4. Conclusion
MEGA, GA and PCA widely co-exists with citrate and ferric ions
in various plant foodstuffs. By using isothermal titration calorimetry
(ITC), we demonstrate that these three phenolic acids can bind
to Fe(III) in the presence of citrate with the same stoichiometry
(3:1) at neutral pH. Among them, MEGA shows the strongest iron
binding stability constant and rate constant, followed by GA and
PCA. Since the binding constant of these three ligands (K is in the
range of 1 _ 1034 M_1 to 1 _ 1036 M_1) is much stronger than that
of Fe(III)–citrate complex (K = 1.32 _ 1019 M_1), these ligands can
coordinate with Fe(III) in the presence of citrate to produce complexes
with an octahedral geometry, respectively. All these findings
advance our outstanding of the interaction between
different components in a complex food system and can provide
useful information to select phenolic acids as chelators for iron
(III).
4. Conclusion
MEGA, GA and PCA widely co-exists with citrate and ferric ions
in various plant foodstuffs. By using isothermal titration calorimetry
(ITC), we demonstrate that these three phenolic acids can bind
to Fe(III) in the presence of citrate with the same stoichiometry
(3:1) at neutral pH. Among them, MEGA shows the strongest iron
binding stability constant and rate constant, followed by GA and
PCA. Since the binding constant of these three ligands (K is in the
range of 1 _ 1034 M_1 to 1 _ 1036 M_1) is much stronger than that
of Fe(III)–citrate complex (K = 1.32 _ 1019 M_1), these ligands can
coordinate with Fe(III) in the presence of citrate to produce complexes
with an octahedral geometry, respectively. All these findings
advance our outstanding of the interaction between
different components in a complex food system and can provide
useful information to select phenolic acids as chelators for iron
(III).
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