Unit Mass Baseline Resolution for an Intact 148 kDa Therapeutic Monoclonal Antibody by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

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• 作者：Santosh G. Valeja ; Nathan K. Kaiser ; Feng Xian ; Christopher L. Hendrickson ; Jason C. Rouse ; Alan G. Marshall
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：November 15, 2011
• 年：2011
• 卷：83
• 期：22
• 页码：8391-8395
• 全文大小：876K
• 年卷期：v.83,no.22(November 15, 2011)
• ISSN：1520-6882

文摘

Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS) provides the highest mass resolving power and mass measurement accuracy for unambiguous identification of biomolecules. Previously, the highest-mass protein for which FTICR unit mass resolution had been obtained was 115 kDa at 7 T. Here, we present baseline resolution for an intact 147.7 kDa monoclonal antibody (mAb), by prior dissociation of noncovalent adducts, optimization of detected total ion number, and optimization of ICR cell parameters to minimize space charge shifts, peak coalescence, and destructive ion cloud Coulombic interactions. The resultant long ICR transient lifetime (as high as 20 s) results in magnitude-mode mass resolving power of 420鈥?00 at m/z 2鈥?93 for the 57+ charge state (the highest mass for which baseline unit mass resolution has been achieved), auguring for future characterization of even larger intact proteins and protein complexes by FTICR MS. We also demonstrate up to 80% higher resolving power by phase correction to yield an absorption-mode mass spectrum.