Observation of Na(+)-bound oligomers of quercetin in the gas phase

Autor:	T R, Croley, R J, Hughes, C, Hao, C D, Metcalfe, R E, March
Rok vydání:	2000
Předmět:	Ions Macromolecular Substances Sodium Quercetin Gases Mass Spectrometry
Zdroj:	Rapid communications in mass spectrometry : RCM. 14(23)
ISSN:	0951-4198
Popis:	While developing a liquid chromatography/tandem mass spectrometry method for the analysis of the flavonoid quercitin, it was observed that quercetin (3,3',4',5,7-pentahydroxyflavone) exhibited clustering in both the positive and negative ion mode. Two series of positive ion clusters were observed; the first series corresponds to singly charged [2M + Na](+) at m/z 627.2 to [13M + Na](+) at m/z 3947.5, while the second series corresponds to doubly charged [7M + 2Na](2+) at m/z 1080.4 to [25M + 2Na](2+) at m/z 3798.5. In the negative ion mode, the behavior of quercetin parallels that of apigenin (4',5,7-trihydroxyflavone) in that [M + NO(3)](-), [2M + NO(3)](-), and [3M + NO(3)](-) were observed at m/z 364.1, 666.0, and 968.9, respectively; in addition, quercitin clusters with chloride ions ([2M + Cl](-) at m/z 638.9 and [3M + Cl](-) at m/z 940. 9) were observed. The results of tandem mass spectrometric examination of several cluster ions are reported.
Databáze:	OpenAIRE
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