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Balance of xanthophylls molecular and protonated molecular ions in electrospray ionization

✍ Scribed by Thais Guaratini; Ricardo Vessecchi; Ernani Pinto; Pio Colepicolo; Norberto P. Lopes

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
158 KB
Volume
40
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

This paper reports the chemical evidence of the balance between radical molecular ions and protonatedmolecules of xanthophylls (an oxygen‐containing carotenoid) with a conjugated π‐system (polyene) and oxygen as a heteroatom in ESI and HRESI mass spectrometry. The ionization energy of neutral xanthophylls was calculated by semi‐empirical methods. The results were compared with those previously published for carotenoids and retinoids, which have also been shown in ESI‐MS to form M^+β€’^ and [M + H]^+^, respectively. This study demonstrates, for the first time, the correlation of an extended conjugation and the presence of oxygen in the formation and balance of M^+β€’^ or [M + H]^+^ for the carotenoids, neoxanthin, lutein, violaxanthin and zeaxanthin. Copyright Β© 2005 John Wiley & Sons, Ltd.

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