Document Detail

Separation of fatty alcohol ethoxylates by capillary zone electrophoresis and micellar electrokinetic chromatography.
MedLine Citation:
PMID:  19142913     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Separation methods based on capillary zone electrophoresis and micellar electrokinetic chromatography were developed to characterize the distribution of ethylene oxide (EO) homologues in the fatty alcohol ethoxylates (FAEs). Prior to the separation, the FAEs were derivatized with 2-fluoro-1-methylpyridinium p-toluenesulfonate (FMPTS) to allow CZE separation and UV detection. To prevent adsorption of cationic analytes onto the inner surface of the capillary and formation of micelles in CZE analysis, a lower pH background solution (BGS) containing a high concentration of acetonitrile was employed. Under optimal conditions, FMPTS-derivatized FAEs with an average EO number of 6 were completely separated within 11 min. For MEKC analysis of the FAEs, dodecyltrimethylammonium chloride (DTAC) was added to the BGS. In the presence of 30 mM DTAC in 10 mM phosphate buffer (pH 2.5) containing 20% (v/v) acetonitrile, superior oligomer separation of the FAEs containing up to 50 EO groups was achieved within 30 min with good analytical reproducibilities. Furthermore, the developed method was applied to the analysis of the FAEs in commercial products such as laundry detergent and fabric softener.
Ryo Koike; Fumihiko Kitagawa; Koji Otsuka
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of separation science     Volume:  32     ISSN:  1615-9314     ISO Abbreviation:  J Sep Sci     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-02-02     Completed Date:  2009-04-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088554     Medline TA:  J Sep Sci     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  399-407     Citation Subset:  -    
Department of MaterialChemistry, Graduate School ofEngineering, Kyoto University, Kyoto, Japan.
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