Single-pump bi-dimensional LC applied to the characterization of derivatized fatty alcohol ethoxylates
A column selection valve and a 6-port 2-position injection valve were combined to implement bi-dimensional LC in a system driven by a single pump. The system was applied to the separation of linear fatty alcohol ethoxylates with 12-18 carbon atoms in the hydrocarbon moiety, previous derivatization w...
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Published in | Journal of separation science Vol. 33; no. 10; pp. 1398 - 1404 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
Wiley-VCH Verlag
01.06.2010
WILEY-VCH Verlag WILEY‐VCH Verlag |
Subjects | |
Online Access | Get full text |
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Summary: | A column selection valve and a 6-port 2-position injection valve were combined to implement bi-dimensional LC in a system driven by a single pump. The system was applied to the separation of linear fatty alcohol ethoxylates with 12-18 carbon atoms in the hydrocarbon moiety, previous derivatization with diphenic anhydride. Separation on the first separation dimension (C₁) was carried out with a propyl-diol column and an acetonitrile/aqueous ammonium acetate gradient. Fatty alcohol ethoxylate hydrocarbon series (oligomers with the same number of carbon atoms in the alkyl chain but differing in the number of ethylene oxide units) were resolved without distinguishing the oligomers within the series. Selected segments of the eluate of C₁ were transferred to the second column (C₂), where the successive oligomers within the isolated series were resolved by using either an octyl-silica or a pentafluoro-phenyl-propyl column and an acetonitrile/water gradient. Flow stopping at C₁ during system re-conditioning and elution along the second dimension did not produce any noticeable band broadening. Overlapping of the non-ethoxylated and mono-ethoxylated oligomers with other oligomers within the series was avoided by eluting the pentafluoro-phenyl-propyl column at low temperatures (3°C). |
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Bibliography: | http://dx.doi.org/10.1002/jssc.200900723 ark:/67375/WNG-2VN4TT50-Q istex:600F8ADE23918658527D871FDECA7C5C78E5F56C "Fondo Europeo de Desarrollo Regional" of the European Union - No. CTQ2007-61445/BQU "Químicas Oro" (San Antonio de Benagéber, Valencia, Spain) "Ministerio de Educación y Ciencia" of Spain ArticleID:JSSC200900723 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 1615-9306 1615-9314 |
DOI: | 10.1002/jssc.200900723 |