Calcium complexing behaviour of lactate in neutral to highly alkaline medium

Csilla Dudás, Bence Kutus, Éva Böszörményi, G. Peintler, Amr A.A. Attia, Alexandru Lupan, Z. Kele, Pál Sipos, István Pálinkó

Research output: Contribution to journalArticle

Abstract

The calcium complexing properties as well as the acid-base behaviour of D,L-lactate have been investigated in both neutral and alkaline media by Ca-ISE potentiometry, 13 C NMR spectroscopy, ESI-MS spectroscopy and solubility measurements. In close to neutral solutions the formation of the CaLac + and CaLac 2 0 complexes were detected with formation constants of logK 1,1 = 0.99 ± 0.02 and logβ 1,2 = 1.42 ± 0.03 (I = 4 M, T = 25 °C). These data are consistent with previously reported literature data measured at lower ionic strengths. The alkaline deprotonation constant of lactate has been determined to be pK a = 15.8 ± 0.2. In highly alkaline medium, the formation of the CaLacOH 0 and CaLac(OH) 2 complexes were detected with the corresponding formation constants being logβ 1,1,1 = 1.35 ± 0.09 and logβ 1,1,2 = 1.43 ± 0.06. The structures of the CaLac + and CaLacOH 0 complexes were optimized by molecular modelling calculations.

Original languageEnglish
Pages (from-to)491-498
Number of pages8
JournalJournal of Molecular Structure
Volume1180
DOIs
Publication statusPublished - Mar 15 2019

Keywords

  • Ca complexing properties of D,L lactate
  • ESI-MS spectroscopy
  • Molecular modelling
  • NMR spectroscopy
  • Neutral and alkaline medium

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry

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