Analytical and Bioanalytical Chemistry

, Volume 376, Issue 7, pp 1041–1052

Determination of protonation constants of some fluorinated polyamines by means of 13C NMR data processed by the new computer program HypNMR2000. Protonation sequence in polyamines

  • Chiara Frassineti
  • Lucia Alderighi
  • Peter Gans
  • Antonio Sabatini
  • Alberto Vacca
  • Stefano Ghelli
Special Issue Paper

DOI: 10.1007/s00216-003-2020-0

Cite this article as:
Frassineti, C., Alderighi, L., Gans, P. et al. Anal Bioanal Chem (2003) 376: 1041. doi:10.1007/s00216-003-2020-0

Abstract.

The pKa values of 6-fluoro-4,8-diazadodecane-1,12-diamine (6-fluorospermine) (1), 6,6-difluoro-4,8-diazadodecane-1,12-diamine (6,6-difluorospermine) (2), 6-fluoro-4-azaoctane-1,8-diamine (6-fluorospermidine) (3) and 6,6-difluoro-4-azaoctane-1,8-diamine (6,6-difluorospermidine) (4) in D2O solution have been determined at 40 °C from 13C NMR chemical shifts data using the new computer program HypNMR2000. The enthalpies of protonation of compounds 1–4 and the parent amines spermine (5) and spermidine (6) have been determined from microcalorimetric titration data. The values of ΔH° were used to derive basicity constants relative to 25 °C. The NMR data have been analysed by two different methods to obtain information on the protonation sequence in the polyamines 1–5. The protonation sequence for spermine is related to its biological activity.

Keywords

13C NMR Fluorinated compounds Polyamines Protonation constants Protonation enthalpies Protonation sequence 

Abbreviations

PKC

Protein kinase C

PS

Phosphatidylserine

VB

Microsoft Visual Basic

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Chiara Frassineti
    • 1
  • Lucia Alderighi
    • 3
  • Peter Gans
    • 2
  • Antonio Sabatini
    • 3
  • Alberto Vacca
    • 3
  • Stefano Ghelli
    • 4
  1. 1.Dipartimento di Scienze BiomedicheUniversità degli Studi di ModenaModenaItaly
  2. 2.Department of ChemistryThe University of LeedsLeedsEngland
  3. 3.Dipartimento di ChimicaUniversità degli Studi di Firenze Sesto FiorentinoItaly
  4. 4.SPIN Rubiera (Reggio Emilia)Italy

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