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Effect of storage time on microwave saturation of EPR spectra of thermally sterilized streptomycin and its practical applications

Ramos P., Pilawa B., Bernaś M.

Journal of Medical Informatics & Technologies

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2010

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Vol. 15

185--191

EN

Electron paramagnetic resonance spectroscopy at X-band (9.3 GHz) is used as the tool of optimalization of storage of thermally sterilized aminoglycoside antibiotic - streptomycin. Thermal sterilization at different conditions was performed according to the norms. Changes in free radicals system of this drug during storage after sterilization were detected. Lineshape analysis and microwave saturation of EPR spectra were done. Free radical concentrations were determined. Microwave saturation EPR analysis is proposed as useful method to determine the best conditions of storage of sterilized drugs.

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Comparatwe EPR analysis of oxygen interactions with plants carbonized at different temperatures

Bartłomiejczyk S., Pilawa B., Krzesińska M., Pusz S., Zachariasz J., Wałach W.

Engineering of Biomaterials

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2008

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Vol. 11, no. 73

3-5

EN

Carbon materials, bamboo (Bambusa vulagris) and yucca (Yucca flaccida) pyrolysed at 550°C, 750°C and 950°C, were tested as oximetric probes by electron paramagnetic resonance spectroscopy at X-band (9.3 GHz). The following parameters of the spectra: amplitude, linewidth and g-factor, were determined. Influence of oxygen molecules 02 on EPR spectra of the individual carbon materials was compared. Strong EPR spectra were recorded for samples carbonized at 550°C and weak signals were obtained for plants carbonized at higher temperatures: 750°C and 950°C. It was stated that amplitudes of EPR lines of all the carbonized plants decrease in the air environment compared to amplitudes of spectra measured in vacuum. This effect increases with degree of vacuum. Changes in the EPR spectra of samples studied in the air environment may be applied in medicine to determination of oxygen content in different cells. Because of strong resonance signals as oximetric probes we proposed bamboo and yucca carbonized at 550°C, and we rejected plants carbonized at 750°C and 950°C with Iow EPR signals.

3

Ability of 2,4D and 2,4DP Herbicides to Combine with Metal Ions of Biological Interest (Part 1): Copper(II) Complexes

Zwolińska A., Ptaszyński B., Wrzeszcz G.

Polish Journal of Chemistry

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2004

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Vol.78 /nr 11-12

1987-1996

EN

Copper(II) complexes with the commercial auxin herbicides 2,4-dichlorophenoxyacetic acid (2,4D; C8H6O3Cl2) and 2-(2,4-dichlorophenoxy)-propionic acid (2,4DP;C9H8O3Cl2) were prepared and characterized. On the basis of the results of elemental analysis and Cu(II) determination, the following molecular formulae were proposed for the obtained compounds: Cu(C8H5O3Cl2)2.4H2O (Cu-2,4D) and Cu(C9H7O3Cl2)2.H2O (Cu-2,4DP).Water solubility of synthesized complexes at room temperature was determined. The complexes have been characterized by IR, VIS and EPR spectroscopy, conductivity (in methanol and dimethyloformamide), magnetic measurements and X-ray diffraction analysis. Thermal decomposition of these compounds in air was studied by TG, DTG, DTAand TG/MS methods with simultaneous analysis of the solid and gaseous products.