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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > July  >
In the Laboratory
Measuring Gas-Phase Basicities of Amino Acids Using an Ion Trap Mass Spectrometer. A Physical Chemistry Laboratory Experiment
Lee S. Sunderlin, Victor Ryzhov, Lanea M. M. Keller, and Elizabeth R. Gaillard
Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115
Cover
July 2005
Vol. 82 No. 7
p. 1071
Abstract
A new experiment for the undergraduate physical chemistry laboratory has been developed that uses an ion trap mass spectrometer to measure the relative gas-phase basicities of amino acids. This experiment is based on the kinetic method, which connects kinetics measurements on two competing reaction rates to the thermodynamic properties of the reaction products. This method gives high precision (typically 2 kJ mol–1) on properties that are difficult to measure through other means. The experiment also introduces students to an active area of research in mass spectrometry and demonstrates the application of physical chemistry techniques to biochemistry.
Supplement
Instructions for the students, including a description of mass spectrometry, the kinetic method, and amino acids; questions and answers for a discussion of the lab; a computational chemistry supplement to the lab; procedure to use the MS; and notes for the instructor are available.
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*  Citation
 Sunderlin, Lee S.; Ryzhov, Victor; Keller, Lanea M. M.; Gaillard, Elizabeth R. J. Chem. Educ. 2005 82 1071.
*  Keywords
 Amino Acids; Hands-On Learning / Manipulatives; Kinetics; Laboratory Instruction; Mass Spectrometry; Physical Chemistry; Thermodynamics; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 May 31, 2005
June 8, 2005
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