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Titolo:
Characterization of jeffamines by capillary isotachophoresis and zone electrophoresis
Autore:
Beckers, JL; Verheggen, TPEM; Triepels, HJP; Everaerts, FM;
Indirizzi:
Eindhovenlands Technol, Instrumental Anal Lab, NL-5600 MB Eindhoven, Nether Eindhoven Univ Technol Eindhoven Netherlands NL-5600 MB indhoven, Nether
Titolo Testata:
JOURNAL OF CHROMATOGRAPHY A
fascicolo: 1-2, volume: 838, anno: 1999,
pagine: 149 - 155
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESPONSE FACTOR;
Keywords:
isotachophoresis; molecular mass determination; jeffamines; amines;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Beckers, JL Eindhovenn,niv Technol, Instrumental Anal Lab, POB 513, NL-5600 MB Eindhove Eindhoven Univ Technol POB 513 Eindhoven Netherlands NL-5600MB
Citazione:
J.L. Beckers et al., "Characterization of jeffamines by capillary isotachophoresis and zone electrophoresis", J CHROMAT A, 838(1-2), 1999, pp. 149-155

Abstract

Isotachophoresis has the unique feature that both qualitative and quantitative information can be deduced from step heights in isotachopherograms, even for unknown ionic species. For strong cations and anions there exists a linear relationship between, respectively, the measured step heights and the response factor (RF) versus the specific zone resistance at 25 degrees C (SZR(25)) for a specific leading electrolyte. Applying two standard components, e.g., the leading ion and Na+, the relationship between measured step heights and the SZR(25) values can be set up and from the step heights of the sample ionic species in the isotachopherograms the SZR(25) values can beobtained. With these values all other parameters such as the mobilities, me concentrations in the zones and the RF values can be calculated. In combination with the measured zone lengths, the molar fractions and mass fractions can be calculated. Tn this way, the number-average and weight-average molecular masses can be obtained for homologous series of anions/cations fromthe isotachopherograms of the mixtures. This procedure is applied to jeffamines D230 and D400 and the obtained molecular masses are comparable with the labelled values. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 26/09/20 alle ore 02:27:53