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Electrospray mass spectrometry and UV/visible spectrophotometry studies of aluminum(III)–flavonoid complexes

✍ Scribed by Haiteng Deng; Gary J. Van Berkel

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
166 KB
Volume
33
Category
Article
ISSN
1076-5174

No coin nor oath required. For personal study only.

✦ Synopsis

Aluminum(III) complexes formed by the isoÑavone biochanin-A and the Ñavones kaempeferol and quercetin in and the mixed solvents

(1/1 v/v), were investigated by means of electrospray mass CH

OH spectrometry (ES-MS) and UV/visible absorbance spectrophotometry. Electrospray mass spectra of solutions that were indicated by their UV/visible spectra to have formed an Al-Ñavonoid complex displayed singly-charged ions corresponding in m/z to the 1 : 2, dimeric complex, viz., L = (Ñavonoid Ô H')-. Lesser abundant singly-[ AlL 2 ] ', charged ions corresponding in m/z to [ AlR(L) ] ', where R = H-, HO-or were also sometimes observed. CH 3 O-Formation of the 1 : 2 complex was favored in relative to all other solvent systems investigated. The CH 3 OH relative amounts of complexed and free Ñavonoid in solution, as estimated by the appearance of the UV/visible spectra, correlated well with the abundance ratio of the 1 : 2, Al-Ñavonoid dimer to the protonated Ñavonoid (indicative of free Ñavonoid) observed in the ES mass spectrum of the same solution.

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