Binding of the Trace Elements: Cu(II) and Fe(III) to the Native and Modified Nutritive Potato Starches Studied by EPR

• Authors: H. Śmigielska , G. Lewandowicz , J. Goslar , S. Hoffmann
• Languages of publication: EN

Abstracts

EN

The Cu(II) and Fe(III) ions have been adsorbed by four potato starches of different degrees of oxidation (different numbers of COOH groups replacing host CH_2OH groups): native (no oxidized), white (pudding) with oxidation degree of 0.04%, gelating (0.1%), and LUBOX starch (0.5%). Concentration of the ions in starches was determined from atomic absorption and EPR spectrum intensity. For small concentration of the adsorbed ions (below 4 mg/g) nearly all ions are adsorbed from the solution. EPR shows that adsorbed copper(II) ions are chemically bonded to the starch molecules (preferably) at COOH sites and uniformly dispersed in the starch structure. The complexes are typical of octahedral or square-quadratic coordination with spin-Hamiltonian parameters g_ǁ=2.373, g_⊥= 2.080, A_ǁ=12.1 mT, A_⊥=1.0 mT. For higher concentrations the Cu(II) displays a tendency to clustering. Iron(III) ions are introduced into starch in a form of clusters mainly, even for the smallest concentration. The highest concentrations of both Cu(II) and Fe(III) were observed in LUBOX starch having the highest degree of oxidation.

Keywords

EN

76.30.-v; 87.15.-v

Discipline

• 87.15.-v: Biomolecules: structure and physical properties(for NMR of biomolecules, see 82.56.Pp)
• 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 303-310

Dates

published

2005-08

received

2005-04-24

Contributors

author

H. Śmigielska

• Poznań University of Economics, Faculty of Commodity Science, Al. Niepodległości 10, 60-967 Poznań, Poland

author

G. Lewandowicz

• A. Cieszkowski Agricultural University, Dept. of Biotechnology and Food Microbiology, Wojska Polskiego 48, 60-627 Poznań, Poland

author

J. Goslar

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

S. Hoffmann

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.108.303