On-line HPLC 1H NMR coupling for the analysis of fatty alcohol ethoxylates

1997 ◽  
Vol 38 (6) ◽  
pp. 673-679 ◽  
Author(s):  
G. Schlotterbeck ◽  
H. Pasch ◽  
K. Albert
Keyword(s):  
1H Nmr ◽  
Fatty Alcohol ◽  
Alcohol Ethoxylates ◽  
On Line

Aqueous free-radical polymerization of PEGMEMA macromer: kinetic studies via an on-line 1H NMR technique

2012 ◽  
Vol 21 (10) ◽  
pp. 683-688 ◽  
Author(s):  
Vahid Najafi ◽  
Farshid Ziaee ◽  
Kourosh Kabiri ◽  
Mohammad Jalal Zohouriaan Mehr ◽  
Hossein Abdollahi ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
1H Nmr ◽  
Free Radical Polymerization ◽  
Kinetic Studies ◽  
On Line

Determination of fatty alcohol ethoxylates and alkylether sulfates by anionic exchange separation, derivatization with a cyclic anhydride and liquid chromatography

2011 ◽  
Vol 1218 (47) ◽  
pp. 8511-8518 ◽  
Author(s):  
M. Beneito-Cambra ◽  
L. Ripoll-Seguer ◽  
J.M. Herrero-Martínez ◽  
E.F. Simó-Alfonso ◽  
G. Ramis-Ramos
Keyword(s):  
Liquid Chromatography ◽  
Fatty Alcohol ◽  
Alcohol Ethoxylates ◽  
Cyclic Anhydride ◽  
Anionic Exchange

On-line 1H NMR spectroscopic investigation of hydrogen bonding in supercritical and near critical CO2–methanol up to 35MPa and 403K

2007 ◽  
Vol 43 (2) ◽  
pp. 267-275 ◽  
Author(s):  
Michael Maiwald ◽  
Hongping Li ◽  
Thorsten Schnabel ◽  
Kay Braun ◽  
Hans Hasse
Keyword(s):  
Hydrogen Bonding ◽  
1H Nmr ◽  
Spectroscopic Investigation ◽  
On Line

Flow injection analysis with multiple on-line spectroscopic analysis (UV, IR, 1H-NMR and MS)

2002 ◽  
Vol 27 (1-2) ◽  
pp. 191-200 ◽  
Author(s):  
Eva Lenz ◽  
Steve Taylor ◽  
Craig Collins ◽  
Ian D Wilson ◽  
Dave Louden ◽  
...  
Keyword(s):  
1H Nmr ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Spectroscopic Analysis ◽  
On Line

Acute toxicity and relationship between metabolites and ecotoxicity during the biodegradation process of non-ionic surfactants: fatty-alcohol ethoxylates, nonylphenol polyethoxylate and alkylpolyglucosides

2009 ◽  
Vol 59 (12) ◽  
pp. 2351-2358 ◽  
Author(s):  
E. Jurado ◽  
M. Fernández-Serrano ◽  
J. Núñez-Olea ◽  
G. Luzón ◽  
M. Lechuga
Keyword(s):  
Chain Length ◽  
Fatty Alcohol ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Alcohol Ethoxylates ◽  
Ionic Surfactants ◽  
Luminescent Bacteria ◽  
Hydrophilic Lipophilic Balance ◽  
Biodegradation Process ◽  
Nonylphenol Polyethoxylate

The toxicity values of fatty-alcohol ethoxylates, nonylphenol polyethoxylate, and alkylpolyglucosides have been determined by applying assays with luminescent bacteria. Also, the relation between metabolites and ecotoxicity during the biodegradation process has been determined. The biodegradation tests were carried out according to the OECD 301 E test for ready biodegradability. In these tests a solution of the surfactant, representing the sole carbon source for the microorganisms, was tested in a mineral medium, inoculated and incubated under aerobic conditions in the dark. The toxicity of surfactants is related to their molecular structure (Quantitative Structure Activity Relationships, QSAR). For the alkylpolyglucosides, toxicity expressed as EC50 is related with the critical micelle concentration (CMC), the hydrophilic-lipophilic balance (HLB) of the surfactant, and the hydrophobic alkyl chain (R). The results indicate that toxicity increased as the CMC decreased and as the hydrophobicity increased and R rose. For fatty-alcohol ethoxylates, parameters characteristic studied have been HLB, number of units of ethylene oxide and the alkyl chain length. Relationships found are in agreement with the fact that increasing the alkyl chain length leads to a lower EC50, whereas increasing ethoxylation leads to a lower toxicity. An analysis of the behaviour of the toxicity and HLB again indicates that the toxicity was greater for surfactants with a smaller HLB. The evolution of the toxicity was studied over the biodegradation process, expressed as a percentage of inhibition. For all the non-ionic surfactants assayed, except for the nonylphenol polyethoxylate, a major decline was found in toxicity during the first days of the biodegradation assay and at all the concentrations tested.

1H-NMR on line monitoring of water activity during lipase catalysed esterification

1998 ◽  
Vol 1387 (1-2) ◽  
pp. 129-135 ◽  
Author(s):  
Benoît Decagny ◽  
Corinne Roblot ◽  
Françoise Ergan ◽  
Catherine Sarazin ◽  
Jean-Noël Barbotin ◽  
...  
Keyword(s):  
Water Activity ◽  
1H Nmr ◽  
On Line

Two‐dimensional chromatography of complex polymers, 8. Separation of fatty alcohol ethoxylates simultaneously by end group and chain length

2010 ◽  
Vol 33 (10) ◽  
pp. 1375-1381 ◽  
Author(s):  
Jacques‐Antoine Raust ◽  
Adele Bruell ◽  
Pritish Sinha ◽  
Wolf Hiller ◽  
Harald Pasch
Keyword(s):  
Chain Length ◽  
Fatty Alcohol ◽  
Alcohol Ethoxylates ◽  
Two Dimensional ◽  
Complex Polymers ◽  
End Group
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