2008
DOI: 10.1016/j.saa.2007.03.038
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Investigation of complexes tannic acid and myricetin with Fe(III)

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Cited by 83 publications
(75 citation statements)
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“…3). In particular, tannins containing pyrogallol units readily form complexes with FeCl 3 (Sungur and Uzar, 2008), and condensed tannins containing pyrogallol groups have been identified in pine previously (Ku and Mun, 2007). The presence of increased levels of flavonoids or flavonoid derivatives in transgenic pine plants would not be surprising, since elevated flavonoid production is quite common when silencing genes early in the monolignol pathway Besseau et al, 2007).…”
Section: Compositional and Structural Changes In Lignin Of 4cl Transgmentioning
confidence: 99%
“…3). In particular, tannins containing pyrogallol units readily form complexes with FeCl 3 (Sungur and Uzar, 2008), and condensed tannins containing pyrogallol groups have been identified in pine previously (Ku and Mun, 2007). The presence of increased levels of flavonoids or flavonoid derivatives in transgenic pine plants would not be surprising, since elevated flavonoid production is quite common when silencing genes early in the monolignol pathway Besseau et al, 2007).…”
Section: Compositional and Structural Changes In Lignin Of 4cl Transgmentioning
confidence: 99%
“…The results related to Cu are consistent with findings described by Kraal et al (2006), who established that at Cu(II) ions to tannic acid molar ratios higher than 0.01 the amounts of free and labile complex ions of Cu increase much more in comparison to the stable Cutannic acid complexes. Tannic acid was lately reported to effectively complex and reduce the Fe(III) ions at neutral pH (Lopes et al, 1999), likely due to a very high value of the stability constant of such a complex, evaluated to be of the order of 10 + 17 (Sungur and Uzar, 2008). At pH 5.0 and lower, the stability constants of the Fe-tannic acid complex are decreased by about 8-12 orders of magnitude (Sungur and Uzar, 2008), and this could be the reason for relatively low sorption efficiencies assessed for Amberlite XAD-16.…”
Section: Resin Characteristicsmentioning
confidence: 99%
“…Tannic acid was lately reported to effectively complex and reduce the Fe(III) ions at neutral pH (Lopes et al, 1999), likely due to a very high value of the stability constant of such a complex, evaluated to be of the order of 10 + 17 (Sungur and Uzar, 2008). At pH 5.0 and lower, the stability constants of the Fe-tannic acid complex are decreased by about 8-12 orders of magnitude (Sungur and Uzar, 2008), and this could be the reason for relatively low sorption efficiencies assessed for Amberlite XAD-16.…”
Section: Resin Characteristicsmentioning
confidence: 99%
“…The 5-OH group is usually not involved in the chelation due to its lesser proton acidity and the steric hindrance caused by the first complexation [22]. Related studies on flavonols Gal, Kae, Que and Myr have been reported previously [20][21][22][23][24][25][26][27][28][29][30][31].…”
Section: Introductionmentioning
confidence: 99%