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Wyświetlanie 1-3 z 3
Tytuł:
The influence of displacement compounds on the binding of ochratoxin A to human serum albumin examined with fluorescence anisotropy methods
Autorzy:
Wybranowski, T
Ziomkowska, B.
Cwynar, A
Kruszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/173353.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ochratoxin A
binding of drug to albumin
flurbiprofen
ibuprofen
warfarin
Opis:
The subject of the research is the application of the methods of fluorescence anisotropy measurements to study the interaction between human serum albumin (HSA) and toxins and selected medicines (ibuprofen, warfarin, flurbiprofen). Optical spectroscopic methods are useful tools for the study of biologically active compounds. Determining binding intensity of ochratoxin A (OTA) to albumin may be helpful in explaining the effects of toxic influence of OTA. The main factor influencing the distribution of OTA is its affinity for plasma proteins. It was shown that ochratoxin binds strongly to albumin. By the use of the method of fluorescence anisotropy it was proved that the unbound fraction of OTA is higher due to competing interactions with drugs. As a result of separating ochratoxin from protein by competitive compounds, a decrease in the fluorescence anisotropy of the HSA-OTA complex was observed. The largest increase in free fraction of OTA is caused by flurbiprofen, then ibuprofen and warfarin. It will accelerate OTA transport to target organs and shortening its half-life period, leading consequently to a decrease in chronic toxic effects.
Źródło:
Optica Applicata; 2014, 44, 3; 357-364
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Protein-Binding Properties of Camptothecins by Means of Optical Spectroscopy Methods
Autorzy:
Ziomkowska, B.
Cyrankiewicz, M.
Wybranowski, T.
Kruszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1197530.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.K-
87.64.kv
87.15.kp
02.50.Sk
Opis:
Optical spectroscopy methods are widely used in studies of drugs. The affinity of camptothecins - anticancer agents - to human serum albumin (HSA) was determined in this work. Camptothecins (CPTs) exist in two forms: active lactone and open ring inactive carboxylate. In blood, the hydrolysis process of lactone form occurs which leads to deactivation of CPTs. Research is being done on biophysical properties of synthesized CPT compounds, in particular on binding to albumin. The affinity to plasma proteins is an important determinant of stability of CPTs in blood. The following analogues of CPT were tested in this paper: irinotecan, SN-38, topotecan, and 9-amino camptothecin. Using the method of fluorescence anisotropy measurement, the association constants of the studied compounds to HSA were determined. The authors attempted to determine the deactivation rate of topotecan in HSA solution using Principal Component Analysis and Factor Analysis of absorption spectra recorded during hydrolysis process of lactone form.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-61-A-65
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of FITC Fluorescence by Silver Colloids and Silver Island Films
Autorzy:
Kruszewski, S.
Wybranowski, T.
Cyrankiewicz, M.
Ziomkowska, B.
Pawlaczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1812349.pdf
Data publikacji:
2008-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
33.20.Kf
33.50.-j
Opis:
Silver colloids and silver island films as fluorescence enhancement systems are the subject of this paper. Enhancement of fluorescence of molecules placed near metallic nanoparticles is a result of resonance interaction of exciting and emitted lights with surface plasmons. Two models explaining this phenomenon are presented. Processes of silver colloids and silver island films forming are described. Results of extinction, absorption and scattering studies of fluorescence enhancement systems are presented. The influence of these systems, i.e. silver colloids and silver island films on the fluorescence of fluorescein-5-isothiocyanate was studied. 7-fold increase in fluorescence intensity of fluorescein-5-isothiocyanate molecules placed near silver nanoparticles was observed.
Źródło:
Acta Physica Polonica A; 2008, 113, 6; 1599-1608
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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