3 Result(s)
within
Young-Sik Shin
Chemistry
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Article
Degree of Ionization in MALDI of Peptides: Thermal Explanation for the Gas-Phase Ion Formation
Degree of ionization (DI) in matrix-assisted laser desorption ionization (MALDI) was measured for five peptides using α-cyano-4-hydroxycinnanmic acid (CHCA) as the matrix. DIs were low 10−4 for peptides and 10−7 ...
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Article
Ion Yields for Some Salts in MALDI: Mechanism for the Gas-Phase Ion Formation from Preformed Ions
Preformed ion emission is the main assumption in one of the prevailing theories for peptide and protein ion formation in matrix-assisted laser desorption ionization (MALDI). Since salts are in preformed ion fo...
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Article
Observation of phosphorylation site-specific dissociation of singly protonated phosphopeptides
In ultraviolet photodissociation of phosphopeptide ions with a basic residue (arginine, lysine, or histidine) at the N-terminus, intense an − 97 peaks were observed. These ions were formed by cleavage at phosphor...
