期刊
TALANTA
卷 233, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.talanta.2021.122580
关键词
Miniature mass spectrometer; Linear ion trap; Native protein; Protein conformation
资金
- National Key Research and Development Program of China [2020YFF01014502]
- NNSFC [21922401, 21827810, 61635003]
A miniature protein mass spectrometer was developed for rapid identification of proteins and their conformations, with high mass resolution and sensitivity. Coupling the instrument with a soft electrospray ionization source allowed the acquisition of mass spectra of native proteins.
Current miniature mass spectrometers were usually designed for the detection of small and medium size molecules, including volatile (semi-volatile) compounds, drugs and lipids. In this study, a miniature protein mass spectrometer was developed in this work, which could serve as a biosensor for the rapid identification of proteins as well as their conformations. A linear ion trap with a field radius of 2.5 mm was designed to extend mass range of the instrument to over 6500 Th. Mass resolution and sensitivity of the instrument were also optimized for protein ions by increasing the buffer gas pressure and using a high-gain Faraday detector. It is then demonstrated that the mass spectra of native proteins, such as IgG1, could be acquired by coupling the instrument with a soft electrospray ionization source. As a proof-of-concept demonstration, results suggest that the current instrument could be used to identify target proteins and probe/distinguish their conformations in solutions.
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