Journal of Surfactants and Detergents

, Volume 7, Issue 2, pp 195–202

Characterization of alcohol ethoxylates as alcohol ethoxy sulfate derivatives by liquid chromatography-Mass spectrometry

  • Giorgio Cassani
  • Claudio Pratesi
  • Lorella Faccetti
  • Stefano Pravettoni
  • Giancarlo Nucci
  • Nunzio Andriollo
  • Luigi Valtorta
  • Lee Matheson
Article

DOI: 10.1007/s11743-004-0304-z

Cite this article as:
Cassani, G., Pratesi, C., Faccetti, L. et al. J Surfact Deterg (2004) 7: 195. doi:10.1007/s11743-004-0304-z

Abstract

The characterization of alcohol ethoxylates (AE) to determine ethylene oxide (EO) adduct distribution has been studied in our laboratory for many years by using high-performance liquid chromatography-mass spectrometry (LC-MS). This paper describes the LC-MS approach being used to analyze both nonderivatized and derivatized AE. We conclude that the best way to determine EO adduct distribution is by first converting the AE to alcohol ethoxy sulfates (AES) and then by using LC-MS with electrospray ionization in the negative ion mode. A convenient laboratory technique for converting small-scale samples of AE to AES has been discovered and is reported herein. Several examples of EO adduct distribution determined by this method are presented for both linear and isomeric AE samples.

Key Words

AEAESalcohol ethoxy sulfatesalcohol ethoxylatesalcohol ether sulfatesanalysisanionic surfactantsLC-MS mass spectrometrynonionic surfactants

Abbreviations

AE

alcohol ethoxylates

AES

alcohol ethoxy (or ethoxylated or ether) sulfates

APGI

atmospheric pressure chemical ionization

AS

alcohol sulfates

ESI

electrospray ionization

EO

ethylene oxide

GC-MS

gas chromatography-mass spectrometry

HPLC

high-performance liquid chromatography

LC-MS

liquid chromatography-mass spectrometry

LOD

limit(s) of detection

SO3-DMF

sulfur trioxide dimethylformamide

Copyright information

© AOCS Press 2004

Authors and Affiliations

  • Giorgio Cassani
    • 1
  • Claudio Pratesi
    • 1
  • Lorella Faccetti
    • 1
  • Stefano Pravettoni
    • 1
  • Giancarlo Nucci
    • 1
  • Nunzio Andriollo
    • 1
  • Luigi Valtorta
    • 1
  • Lee Matheson
    • 2
  1. 1.Sasol Italy S.p.A. Research & TechnologyPaderno Dugnano(MI)Italy
  2. 2.Sasol North America Inc.Austin