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High-Resolution Mass Spectrometry (HRMS)01:15

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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    Area of Science:

    • Biophysics
    • Biochemistry
    • Analytical Chemistry

    Background:

    • Nuclear Magnetic Resonance (NMR) spectroscopy is vital in physical and life sciences.
    • Ultra-high field (UHF) NMR offers superior sensitivity and resolution, particularly for solid-state NMR (SSNMR) of large molecules.
    • SSNMR resolution is typically limited by instrumentation, unlike solution NMR's reliance on molecular tumbling.

    Purpose of the Study:

    • To overcome linebroadening challenges in GHz-class magic-angle-spinning SSNMR.
    • To enable high-resolution structural analysis of large, high molecular weight proteins.
    • To advance the capabilities of UHF NMR for life science research.

    Main Methods:

    • Utilized an external deuterium (2H) lock to actively compensate for magnetic field drift.
    • Implemented Long-Observation-Window Band-Selective Homonuclear Decoupling (LOW-BASHD) to suppress 13C homonuclear couplings.
    • Applied these techniques to magic-angle-spinning SSNMR experiments on large protein systems.

    Main Results:

    • Achieved spectral resolution better than 0.2 ppm for proteins up to 144 kDa.
    • Enabled site resolution for over 500 amide backbone pairs in 2D experiments.
    • Demonstrated resolution surpassing that of solution NMR for large biomolecules.

    Conclusions:

    • The developed methods significantly enhance the resolution achievable with GHz-class NMR.
    • This breakthrough expands the potential of SSNMR for detailed structural studies of large biological macromolecules.
    • High-resolution SSNMR at ultra-high fields opens new avenues in life sciences research.