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Spectrophotometric and electrochemical determination of the formation constants of the complexes Curcumin–Fe(III)–water and Curcumin–Fe(II)–water

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Title: Spectrophotometric and electrochemical determination of the formation constants of the complexes Curcumin–Fe(III)–water and Curcumin–Fe(II)–water
Authors: Bernabé-Pineda, Marganta1, Ramírez-Silva, Maria Teresa1, Romero-Romo, Mario Alberto2, González-Vergara, Enrique3, Rojas-Hernández, Alberto1 suemi918@xanum.uam.mx
Source: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy. Apr2004, Vol. 60 Issue 5, p1105. 9p.
Subjects: Iron, Spectrum analysis, Voltammetry, Chemical reactions, Chemicals, Ions
Abstract: The formation of complexes among the Curcumin, Fe(III) and Fe(II) was studied in aqueous media within the 5–11 pH range by means of UV-Vis spectrophotometry and cyclic voltammetry. When the reaction between the Curcumin and the ions present in basic media took place, the resulting spectra of the systems Curcumin–Fe(III) and Curcumin–Fe(II) presented a similar behaviour. The cyclic voltammograms in basic media indicated that a chemical reaction has taken place between the Curcumin and Fe(III) before that of the formation of complexes. Data processing with SQUAD permitted to calculate the formation constants of the complexes Curcumin–Fe(III), corresponding to the species FeCur (log β1 1 0=22.25±0.03) and FeCur(OH)− (log β1 1-1=12.14±0.03), while for the complexes Curcumin–Fe(II) the corresponding formation constants of the species FeCur− (log β1 1 0=9.20±0.04), FeHCur (log β1 1 1=19.76±0.03), FeH2Cur+ (log β1 1 2=28.11±0.02). [Copyright &y& Elsevier]
Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 12779416
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  Label: Title
  Group: Ti
  Data: Spectrophotometric and electrochemical determination of the formation constants of the complexes Curcumin–Fe(III)–water and Curcumin–Fe(II)–water
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  Data: <searchLink fieldCode="AR" term="%22Bernabé-Pineda%2C+Marganta%22">Bernabé-Pineda, Marganta</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ramírez-Silva%2C+Maria+Teresa%22">Ramírez-Silva, Maria Teresa</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Romero-Romo%2C+Mario+Alberto%22">Romero-Romo, Mario Alberto</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22González-Vergara%2C+Enrique%22">González-Vergara, Enrique</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Rojas-Hernández%2C+Alberto%22">Rojas-Hernández, Alberto</searchLink><relatesTo>1</relatesTo><i> suemi918@xanum.uam.mx</i>
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  Data: <searchLink fieldCode="JN" term="%22Spectrochimica+Acta+Part+A%3A+Molecular+%26+Biomolecular+Spectroscopy%22">Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy</searchLink>. Apr2004, Vol. 60 Issue 5, p1105. 9p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Iron%22">Iron</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Voltammetry%22">Voltammetry</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reactions%22">Chemical reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Chemicals%22">Chemicals</searchLink><br /><searchLink fieldCode="DE" term="%22Ions%22">Ions</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The formation of complexes among the Curcumin, Fe(III) and Fe(II) was studied in aqueous media within the 5–11 pH range by means of UV-Vis spectrophotometry and cyclic voltammetry. When the reaction between the Curcumin and the ions present in basic media took place, the resulting spectra of the systems Curcumin–Fe(III) and Curcumin–Fe(II) presented a similar behaviour. The cyclic voltammograms in basic media indicated that a chemical reaction has taken place between the Curcumin and Fe(III) before that of the formation of complexes. Data processing with SQUAD permitted to calculate the formation constants of the complexes Curcumin–Fe(III), corresponding to the species FeCur (<F>log β1 1 0=22.25±0.03</F>) and FeCur(OH)− (<F>log β1 1-1=12.14±0.03</F>), while for the complexes Curcumin–Fe(II) the corresponding formation constants of the species FeCur− (<F>log β1 1 0=9.20±0.04</F>), FeHCur (<F>log β1 1 1=19.76±0.03</F>), FeH2Cur+ (<F>log β1 1 2=28.11±0.02</F>). [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/S1386-1425(03)00344-5
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        Text: English
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        Type: general
      – SubjectFull: Spectrum analysis
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      – SubjectFull: Voltammetry
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      – SubjectFull: Chemicals
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      – SubjectFull: Ions
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      – TitleFull: Spectrophotometric and electrochemical determination of the formation constants of the complexes Curcumin–Fe(III)–water and Curcumin–Fe(II)–water
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            NameFull: Bernabé-Pineda, Marganta
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            NameFull: Ramírez-Silva, Maria Teresa
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            NameFull: Romero-Romo, Mario Alberto
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            NameFull: González-Vergara, Enrique
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            NameFull: Rojas-Hernández, Alberto
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              Text: Apr2004
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              Y: 2004
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              Value: 60
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            – TitleFull: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy
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