Protonaní/deprotonaní rovnováhy thymidinu a azidothymidinu studované pomocí UV spektrometrie a chemometrie

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F04%3A00011238" target="_blank" >RIV/00216224:14310/04:00011238 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The protonation/deprotonation equilibrium of thymidine and azidothymidine studied by UV spectra and multivariate curve resolution

Popis výsledku v původním jazyce

The aim of our work was to study of protonation/deprotonation equilibrium of AZT and AZU in aqueous solutions with different concentrations of NaCl by using UV spectra connected with chemometrics. Calibration and correct function of pH meter (electrode)was performed by acido-basic potenciometric titration (HCl and NaOH), of which parameters were calculated by means of GranLs method. Correct way how to determine ionization constants was verified using thymidine and uridine for which the pKa value was known. The absorption spectra were measured from 240 to 320 nm at temperature 25C and various ionic strength from 0.05M to 0.25M. The absorption maxima of thymidine and AZT are very close and have values of 267 and 266.5 nm for pH 8, respectively. The wavelength of maxima of uridine and AZU were identical 262nm, but the absorbance of AZU has hypochromical shift. Firstly, from non-smoothed spectra the system of matrices (É, A.U., pH) was made (Fig. a), that were the input data for Multivari

Název v anglickém jazyce

The protonation/deprotonation equilibrium of thymidine and azidothymidine studied by UV spectra and multivariate curve resolution

Popis výsledku anglicky

The aim of our work was to study of protonation/deprotonation equilibrium of AZT and AZU in aqueous solutions with different concentrations of NaCl by using UV spectra connected with chemometrics. Calibration and correct function of pH meter (electrode)was performed by acido-basic potenciometric titration (HCl and NaOH), of which parameters were calculated by means of GranLs method. Correct way how to determine ionization constants was verified using thymidine and uridine for which the pKa value was known. The absorption spectra were measured from 240 to 320 nm at temperature 25C and various ionic strength from 0.05M to 0.25M. The absorption maxima of thymidine and AZT are very close and have values of 267 and 266.5 nm for pH 8, respectively. The wavelength of maxima of uridine and AZU were identical 262nm, but the absorbance of AZU has hypochromical shift. Firstly, from non-smoothed spectra the system of matrices (É, A.U., pH) was made (Fig. a), that were the input data for Multivari

Druh

D - Stať ve sborníku

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2004

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

sborn&iacute;k- XLVII Zjazd PTchem i SITPChem Wroclaw 2004

ISBN

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ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

1232

Název nakladatele

Polskie Towarystwo Chemiczne

Místo vydání

Wroclaw, Polsko,2004

Místo konání akce

Wroclaw, Polsko

Datum konání akce

12. 9. 2004

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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