- Type of paper
: Paper in journal
Title: Siderophore chemistry of vanadium. Kinetics and
equilibrium of interaction between vanadium(IV) and desferrioxamine B in
aqueous acidic solutions
- Authors:
- Batinić-Haberle, Ines
- Biruš, Mladen
- Pribanić, Marijan
Journal: Inorganic Chemistry
Number: 26
ISSN: 0020-1669
Volume: 30
Year: 1991
Pages: from 4882 to 4887
Number of references: 32
Language: engleski
Summary: The kinetics and equilibrium of interaction between
vanadylsulfate and a natural trihydroxamate-based
siderophore,desferrioxamine B methanesulfonate, were
studiedspectrophotometrically in acidic aqueous perchlorate solutions of2.0
M ionic strength. The bi-, tetra-, and hexadentate-bondedcomplexes were
formed under these conditions, and their stabilityconstants were
calculated. The rate constants for the formationand hydrolysis of the bi-
and tetradentate complexes wereestimated. The formation of the bidentate
complex proceeds viatwo parallel pathways involving the hydrolyzed and
unhydrolyzedvanadyl-aquo species. The hydrolyzed form was found to react
withthe siderophore ca. 105 times faster than the unhydrolyzed form
Keywords: Siderophore chemistry, vanadium(IV), desferrioxamine B, kinetics, equilibrium
- Type of paper
: Paper in journal
Title: Equilibrium studies on complexation of iron(III) by
L-glutamo-gama-hydroxamic acid
- Authors:
- Kujundžić, Nikola
- Tešija, Andrea
- Pribanić, Marijan
Journal: Acta Pharmaceutica Jugoslavica
ISSN: 1330-0075
Volume: 41
Year: 1991
Pages: from 0 to 0
Number of references: 21
Language: engleski
Summary: In acidic and neutral solutions, L-glutamo-gama-hydroxamic
acidbinds ferric ion forming mono-, bis- andtris-hydroxamatoiron(III)
complexes. A comparison of the obtainedequilibrium and spectral data with
those of thehydroxamatoiron(III) complexes suggests that only
hydroxamategroup is involved in the complexation. Potential use of
thesecomplexes as a source of iron in animal nutrition is discussed.
Keywords: iron(III) complexes, L-glutamo-gama-hydroxamic acid, equilibrium
- Type of paper
: Paper in journal
Title: Effect of pressure on the complex formation and aquation
kinetics of iiron(III) with hydroxamic acids
- Authors:
- Biruš, Mladen
- van Eldik, Rudi
Journal: Inorganic Chemistry
ISSN: 0020-1669
Volume: 30
Year: 1991
Pages: from 4559 to 4563
Number of references: 18
Language: engleski
Summary: The activation and reaction volumes for the formation
andaquation of (acethydroxamato)iron(III) complexes, as well as
theactivation volumes for the formation of the (desferrioxamineB)iron(III)
complex, have been obtained by high-pressurestopped-flow and UV-vis
spectral measurements. The data indicatea gradual mechanistic changeover
from Ia to Id for the stewiseproton-catalyzed hydrolysis of the
tris(acethydroxamato)(III)complex and vice versa for the corresponding
formation reactions.The obtained results suggest that the substitution
behavior ofthe Fe(III) complexes is controlled by the presence of OH- or
A-in the coordination sphere.
Keywords: Activation volumes, iron(III), complexes, desferrioxamine B, acethydroxamic acid, aquation, kinetics, mechanism.
- Type of paper
: Paper in journal
Title: Equilibrium studies on complexation iron(III) by
alaninehydroxamic acid
- Authors:
- Kujundžić, Nikola
- Boban, Violeta
- Todorić-Kovačević, Vesna
Journal: Journal of the Chemical Society, Perkin Transactios 2
Number: 6
ISSN: 0031-7144
Volume: 47
Year: 1992
Pages: from 433 to 435
Number of references: 21
Language: engleski
Summary: In acidic and neutral solutions alaninehydroxami acid
bindsferric ion forming mono-, bis- and
tris(hydroxamato)iron(III)complexes. The results suggest that only the
hydroxamate group isinvolved in the complexation. Potential use of these
complexes asa source of iron in anim nutrition is discussed.
Keywords: irn(III), complexes, alaninehydroxamic acid, equilibrium
- Type of paper
: Paper in journal
Title: Kinetics and mechanism of the reduction of cytochrome c
with L-cysteine
- Authors:
- Biruš, Mladen
- Romić, Željko
Journal: Acta Pharmaceutica
ISSN: 1330-0075
Volume: 42
Year: 1992
Pages: from 231 to 237
Number of references: 18
Language: engleski
Summary: Depedence of the rate of reduction of ferricytochrome c
byL-cysteine on the reaction solution acidity has been determined.The
reduction rate increases with the increase of pH up to 9 butdecreases after
this value. The rate increase has beeninterpreted as an effect of the
concentration shift from lessreactive thiolate form od cysteine. The rate
decrease has beenaccounted for by the formation of less reactive forms
ofcyt c upon the deprotonation. The obtained data indicatethat the
reduction of cyt c by cysteine occurs by two
parallel pathways, one including electron transfer at theexposed heme edge
and the another trough the protein structure .
Keywords: Cytochrome c, L-cysteine, reduction, kinetics, mechanism
- Type of paper
: Paper in journal
Title: Kinetics of complexation of iron(III) in aqueous solution
- Authors:
- Biruš, Mladen
- Kujundžić, Nikola
- Pribanić, Marijan
Journal: Journal of the Chemical Society, Perkin Transactions 2
Number: 3
ISSN: 0079-6743
Volume: 18
Year: 1993
Pages: from 171 to 271
Number of references: 198
Language: engleski
Summary: Ferric ions appear to be the most investigated metal center
inthe studies of substitution reaction mechanisms. The mainmechanistic
topics in iron(III) substitution reactions have beenthe distinction
between Ia and Id interchange mechanisms. Themeasurements of the volume of
activation of many of substitutionreactions of iron(III) have shown that
the sign and amount ofthis parameter is the most reliable criterion in
diagnosing Iaand Id mechanisms, being superior to the other
activationparameters. The other hypothesis and theories which have
beenapplied to the iron(III) substitution reactions are discussed.
Keywords: Iron(III), kinetics, complexation, mechanism
- Type of paper
: Paper in journal
Title: Equilibrium studies on complexation of iron(III) with
lysinehydroxamic acid
- Authors:
- Kujundžić, Nikola
- Inić, Suzana
Journal: Acta Pharmaceutica
Number: 1
ISSN: 1330-0075
Volume: 44
Year: 1994
Pages: from 61 to 69
Number of references: 22
Language: engleski
- Type of paper
: Paper in journal
Title: Equilibrium studies on complexation of iron(III) by
serinehydroxamic acid
- Authors:
- Kujundžić, Nikola
- Inić, Suzana
- Todorić-Kovačević, Vesna
Journal: Acta Pharmaceutica
Number: 2
ISSN: 1330-0075
Volume: 45
Year: 1995
Pages: from 83 to 90
Number of references: 30
Language: engleski
