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1. Electron paramagnetic resonance (EPR) studies on stable and transient radicals in humic acids from compost, soil, peat and brown coal. Jezierski, Adam; Czechowski, Franciszek; Jerzykiewicz, Maria; Chen, Yona; Drozd, Jerzy. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy vol. 56 issue 2 February 1, 2000. p. 379 - 385

 Quantitative EPR method was applied to characterise four types of humic acids (HA)… (more)

Keywords: Humic acids; EPR; Free radical; Humic acids-copper(II) complex; Semiquinone radical; Iminoxy radical

ISSN: 1386-1425.

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2. Quantitative EPR study on free radicals in the natural polyphenols interacting with metal ions and other environmental pollutants. Jezierski, Adam; Czechowski, Franciszek; Jerzykiewicz, Maria; Golonka, Iwona; Drozd, Jerzy; Bylinska, Ewa; Chen, Yona; Seaward, Mark R.D. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy vol. 58 issue 6 April, 2002. p. 1293 - 1300

 Quantitative electron paramagnetic resonance (EPR) method was applied to characterise radicals stabilised in… (more)

Keywords: Lichens; Mosses; Composts; Brown coals; Humic acids; Polyphenols; Semiquinones; EPR

ISSN: 1386-1425.

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3. Formation of new radicals in humic acids upon interaction Pb(II) ions. Jerzykiewicz, Maria. Geoderma vol. 122 issue 2-4 October, 2004. p. 305-309

 The influence of lead ions on the free radical concentration and the structure… (more)

Keywords: Humic acids; Pb(II); EPR; Semiquinone free radicals; 13C CP MAS NMR; FTIR

DOI: 10.1016/j.geoderma.2004.01.017. ISSN: 0016-7061.

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4. The antioxidant and anticorrosive properties of crude glycerol fraction from biodiesel production. Jerzykiewicz, Maria; Cwielag, Irmina; Jerzykiewicz, Wojciech. Journal of Chemical Technology & Biotechnology vol. 84 issue 8 August 2009. p. 1196 - 1201

 BACKGROUND: Raw glycerol fractions as the waste material from biodiesel production were investigated… (more)

Keywords: biodiesel; antioxidants; ESR spectroscopy; glycerol fraction; Herbert test

DOI: 10.1002/jctb.2157. ISSN: 0268-2575.

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5. The pH-induced shift in the g-tensor components of semiquinone-type radicals in humic acids – DFT and EPR studies. Witwicki, Maciej; Jaszewski, Adrian R.; Jezierska, Julia; Jerzykiewicz, Maria; Jezierski, Adam. Chemical Physics Letters vol. 462 issue 4-6 September 10, 2008. p. 300-306

 DFT method has been applied to calculate pKa and g-tensors values of semiquinone… (more)

DOI: 10.1016/j.cplett.2008.07.086. ISSN: 0009-2614.

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6. Influence of Pb(II) Ions on the EPR Properties of the Semiquinone Radicals of Humic Acids and Model Compounds: High Field EPR and Relativistic DFT Studies. Witwicki, Maciej; Jerzykiewicz, Maria; Jaszewski, Adrian R.; Jezierska, Julia; Ozarowski, Andrzej. The Journal of Physical Chemistry A vol. 113 issue 51 December 24, 2009. p. 14115-14122

 X-band (9.76 GHz) and high field (416.00 GHz) electron paramagnetic resonance spectroscopy (EPR)… (more)

DOI: 10.1021/jp906289d. ISSN: 1089-5639.

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7. α-Tocopherol impact on oxy-radical induced free radical decomposition of DMSO: Spin trapping EPR and theoretical studies. Jerzykiewicz, Maria; Ćwieląg-Piasecka, Irmina; Witwicki, Maciej; Jezierski, Adam. Chemical Physics vol. 383 issue 1-3 May 26, 2011. p. 27-34

 EPR spin trapping and theoretical methods such as density functional theory (DFT) as… (more)

Keywords: EPR; DFT; QCISD; Spin trapping; PBN; α-Tocopherol; DMSO

DOI: 10.1016/j.chemphys.2011.03.028. ISSN: 0301-0104.

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8. H-binding groups in lignite vs. soil humic acids: NICA-Donnan and spectroscopic parameters. Drosos, Marios; Jerzykiewicz, Maria; Deligiannakis, Yiannis. Journal of Colloid And Interface Science vol. 332 issue 1 April 1, 2009. p. 78-84

 A comparative study has been carried out for two sets of humic acids… (more)

Keywords: Humic acid; Lignite; Soil; Greek; NICA; H-binding; 13C NMR; Spectroscopy

DOI: 10.1016/j.jcis.2008.12.023. ISSN: 0021-9797.

