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Micelle-catalyzed reaction of ninhydrin with DL-valine in the absence and presence of organic solvents

✍ Scribed by Kabir-ud-Din; Waseefa Fatma; Zaheer Khan

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
246 KB
Volume
38
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

Kinetics of the DL‐valine‐ninhydrin reaction has been studied spectrophotometrically under varying conditions of [CTAB], [ninhydrin], [DL‐valine], pH, temperature, and %(v/v) organic solvents (solvents used: 1‐propanol, methylcellosolve, acetonitrile, and dimethyl sulfoxide). Addition of CTAB and increase in the proportion of organic solvents, both showed catalyzing effect on the reaction. The effect of simultaneous presence of CTAB and DMSO in the reaction mixture has also been seen. The rate profiles obtained for solutions containing from 10% to 70% DMSO exhibited clear maxima that shifted progressively to higher concentrations of CTAB. The experimental results are explained in terms of specific solvent effects and the formation of stoichiometric hydrate DMSO Β· 2H~2~O and the inhibitory effect of DMSO on micelle formation. Β© 2006 Wiley Periodicals, Inc. Int J Chem Kinet 38: 634–642, 2006

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