About: Spectrophotometric study of time stability and acid-base characteristics of chelerythrine and dihydrochelerythrine

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About: Spectrophotometric study of time stability and acid-base characteristics of chelerythrine and dihydrochelerythrine Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Time stability, acid-base and UV-VIS spectral properties of dihydrochelerythrine (DHCHE) were studied spectrophotometrically in water: methanol and water: ethanol media. DHCHE is stable in strongly acid milieu (pH < 3) and at the higher amounts (60% v/v) alcohol. Acid-base characteristics and UV-VIS spectral properties of chelerythrine (CHE) were studied in aqueous solutions in the presence of different concentrations of HCl, HNO(3), H(2)SO(4), H(3)PO(4) and their mixtures. Remarkable shifts of formation parts of absorbance-pH (A-pH) curves to the alkaline medium were observed depending on the type and concentration of inert electrolyte (most remarkable for HNO(3) and HCl). The corresponding equilibrium constants pK(R+) of the transition reaction between charged iminium Q(+) and uncharged QOH (pseudo-base, 6-hydroxy-dihydro derivative) forms of chelerythine were calculated using a numerical interpretation of A-pH curves by a SQUAD-G computer program which ranged from 8.51-9.31. Time stability, acid-base and UV-VIS spectral properties of dihydrochelerythrine (DHCHE) were studied spectrophotometrically in water: methanol and water: ethanol media. DHCHE is stable in strongly acid milieu (pH < 3) and at the higher amounts (60% v/v) alcohol. Acid-base characteristics and UV-VIS spectral properties of chelerythrine (CHE) were studied in aqueous solutions in the presence of different concentrations of HCl, HNO(3), H(2)SO(4), H(3)PO(4) and their mixtures. Remarkable shifts of formation parts of absorbance-pH (A-pH) curves to the alkaline medium were observed depending on the type and concentration of inert electrolyte (most remarkable for HNO(3) and HCl). The corresponding equilibrium constants pK(R+) of the transition reaction between charged iminium Q(+) and uncharged QOH (pseudo-base, 6-hydroxy-dihydro derivative) forms of chelerythine were calculated using a numerical interpretation of A-pH curves by a SQUAD-G computer program which ranged from 8.51-9.31. (en)
Title	Spectrophotometric study of time stability and acid-base characteristics of chelerythrine and dihydrochelerythrine Spectrophotometric study of time stability and acid-base characteristics of chelerythrine and dihydrochelerythrine (en)
skos:prefLabel	Spectrophotometric study of time stability and acid-base characteristics of chelerythrine and dihydrochelerythrine Spectrophotometric study of time stability and acid-base characteristics of chelerythrine and dihydrochelerythrine (en)
skos:notation	RIV/00216224:14410/10:00063961!RIV13-MSM-14410___
http://linked.open...avai/riv/aktivita	I P V
http://linked.open...avai/riv/aktivity	I, P(GA525/07/0871), V
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Kubáň, Vlastimil Jančář, Luděk
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Pedagogická fakulta
http://linked.open...dnocenehoVysledku	289149
http://linked.open...ai/riv/idVysledku	RIV/00216224:14410/10:00063961
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Chelerythrine; Dihydrochelerythrine; Time stability; UV-VIS spectral characteristics; Equilibrium constants (en)
http://linked.open.../riv/klicoveSlovo	Dihydrochelerythrine Equilibrium constants Time stability UV-VIS spectral characteristics Chelerythrine
http://linked.open...odStatuVydavatele	PL - Polská republika
http://linked.open...ontrolniKodProRIV	[6E8FB0B753A6]
http://linked.open...i/riv/nazevZdroje	Central European Journal of Chemistry
http://linked.open...in/vavai/riv/obor	CB
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Detoxification of quaternary isoquinoline alkaloids in vitro and in vivo, biological activity of their metabolites
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	8
http://linked.open...iv/tvurceVysledku	Kubáň, Vlastimil Jančář, Luděk Jančářová, Irena Absolínová, Helena Vicar, Jaroslav
http://linked.open...ain/vavai/riv/wos	000277021300020
issn	1895-1066
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.2478/s11532-010-0038-7
http://localhost/t...ganizacniJednotka	14410

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