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9. The pH-induced shift in the g-tensor components of semiquinone-type radicals in humic acids – DFT and EPR studies. Witwicki, Maciej; Jaszewski, Adrian R.; Jezierska, Julia; Jerzykiewicz, Maria; Jezierski, Adam. Chemical Physics Letters vol. 462 issue 4-6 September 10, 2008. p. 300-306

 DFT method has been applied to calculate pKa and g-tensors values of semiquinone… (more)

DOI: 10.1016/j.cplett.2008.07.086. ISSN: 0009-2614.

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10. EPR spin trapping and DFT studies on structure of active antioxidants in biogycerol. Jerzykiewicz, Maria; Ćwieląg-Piasecka, Irmina; Witwicki, Maciej; Jezierski, Adam. Chemical Physics Letters vol. 497 issue 1-3 September 10, 2010. p. 135-141

 Spin trapping EPR spectroscopy and DFT methods were used to investigate the structure… (more)

DOI: 10.1016/j.cplett.2010.07.101. ISSN: 0009-2614.

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11. Fluorescence behaviour of Zn and Ni complexes of humic acids from different sources. Provenzano, Maria Rosaria; D'Orazio, Valeria; Jerzykiewicz, Maria; Senesi, Nicola. Chemosphere vol. 55 issue 6 May, 2004. p. 885-892

 Conventional fluorescence spectroscopy in the excitation, emission and synchronous scan modes and three-dimensional… (more)

Keywords: Fluorescence spectroscopy; Fluorescence quenching; Humic acids; Metal complexes; Zn; Ni

DOI: 10.1016/j.chemosphere.2003.11.040. ISSN: 0045-6535.

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12. Influence of metal ions binding on free radical concentration in humic acids. A quantitative electron paramagnetic resonance study. Jerzykiewicz, Maria; Jezierski, Adam; Czechowski, Franciszek; Drozd, Jerzy. Organic Geochemistry vol. 33 issue 3 March, 2002. p. 265-268

 The influence of metal ions, e.g. Co(II), Cu(II), Mn(II), Ni(II), Fe(II), on free… (more)

ISSN: 0146-6380.

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13. Humic and hymatomelanic acids interaction with lanthanide ions. Jerzykiewicz, Maria. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy vol. 96 October, 2012. p. 127-131

 The interactions of lanthanide ions, REE(III), with semiquinone radicals naturally occurring in humic… (more)

Keywords: Humic substances; Semiquinone radicals; Lanthanide(III) ions; EPR spectroscopy

DOI: 10.1016/j.saa.2012.05.019. ISSN: 1386-1425.

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14. Pro- and Antioxidative Effect of α-Tocopherol on Edible Oils, Triglycerides and Fatty Acids. Jerzykiewicz, Maria; Ćwieląg-Piasecka, Irmina; Jezierski, Adam. Journal of the American Oil Chemists' Society vol. 90 issue 6 June 2013. p. 803 - 811

  Using advanced electron paramagnetic resonance techniques (EPR), oxidation of crude vegetable oils… (more)

Keywords: Oils; Fatty acids; α-Tocopherol; EPR

DOI: 10.1007/s11746-013-2227-y. ISSN: 0003-021X.

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15. The effect of Hg(II) ions on the free radicals of humic substances and their model compounds. Jerzykiewicz, Maria. Chemosphere vol. 92 issue 4 July, 2013. p. 445-450

 Humic acids (HAs) and humin (HU) complexes with Hg(II) ions were studied using… (more)

Keywords: Humic substances; Semiquinone radicals; Hg(II); EPR spectroscopy

DOI: 10.1016/j.chemosphere.2013.01.048. ISSN: 0045-6535.

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16. Synthesis, crystal structure and magnetic properties of a novel copper(II) complex with sulfoisophthalic acid. Kurc, Teresa; Videnova-Adrabinska, Veneta; Turowska-Tyrk, Ilona; Duczmal, Marek; Jerzykiewicz, Maria. Journal of Molecular Structure vol. 1054-1055 December 24, 2013. p. 134-142

 A new Cu(II) complex, [Cu2(μ2-OH2)2(HSIP)2(H2O)6] (H3SIP=5-sulfoisophthalic acid), has been synthesized and characterized by… (more)

Keywords: Copper(II) complex; Crystal structure; Hydrogen-bonded network; EPR spectra; Magnetic properties

DOI: 10.1016/j.molstruc.2013.08.059. ISSN: 0022-2860.

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