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Binding of oxovanadium(IV) complexes to blood serum albumins
Cobbina, Enoch; Mehtab, Sameena; Correia, Isabel; Gonçalves, Gisela; Tomaz, Isabel; Cavaco, Isabel Maria Palma Antunes; Jakusch, Tamás; Eneyedi, EvaIn this work the binding of VIVO2+ and VIVO-complexes to serum albumins {human serum albumin (HSA), bovine serum albumin (BSA) and porcine serum albumin (PSA)} are studied using circular dichroism (CD), electron paramagnetic resonance (EPR) and visible absorption spectroscopy. The results confirm previous findings that VIVO2+ occupies at least two types of binding sites on albumin: ‘the strong vanadium binding ...
Vanadium (IV and V) Complexes of Reduced Schiff Bases Derived from the Reaction...
Pessoa, João Costa; Marcão, Susana; Correia, Isabel; Gonçalves, Gisela; Dörnyei, Agnes; Kiss, Tamás; Jakusch, Tamás; Tomaz, Isabel; Castro, M.The reduced Schiff bases of salicylaldehyde [and o-vanillin (o-van)] with D,L- and L-diaminopropionic acid (DPA), designated by salDPA, and L-2,4-diaminopentanoic acid [ornithine (Orn)], designated by salOrn, as well as the VIVO2+ and VVO2+ complexes of salDPA were prepared. The compounds were characterised in the solid state and in solution. The structure of H4salDPA+Cl- was determined by X-ray diffraction. Co...
Vanadium(IV and V) Complexes of Schiff Bases and Reduced Schiff Bases Derived f...
Correia, Isabel; Pessoa, João Costa; Duarte, M. Teresa; Piedade, M. Fátima Minas da; Jackush, Tamás; Kiss, Tamás; Castro, M. Margarida C. A.Several sal2en-type reduced Schiff bases have been prepared from the reaction of 2 equiv. of salicylaldehyde (or derivatives) with ethylenediamine followed by reduction with NaBH4 and subsequently characterised. The water-soluble ligands (SO3-sal)2en and R(SO3-sal)2en (SO3-sal = salicylaldehyde-5-sulphonate) have been studied by pH potentiometry and 1H NMR spectroscopy and the protonation constants of R(SO3-sal...
N,N'-Ethylenebis(pyridoxylideneiminato) and N,N'-Ethylenebis(pyridoxylaminato):...
Correia, Isabel; Pessoa, João Costa; Duarte, M. Teresa; Henriques, Rui T.; Piedade, M. Fátima M.; Veiros, Luís F.; Jakusch, Tamás; Kiss, TamásThe Schiff base N,Nprime-ethylenebis(pyridoxylideneiminato) (H2pyr2en, 1) was synthesized by reaction of pyridoxal with ethylenediamine; reduction of H2pyr2en with NaBH4 yielded the reduced Schiff base N,Nprime-ethylenebis(pyridoxylaminato) (H2Rpyr2en, 2); their crystal structures were determined by X-ray diffraction. The totally protonated forms of 1 and 2 correspond to H6L4+, and all protonation constants wer...