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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effect of microwave power on EPR spectra of DOPA-melanin-netilmicin complexes with different drug concentrations : a study at temperatures in the range of 125-275 K
    Autorzy:
    Zdybel, M.
    Pilawa, B.
    Buszman, E.
    Wrześniok, D.
    Krzyminiewski, R.
    Kruczyński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146482.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    DOPA-melanin
    electron paramagnetic resonance (EPR) spectroscopy
    free radicals
    netilmicin
    Opis:
    Electron paramagnetic resonance (EPR) spectra of the model eumelanin – DOPA-melanin complexes with netilmicin measured with a microwave power in the range 0.3–200 mW were examined. The influence of microwave power on amplitudes (A) and linewidths (ΔBpp) of the spectra was determined. The EPR spectra were recorded by a BRUKER spectrometer at temperatures 125, 175, 225 and 275 K. Continuous microwave saturation of EPR lines was used to compare the acceleration of spin-lattice relaxation processes in melanin samples. Changes of the parameters of the EPR spectra of DOPA-melanin-netilmicin complexes, with the microwave power for the samples differing in netilmicin concentrations, were observed. The effect of temperature on the changes of the EPR spectra of the analyzed melanin complexes with the microwave power was determined. The spin-lattice relaxation is faster at higher temperatures for all the tested melanin complexes.
    Źródło:
    Nukleonika; 2013, 58, 3; 407-411
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR studies of free radicals in thermally sterilized famotidine
    Autorzy:
    Ramos, P.
    Pilawa, B.
    Stroka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/148414.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    free radicals
    thermal sterilization
    famotidine
    electron paramagnetic resonance (EPR) spectroscopy
    Opis:
    Free radicals formation in thermally sterilized famotidine was studied by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The influence of temperature and time of sterilization on free radicals generated in famotidine was determined. The best sterilization conditions for the tested drug were found. Sterilization was done according to the pharmaceutical norms at temperatures 160°C (120 min), 170°C (60 min), and 180°C (30 min). It was pointed out that the optimal temperature of thermal sterilization for famotidine was 170°C and time of heating 60 min in this conditions the lowest free radicals concentration was found. The highest free radicals concentration was measured in famotidine heated at 160°C during 120 min, the long time of sterilization is responsible for this effect. Free radicals concentration changes during storage of famotidine after thermal sterilization. Its value increased with storage time for the drug sterilized at both temperatures of 170°C and 180°C. Free radicals concentration decreases from 7 days after sterilization. Complex system of free radicals with the shape of EPR lines, dependent on microwave power exist in thermally sterilized famotidine. Slow spin-lattice relaxation processes, strong dipolar interactions characterize thermally sterilized famotidine. Microwave saturation indicates that EPR lines of famotidine are homogeneously broadened. The usefulness of EPR spectroscopy to examine of the sterilized drugs was evaluated.
    Źródło:
    Nukleonika; 2013, 58, 3; 413-418
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR studies of Cladosporium cladosporioides complexes with amphotericin B
    Autorzy:
    Zdybel, M.
    Pilawa, B.
    Buszman, E.
    Witoszyńska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147790.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amphotericin B
    Cladosporium cladosporioides
    electron paramagnetic resonance (EPR) spectroscopy
    free radicals
    melanin
    Opis:
    Free radicals in Cladosporium cladosporioides cultured with amphotericin B were spectroscopically studied. The effect of drug concentrations on free radicals in the fungal melanin biopolymer was examined. It was pointed out that the concentrations of free radicals in the complexes of Cladosporium cladosporioides mycelium with amphotericin B depend on the drug concentrations. Eumelanin dominates in the fungal studied samples. The slow spin-lattice relaxation processes exist in the tested samples. Free radicals take a part in the formation of Cladosporium cladosporioides mycelium complexes with amphotericin B.
    Źródło:
    Nukleonika; 2013, 58, 3; 401-405
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of oxygen O2 on microwave saturation of EPR lines of plants carbonized at 650°c and potential application in medicine
    Autorzy:
    Pilawa, B.
    Bartłomiejczyk, S.
    Krzesińska, M.
    Pusz, S.
    Zachariasz, J.
    Wałach, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/284844.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    karbonizacja roślin
    elektroniczny rezonans paramagnetyczny
    EPR
    nasycenie mikrofalowe
    centra paramagnetyczne
    oksymetria
    carbonized plants
    electron paramagnetic resonance
    microwave saturation
    paramagnetic centers
    oximetry
    Opis:
    Electron paramagnetic resonance spectroscopy (EPR) was used to examination of spin-lattice relaxation in vascular plants carbonized at 650°C. Application of EPR method of continuous microwave signal saturation in medicine was proposed. The first derivative EPR spectra of pyrolysed bamboo and yucca were measured for samples in air and in vacuum. Influence of microwave power in the range 0.7-100 mW on amplitudes of EPR lines were evaluated. It was stated that amplitudes of the studied carbon materials increase with increasing of microwave power in the studied range. Saturation of EPR lines was not observed, so fast spin-lattice relaxation processes exist in the analyzed materials. Changes of EPR amplitudes for samples in air were slower than for evacuated samples. This effect may be used for determination of oxygen contents in the biological cells cultures and for analysis of optimal parameters of photodynamic therapy of cancer.
    Źródło:
    Engineering of Biomaterials; 2008, 11, 73; 9-11
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparatwe EPR analysis of oxygen interactions with plants carbonized at different temperatures
    Autorzy:
    Bartłomiejczyk, S.
    Pilawa, B.
    Krzesińska, M.
    Pusz, S.
    Zachariasz, J.
    Wałach, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/284848.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    karbonizacja roślin
    centra paramagnetyczne
    paramagnetyczne utlenianie cząsteczek
    elektroniczny rezonans paramagnetyczny
    widma EPR
    oksymetria
    carbonized plants
    paramagnetic centers
    paramagnetic oxygen molecules
    electron paramagnetic resonance
    EPR spectra
    oximetry
    Opis:
    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.
    Źródło:
    Engineering of Biomaterials; 2008, 11, 73; 3-5
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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