[ 48 ] that the relative ion intensities of α-CD and β-CD associates with Na + , K + , and Cs + (not H + ) in MALDI MS were much higher that of corresponding ionized maltohexaose and maltoheptaose, respectively; differences showed an increasing trend with the radii of metal cations, and β-CD had higher ionization efficiency than α-CD.
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Gas-Phase Fragmentation of Cyclic Oligosaccharides in Tandem Mass Spectrometry.
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