MOLECULAR WEIGHT OF POLYETHER SURFACTANTS 163 trometer interface is the simplest most direct way to separate and analyze a complex mixture, although gas chromatography-mass spectroscopy interface instruments are still beyond the budgetary capability of most laboratories. However, most laboratories own or have easy access to a nuclear magnetic resonance spectrometer and have some facilities for chromatographic separation on a preparative scale. These may include preparative gas chromatography, thin-layer, or column chromatography. If one separates and collects fractions of a mixture, the fractions can be derivatized such as by acetylation on the terminal hydroxyl group. One now has a handle, which is easily located in the NMR spectrum and whose signal strength remains constant over all components of the mix- ture. One can then easily compare its signal to the signals which in- crease with increasing chain length. For polyether surfactants of molecular weight up to about 1200, this is a simple way of determining the chain length of any fraction. This information combined with the chromatographic separation data should give a complete molecular weight distribution. ACKNOWLEDGMENT The authors would like to thank Messrs. T. Karalis and K. Longley of Witco Chemical Co. for supplying the tertiary amine and Dr. M. Schulman of Varian Aerograph Co. for carrying out and interpreting the mass spectra. (Received October 5, 1971) REFERENCES (1) Gildenberg, L., and Trowbridge, J. R., Gas-liquid chromatographic separation of ethyl- ene oxide adducts of fatty alcohols via their acetate esters, J. Amer. Oil Chem. Soc., 42, 69-71 (1965). (2) Calzolari, C., Stancher, B., and Favretto, L., Molecular weight fractionation of poly- ethylene glycol by gas chromatography, J. Chromatogr., !18, 7-17 (1968). (3) Withers, M. K., The gas chromatography of polyethers, J. Gas Chromatogr., 6, 242-4 (1968). (4) Ludwig, F. J., St., Analysis of ethylene oxide and propylene oxide adducts of alkylphenols or alcohols by nuclear magnetic resonance, gas-liquid chromatography, and thin-layer chromatography procedures, Anal. Chem., 40• 1620-7 (1968). (5) Determann, H., Gel Chromatography, Springer-Verlag, New York, N.Y., 1968.

164 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Society of Cosmetic Chemists Award Sponsored by International Flavors and Fragrances, Inc. The 1970 Society of Cosmetic Chemists Award sponsored by Interna- tional Flavors and Fragrances, Inc., has been presented to Dr. Francis N. Marzulli of the Food and Drug Administration and to Dr. Howard I. Maibach of the University of California, San Francisco Medical Center, for their paper "Perfume Phototoxicity." The award, consisting of a scroll and a $1000 honorarium, is presented annually to the author or authors of the most meritorious paper pub- lished in the Jotmr•^•. oF TI-IF. Soc•F.•-¾ oF CosMF. vm CHEM•SVS, USA. Formal presentation was made by the Society's President, Mr. Morris Root, at the December 13th luncheon session during the Society's annual meeting in New York City. LeJt to right: Dr. Howard I. Maibach, Dr. Francis N. Marzulli, and Mr. M,orris P•oot, Presi- dent of the Society