Analysis of ethoxylated fatty amines. Comparison of methods for the determination of molecular weight
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Specific lengths of the fatty and polyoxyethylene chains of ethoxylated fatty amines are critical to their performance in specific applications, and thus the ability to characterize these surfactants accurately is crucial. Normal-phase high-performance liquid chromatography (HPLC) and matrixassisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry methods were developed to determine with accuracy the molecular weight and degree of ethoxylation of ethoxylated fatty amines. Ethoxylated fatty amines were analyzed using these methods, and comparison was made to molecular weight determinations using proton nuclear magnetic resonance (NMR), neutralization equivalent weight, and hydroxyl value methods. Molecular weight results from normalphase HPLC analyses were in very good agreement with MALDI-TOF results, typically varying less than one ethylene oxide unit. A reversed-phase HPLC method was developed to determine concentrations of polyethylene glycols (PEG) and fatty homologs. PEG interfered with molecular weight determinations by NMR, neutralization equivalent weight, and hydroxyl value methods. PEG caused no interference with molecular weight determinations by normal-phase HPLC and MALDI-TOF methods.
- Reck, R., Cationic Surfactants Derived from Nitriles, in Cationic Surfactants, edited by J. Richmond, Surfactant Science Series, Marcel Dekker, Inc., New York, 1990, Vol. 34, p. 163.
- Cegarra, J., J. Valldeperas, J. Navarro, and A. Navarro, Influence of Oxyethylenated Alkylamines in the Dyeing of Wool, J. Soc. Dyers Colour 99:291 (1983).
- Tsatsaroni, E., I. Eleftheriadis, and A. Kehayoglou, The Role of Polyoxyethylenated Stearylamines in the Dyeing of Cotton with Direct Dyes, ——Ibid. 106:245 (1990). CrossRef
- Arif, S., Fatty Amine Ethoxylates, HAPPI, 67 (1996).
- Cross, J., Introduction to Nonionic Surfactants, in Nonionic Surfactants, edited by J. Cross, Surfactant Science Series, Marcel Dekker, Inc., New York, 1987, Vol. 19, p. 3.
- Miwidsky, B.M., and D.M. Gabriel, Detergent Analysis, 1982, John Wiley & Sons, New York, pp. 207–208.
- Cross, J., Aspects of Quality and Process Control, in Nonionic Surfactants, edited by J. Cross Surfactant Science Series, Marcel Dekker, Inc., New York, 1987, Vol. 19, p. 371.
- Marquez, N., R. Anton, A. Usubillaga, and J.L. Salager, Optimization of HPLC Conditions to Analyze Widely Distributed Ethoxylated Alkylphenol Surfactants, J. Liquid Chromatogr. 17:1147 (1994).
- Miszkiewicz, W., and L. Szymanowski, Analysis of Nonionic Surfactants with Polyoxyethylene Chains by High-Performance Liquid Chromatography, Crit. Rev. Anal. Chem. 25:203 (1996).
- Ban, T., E. Papp, and J. Inczedy, Reversed-Phase High-Performance Liquid Chromatography of Anionic and Ethoxylated Non-Ionic Surfactants and Pesticides in Liquid Pesticide Formulations. J. Chromatogr. 593:227 (1992). CrossRef
- Zeman, I., J. Silha, and M. Bares, Separation of Ethoxylates by HPLC, Tenside Deterg. 23:181 (1986).
- Schreuder, R., A. Martin, H. Poppe, and J.C. Kraak, Determination of the Composition of Ethoxylated Alkylamines in Pesticide Formulations by High-Performance Liquid Chromatography Using Ion-Pair Extraction Detection. J. Chromatogr. 368:339 (1986). CrossRef
- Martin, N., Analysis of Non-Ionic Surfactants by HPLC Using Evaporative Light-Scattering Detector. J. Liquid Chromatogr. 18:1173 (1995).
- Bahr, U., A. Deppe, M. Karas, F. Hillenkamp, and U. Geissmann, Mass Spectrometry of Synthetic Polymers by UV-Matrix-Assisted Laser Desorption/Ionization, Anal. Chem. 64:2866 (1992). CrossRef
- Thomson, B., Z. Wang, A. Paine, A. Rudin, and G., Lajoe, Surfactant Analysis by Matrix-Assisted Laser Desorption Time-of-Flight Mass Spectrometry. J. Am. Oil Chem. Soc. 72:11 (1995).
- Montaudo, G., M. Montaudo, C. Puglisi, and F. Samperi, Characterization of Polymers by Matrix Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry: Molecular Weight Estimates in Samples of Varying Polydispersity. Rapid Commun. Mass Spectrom. 9:453 (1995). CrossRef
- Bartsch, H., M. Strabner, and U. Hintze, Characterization and Identification of Ethoxylated Surfactants by Matrix-Assisted Laser Desoption/Ionization Mass Spectrometry, Tenside Surf. Det. 35:94 (1998).
- Wu, K., and R. Odom, Characterizing Synthetic Polymers by MALDI MS, Anal. Chem. 70:456A (1998).
- Montana, A., Nuclear Magnetic Resonance Spectrometry of Nonionic Surfactants, in Nonionic Surfactants, edited by J. Cross, Surfactant Science Series, Vol. 19, Marcel Dekker, Inc., New York, 1987, p. 295.
- AOCS Hydroxyl Value Determination, Official and Recommended Practices of the American Oil Chemists' Society, AOCS Press, Champaign, 1993, Method Cd 13–60.
- Snyder, L., J. Glajch, and J. Kirkland, Practical HPLC Method Development, John Wiley & Sons, New York, 1988, pp. 60, 61.
- Dreux, M., M. Lafosse, and L. Morin-Allory, The Evaporative Light Scattering Detector-A Universal Instrument for Non-Volatile Solutes in LC and SFC, LCGC International 14:148 (1996).
- Analysis of ethoxylated fatty amines. Comparison of methods for the determination of molecular weight
Journal of Surfactants and Detergents
Volume 2, Issue 4 , pp 503-513
- Cover Date
- Print ISSN
- Online ISSN
- Additional Links
- Degree of ethoxylation
- ethoxylated fatty amines
- hydroxyl value
- molecular weight
- neutralization equivalent weight
- H NMR
- Industry Sectors