio frequency (rf) scan mode with dipolar resonance ejection techniques is proposed to extend the mass range of LIT-MS up to one million Thomson (Th). We analyze high mass ions with mass-to charge (m/z) ratios ranging from 100 kTh to 1 MTh, including thyroglobulin, alpha-2-macroglobulin, immunoglobulins (e.g., IgG and IgM), and polymer (∼ 940 kTh) ions. Besides, it is also very challenging for ion trap mass spectrometry to detect megadalton ions at low concentrations. By adopting high affinity carboxylated/oxidized detonation nanodiamonds (oxDNDs) to enrich IgM molecules and form antibody-nanodiamond conjugates, we have successfully reached ∼ 5 nM (5 μg/mL) concentration which is better than that by the other techniques.
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Affiliation(s)
- Avinash A Patil
- Department of Physics, National Dong Hwa University, Shoufeng, Hualien, 97401, Taiwan
| | - Zhe-Xuan Liu
- Department of Physics, National Dong Hwa University, Shoufeng, Hualien, 97401, Taiwan
| | - Yi-Pang Chiu
- Department of Physics, National Dong Hwa University, Shoufeng, Hualien, 97401, Taiwan
| | - Thị Khánh Ly Lại
- Department of Physics, National Dong Hwa University, Shoufeng, Hualien, 97401, Taiwan
| | - Szu-Wei Chou
- AcroMass Technologies Inc., Hukou, Hsinchu, 30352, Taiwan
| | - Chun-Yen Cheng
- AcroMass Technologies Inc., Hukou, Hsinchu, 30352, Taiwan
| | - Wen-Min Su
- Department of Life Science, National Dong Hwa University, Hualien, 97401, Taiwan
| | - Hong-Ting Liao
- Department of Life Science, National Dong Hwa University, Hualien, 97401, Taiwan
| | | | - Wen-Ping Peng
- Department of Physics, National Dong Hwa University, Shoufeng, Hualien, 97401, Taiwan.
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