Investigation of complexes tannic acid and myricetin with Fe(III)

SUNGUR Ş., Uzar A.

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, cilt.69, sa.1, ss.225-229, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 69 Sayı: 1
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.saa.2007.03.038
  • Dergi Adı: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.225-229
  • Anahtar Kelimeler: Flavonoid, Iron chelators, Myricetin, Slope ratio method, Tannic acid, UV-VS molecular absorption spectroscopy
  • Hatay Mustafa Kemal Üniversitesi Adresli: Evet

Özet

The pH dependence of the complexes was determined by both potentiometric and spectrophotometric studies. Stability constants and stoichiometries of the formed complexes were determined using slope ratio method. Fe(III) was formed complexes with tannic acid of various stoichiometries, which in the 1:1 molar ratio at pH < 3, in the 2:1 molar ratio at pH 3-7 and in the 4:1 molar ratio at pH > 7. Fe(III) was formed complexes with myricetin in the 1:2 molar ratio at pH 4 and 5 and in the 1:1 molar ratio at pH 6. Stability constant values were found to be 105 to 1017 and 105 to 109 for Fe(III)-tannic acid complexes and Fe(III)-myricetin complexes. Both tannic acid and myricetin were possessed minimum affinities to Cu(II) and Zn(II). They had less affinity for Al(III) than for Fe(III). © 2007 Elsevier B.V. All rights reserved.