Document Detail

Characterization of PEG in monomethyl ethers of PEG by 2-D LC.
MedLine Citation:
PMID:  20235138     Owner:  NLM     Status:  MEDLINE    
PEGs present in samples of the corresponding monomethyl ethers are analyzed by 2-D LC with LC at critical conditions as the first and liquid adsorption chromatography as the second dimension. The fractions from the first dimension are transferred to the second one by heart-cutting using a ten-port valve. The efficiency of the separation is dramatically improved by adding water to the eluate from the first dimension before the switching valve in order to have a weaker eluent in the fraction than that of the second dimension. By this procedure, the fractions are focussed and reconcentrated. The molar mass distribution of the PEG fraction can be determined with good accuracy even at very low amounts of PEG in the PEG-monomethyl ethers (down to 0.5%).
Hasnat Ahmed; Bernd Trathnigg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of separation science     Volume:  33     ISSN:  1615-9314     ISO Abbreviation:  J Sep Sci     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-25     Completed Date:  2010-09-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088554     Medline TA:  J Sep Sci     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1448-53     Citation Subset:  IM    
NAWI Graz, Central Polymer Laboratories (CePoL), Institute of Chemistry, Karl-Franzens-University, Graz, Austria.
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MeSH Terms
Chromatography, Liquid / methods*
Methyl Ethers / chemistry*
Polyethylene Glycols / analysis*,  chemistry*
Reg. No./Substance:
0/Methyl Ethers; 0/Polyethylene Glycols

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