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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > October  >
In the Laboratory
The Quantitative Determination of Butylated Hydroxytoluene in Chewing Gum Using GC–MS
A. E. Witter
Department of Chemistry, Dickinson College, Carlisle, PA 17013
Cover
October 2005
Vol. 82 No. 10
p. 1538
Abstract
An undergraduate experiment for the quantitative determination of the synthetic antioxidant butylated hydroxytoluene (BHT) in chewing gum is described. A simple extraction procedure was used that did not require sample derivatization for analysis. Gum samples were ground in a coffee grinder into a free-flowing powder. The internal standard 3,5-di-tert-butylphenol, was added and the ground samples were extracted in acetonitrile. The BHT-containing extract was concentrated using rotary evaporation and resuspended in ethyl acetate. Butylated hydroxyanisole (BHA) was added as a recovery surrogate, and gas chromatography-mass spectrometry with selected-ion monitoring (SIM) was used to identify and quantify BHT. Butylated hydroxytoluene recoveries from the chewing gum matrix were typically > 80%, and student results (42-172 mg BHT per g gum) agreed closely with BHT concentrations determined in other studies (50-200 mg BHT per g gum).
Supplement
Instructions for the students, notes for the instructor, and a typical set of data are available.
*  Contents JCE2005p1538W.doc (Microsoft Word)
*  Download
JCE2005p1538W.pdf

JCE2005p1538W.zip
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*  Citation
 Witter, A. E. J. Chem. Educ. 2005 82 1538.
*  Keywords
 Analytical Chemistry; Aromatic Compounds; Chromatography; Consumer Chemistry; Food Science; Free Radicals; Hands-On Learning / Manipulatives; Instrumental Methods; Laboratory Instruction; Mass Spectrometry; Quantitative Analysis; Second-Year Undergraduate; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 August 30, 2005
September 8, 2005
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