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Statements

Subject Item
n2:RIV%2F62156489%3A43210%2F04%3A00000829%21RIV%2F2005%2FMSM%2F432105%2FN
rdf:type
skos:Concept n18:Vysledek
dcterms:description
Capillary zone electrophoresis with UV detection was used for determination of dissociation constants of alkaloids sanguinarine and chelerythrine. Despite the limited solubility of the uncharged forms of the alkaloids resulting in insufficient analytical signal at higher pH the reliable dissociation constants were obtained when acidified samples containing low amount of the alkaloid were injected into the capillary. The precipitation of the alkaloid in the capillary induced by injecting sample of low pH into the background electrolyte of higher pH does not affect the mobility of the alkaloid if its concentration injected exceeds the solubility only to a small extent. Dissociation constants (pKR+) of sanguinarine and chelerythrine calculated to 8.3 +- 0.1 and 9.2 +- 0.1, respectively, are relevant to Good buffers of ionic strength of 30 mM. Capillary zone electrophoresis with UV detection was used for determination of dissociation constants of alkaloids sanguinarine and chelerythrine. Despite the limited solubility of the uncharged forms of the alkaloids resulting in insufficient analytical signal at higher pH the reliable dissociation constants were obtained when acidified samples containing low amount of the alkaloid were injected into the capillary. The precipitation of the alkaloid in the capillary induced by injecting sample of low pH into the background electrolyte of higher pH does not affect the mobility of the alkaloid if its concentration injected exceeds the solubility only to a small extent. Dissociation constants (pKR+) of sanguinarine and chelerythrine calculated to 8.3 +- 0.1 and 9.2 +- 0.1, respectively, are relevant to Good buffers of ionic strength of 30 mM. Capillary zone electrophoresis with UV detection was used for determination of dissociation constants of alkaloids sanguinarine and chelerythrine. Despite the limited solubility of the uncharged forms of the alkaloids resulting in insufficient analytical signal at higher pH the reliable dissociation constants were obtained when acidified samples containing low amount of the alkaloid were injected into the capillary. The precipitation of the alkaloid in the capillary induced by injecting sample of low pH into the background electrolyte of higher pH does not affect the mobility of the alkaloid if its concentration injected exceeds the solubility only to a small extent. Dissociation constants (pKR+) of sanguinarine and chelerythrine calculated to 8.3 +- 0.1 and 9.2 +- 0.1, respectively, are relevant to Good buffers of ionic strength of 30 mM.
dcterms:title
Capillary Electrophoretic Studies of Acid-Base Properties of Sanguinarine and Chelerythrine Alkaloids. CE stanovení disociačních konstant Capillary Electrophoretic Studies of Acid-Base Properties of Sanguinarine and Chelerythrine Alkaloids.
skos:prefLabel
Capillary Electrophoretic Studies of Acid-Base Properties of Sanguinarine and Chelerythrine Alkaloids. Capillary Electrophoretic Studies of Acid-Base Properties of Sanguinarine and Chelerythrine Alkaloids. CE stanovení disociačních konstant
skos:notation
RIV/62156489:43210/04:00000829!RIV/2005/MSM/432105/N
n4:strany
141;145
n4:aktivita
n12:Z
n4:aktivity
Z(MSM 432100001)
n4:cisloPeriodika
1
n4:dodaniDat
n10:2005
n4:domaciTvurceVysledku
n14:1150936 n14:3985288
n4:druhVysledku
n8:J
n4:duvernostUdaju
n15:S
n4:entitaPredkladatele
n16:predkladatel
n4:idSjednocenehoVysledku
556821
n4:idVysledku
RIV/62156489:43210/04:00000829
n4:jazykVysledku
n9:eng
n4:klicovaSlova
alkaloids;capillary electrophoresis;dissociation constants
n4:klicoveSlovo
n7:dissociation%20constants n7:capillary%20electrophoresis n7:alkaloids
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[57458D3B2876]
n4:nazevZdroje
Journal of Chromatography A
n4:obor
n17:CB
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
3
n4:rokUplatneniVysledku
n10:2004
n4:svazekPeriodika
1040
n4:tvurceVysledku
Barták, Jiří Vlčková, Markéta Kubáň, Vlastimil
n4:zamer
n13:MSM%20432100001
s:issn
0021-9673
s:numberOfPages
5
n11:organizacniJednotka
43210