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Sequestering ability of phytate towards protonated BPEI and other polyammonium cations in aqueous solution by Francesco Crea; Concetta De Stefano; Nunziatina Porcino; Silvio Sammartano is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The interaction between protonated branched poly(ethylenimine) [BPEI] and phytate (1,2,3,4,5,6 hexakis (dihydrogen phosphate) myo-inositol) [Phy] was studied potentiometrically. The measurements were carried out at t = 25 °C and at low ionic strength values, without addition of supporting electrolyte, to avoid interferences with other anions and cations. In order to simplify the data treatment, BPEI was considered as a simple tetramine. Different species Phy(BPEI)H j , with j = 6,7,8, and Phy(BPEI) 2 H 7 were found, having quite high stability. The ability of phytate to sequester BPEI was quantified by considering the parameter pL 50 , namely the concentration (-log [Phy] tot ) necessary to bind 50% of polyammonium cation (as trace). In our experimental conditions, for the system phytate-BPEI-proton we have pL 50 = 7.01, at pH = 7.4 and I = 0.04 mol L -1 . As for other phytate-polyammonium cation systems, the stability of the phytate-BPEI species is strictly proportional to the charges involved in the formation reactions. Therefore, it was possible to calculate the free energy contribution per bond, ΔG b U = 4.4 ± 0.4 kJ mol -1 . The dependence on temperature and ionic strength of

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Author

Francesco Crea; Concetta De Stefano; Nunziatina Porcino; Silvio Sammartano

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0301-4622)

Published

2008

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)