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International Journal of Analytical Chemistry
Volume 2011 (2011), Article ID 704795, 7 pages
http://dx.doi.org/10.1155/2011/704795
Research Article

Determination of Diethyl Phthalate and Polyhexamethylene Guanidine in Surrogate Alcohol from Russia

1Chemisches und Veterinäruntersuchungsamt (CVUA) Karlsruhe, Weissenburger Straβe 3, 76187 Karlsruhe, Germany
2Department of Chemistry, Saratov State University, Astrakhanskaya Street 83, 410012 Saratov, Russia

Received 28 January 2011; Accepted 17 March 2011

Academic Editor: D. Tsikas

Copyright © 2011 Yulia B. Monakhova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Analytical methods based on spectroscopic techniques were developed and validated for the determination of diethyl phthalate (DEP) and polyhexamethylene guanidine (PHMG), which may occur in unrecorded alcohol. Analysis for PHMG was based on UV-VIS spectrophotometry after derivatization with Eosin Y and 1H NMR spectroscopy of the DMSO extract. Analysis of DEP was performed with direct UV-VIS and 1H NMR methods. Multivariate curve resolution and spectra computation methods were used to confirm the presence of PHMG and DEP in the investigated beverages. Of 22 analysed alcohol samples, two contained DEP or PHMG. 1H NMR analysis also revealed the presence of signals of hawthorn extract in three medicinal alcohols used as surrogate alcohol. The simple and cheap UV-VIS methods can be used for rapid screening of surrogate alcohol samples for impurities, while 1H NMR is recommended for specific confirmatory analysis if required.