Phenol group in pyridoxamine acts as a stabilizing element for its carbinolamines and Schiff bases

Show simple item record Caldés Melis, Catalina Vilanova Canet, Bartolomé Adrover Estelrich, Miguel Muñoz Izquierdo, Francisco Donoso Pardo, Josefa Laurentina 2018-10-30T13:25:53Z
dc.description.abstract [eng] Pyridoxamine (PM), a natural derivative of vitamin B6, possesses a high biological and biomedical significance by virtue of its acting as enzyme cofactor in amino acid metabolism and as inhibitor in the nonenzymatic glycation of proteins. Both types of processes require the initial formation of a Schiff base. In this work, we used NMR spectroscopy to study the formation mechanism for a Schiff base between PM and formaldehyde (FA). This allowed the Schiff base and an intermediate carbinolamine (CA) to be detected. The Schiff base was found to be in isomeric equilibrium with a hemiaminal (HE) form. The formation equilibrium constants for the CA and HE over the pD range of 6.0<br>13.0 were determined and compared with those for the reaction between 4-picolylamine (PAM) and formaldehyde (FA). The comparison revealed a strong influence of the phenol group on the equilibrium constant. Based on the results, the phenol group in PM is a key structural element towards stabilizing the resulting carbinolamine and Schiff base.
dc.format application/pdf
dc.relation.ispartof Chemistry & Biodiversity, 2011, vol. 8, num. 7, p. 1318-1332
dc.rights , 2011
dc.subject.classification 54 - Química
dc.subject.other 54 - Chemistry. Crystallography. Mineralogy
dc.title Phenol group in pyridoxamine acts as a stabilizing element for its carbinolamines and Schiff bases
dc.type info:eu-repo/semantics/article 2018-10-30T13:25:53Z info:eu-repo/date/embargoEnd/2075-01-01
dc.embargo 2075-01-01
dc.subject.keywords HPLC
dc.subject.keywords <SUP>1</SUP>H-NMR
dc.subject.keywords Cinética química
dc.subject.keywords Chemical Kinetics
dc.subject.keywords Pyridoxamine (PM)
dc.rights.accessRights info:eu-repo/semantics/embargoedAccess

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