Calcium complexing behaviour of lactate in neutral to highly alkaline medium

Csilla Dudás, Bence Kutus, Éva Böszörményi, Gábor Peintler, Amr A.A. Attia, Alexandru Lupan, Zoltán Kele, P. Sipos, I. Pálinkó

Research output: Article

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, 13C NMR spectroscopy, ESI-MS spectroscopy and solubility measurements. In close to neutral solutions the formation of the CaLac+ and CaLac2 0 complexes were detected with formation constants of logK1,1 = 0.99 ± 0.02 and logβ1,2 = 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 pKa = 15.8 ± 0.2. In highly alkaline medium, the formation of the CaLacOH0 and CaLac(OH)2 complexes were detected with the corresponding formation constants being logβ1,1,1 = 1.35 ± 0.09 and logβ1,1,2 = 1.43 ± 0.06. The structures of the CaLac+ and CaLacOH0 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 - márc. 15 2019

Fingerprint

Lactic Acid
Calcium
Deprotonation
Molecular modeling
Ionic strength
Nuclear magnetic resonance spectroscopy
Solubility
Spectroscopy
Acids

Keywords

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Spectroscopy
    • Organic Chemistry
    • Inorganic Chemistry

    Cite this

    Calcium complexing behaviour of lactate in neutral to highly alkaline medium. / Dudás, Csilla; Kutus, Bence; Böszörményi, Éva; Peintler, Gábor; Attia, Amr A.A.; Lupan, Alexandru; Kele, Zoltán; Sipos, P.; Pálinkó, I.

    In: Journal of Molecular Structure, Vol. 1180, 15.03.2019, p. 491-498.

    Research output: Article

    Dudás, C, Kutus, B, Böszörményi, É, Peintler, G, Attia, AAA, Lupan, A, Kele, Z, Sipos, P & Pálinkó, I 2019, 'Calcium complexing behaviour of lactate in neutral to highly alkaline medium' Journal of Molecular Structure, vol. 1180, pp. 491-498. https://doi.org/10.1016/j.molstruc.2018.12.020
    Dudás C, Kutus B, Böszörményi É, Peintler G, Attia AAA, Lupan A et al. Calcium complexing behaviour of lactate in neutral to highly alkaline medium. Journal of Molecular Structure. 2019 márc. 15;1180:491-498. https://doi.org/10.1016/j.molstruc.2018.12.020
    Dudás, Csilla ; Kutus, Bence ; Böszörményi, Éva ; Peintler, Gábor ; Attia, Amr A.A. ; Lupan, Alexandru ; Kele, Zoltán ; Sipos, P. ; Pálinkó, I. / Calcium complexing behaviour of lactate in neutral to highly alkaline medium. In: Journal of Molecular Structure. 2019 ; Vol. 1180. pp. 491-498.
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    AU - Attia, Amr A.A.

    AU - Lupan, Alexandru

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