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Identification of Catechin Oligomers from Apple (Malus pumila cv. Fuji) in Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry and Fast-atom Bombardment Mass Spectrometry

✍ Scribed by Mayumi Ohnishi-Kameyama; Akio Yanagida; Tomomasa Kanda; Tadahiro Nagata

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
190 KB
Volume
11
Category
Article
ISSN
0951-4198

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✦ Synopsis

Molecular size information for polymerized catechin larger than the decamer in unripe apple was obtained by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and by fast-atom bombardment mass spectrometry. Matrix-assisted laser desorption/ionization time of flight mass spectrometry provided evidence for the pentadecamer using trans-3-indoleacrylic acid as the matrix in the presence of silver ion. Even in the absence of silver ion, the dodecamer and undecamer were observed in the positive-and negative-ion modes, respectively. Fast-atom bombardment mass spectrometry also afforded evidence for the undecamer in both positive-and negative-ion modes.

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