1956
DOI: 10.1021/jo01118a018
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Absorption Spectra of Metal Complexes of Flavonoid Compounds

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Cited by 131 publications
(72 citation statements)
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“…The formation of Fe3 +-phenol complexes that yield absorption spectra in the visible region is well documented (Wesp and Brode 1934;Jurd and Geissman 1956;Brune et al 1991) and the complex is more stable as the polyphenols are oxidised (DaDamio and Thompson 1992). The cation may also bind to other organic compounds in the fruits such as the cell wall polymers (Platt and Clydesdale 1987).…”
Section: Introductionmentioning
confidence: 95%
“…The formation of Fe3 +-phenol complexes that yield absorption spectra in the visible region is well documented (Wesp and Brode 1934;Jurd and Geissman 1956;Brune et al 1991) and the complex is more stable as the polyphenols are oxidised (DaDamio and Thompson 1992). The cation may also bind to other organic compounds in the fruits such as the cell wall polymers (Platt and Clydesdale 1987).…”
Section: Introductionmentioning
confidence: 95%
“…Because of interference by other, nonflavonoid compounds in this spectral region, these compounds could not be quantitated directly in plant extracts. The visible absorption maximum of flavonol glycosides in alcoholic solutions is known to undergo a bathochromic shift in the presence of AlCl3 (13). This property of the compounds has been used in the past as one of the criteria in their structural identification.…”
Section: Discussionmentioning
confidence: 99%
“…The quantification of flavonoids was determined as previously described (Jurd & Geissman, 1956).The values were expressed as mg of quercetin equivalent per gram of freeze-dried peel. The determination of ascorbic acid was performed as described (Benassi & Antunes, 1988).…”
Section: Determination Of Flavonoids and Ascorbic Acidmentioning
confidence: 99%