Abstract
Abstract The equilibrium involved in the complexation of Pr(EDTA)− ions by pyridoxamine phosphate have been studied by potentiometric and 1H NMR titrations. Two main sites - phosphate and phenolate groups - are implied in the coordination of lanthanide ions. Vitamin B6, in it's various forms, has been demonstrated to interact with metal cationslY2. As the coordination site may vary at any state of protonation of the molecule, several forms of labile complexes may be simultaneously present when pyridoxamine phosphate (Fig. 1) is titrated with lanthanide cations. According to the pH range, phosphate, phenolic, amine or pyridine groups are potentiel candidate3,4. These will readily coordinate to the open half sphere of the soluble Pr(EDTA)− ions. This complex had to be used as free metal cations will precipitate in the investigated pH range5,6. The paramagnetic shifts induced in the NMR spectra of the pyridoxamine phosphate molecule allow a monitoring of the complexation process. A correct treatement of the ...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
