Quercetin 3 3 4 5 7 pentahydroxyflavone Complexes with Calcium II and Magnesium II Its Potentiometrie and Spectrophotometric studies

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Erdoğan G., Karadağ R.

Reviews In Analytical Chemistry, cilt.24, sa.1, ss.9-23, 2005 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 24 Sayı: 1
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1515/revac.2005.24.1.9
  • Dergi Adı: Reviews In Analytical Chemistry
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.9-23
  • Marmara Üniversitesi Adresli: Evet

Özet

Abstract: In this study, the stability constants of the complexes of quercetin formed with calcium(II) and magnesium(II) were determined potentiometrically by using Calvin-Bjerrum and Irving Rossotti methods and by spectrophotometry. The evaluated protonation constants of the ligand were found: logK,=9.63±0.11and logK2 = 8.32±013, at the 25°C. For the calcium and magnesium complexes logarithms of the stability constants were found: for Ca : logK=2.91±0.04, and for Magnesium: logK=3.51±0.07. From the results, the components of quercetin-metal complexes are given 1:1 (quercetin:metal ratio) both Ca(II) and Mg(II). 

Key words: quercetin, magnesium, calcium, stability constant, potentiometri, spectrophotometri