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Kinetics of interaction of Histidine and Histidine Methyl Ester with Ninhydrin in micellar media

✍ Scribed by Kabir-Ud-Din; Md. Z. A. Rafiquee; Mohd. Akram; Zaheer Khan

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 187 KB
Volume: 31
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1999)31:2<103::aid-kin4>3.0.co;2-4

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✦ Synopsis

Kinetics of the interaction of histidine and histidine methyl ester with ninhydrin under varying concentrations of reactants, anionic (sodium dodecyl sulphate, SDS), cationic (cetyltrimethylammonium bromide, CTAB) and non-ionic (Triton X-100, TX-100) micelles have been carried out. Rate of the reaction was found to be independent of the initial concentration of histidine (and histidine methyl ester) but was dependent on [Ninhydrin]. The SDS micelles had no effect on the rate of the reaction. In the presence of the CTAB micelles a small enhancement in the rate was observed. The profile showed that the increase in rate Ϫ [CTAB]

[CTAB] increased the rate up to a maximum value and a further increase had a decreasing effect on the rate. The rate was enhanced by TX-100 also but, unlike CTAB micelles, TX-100 possessed a curve without peak for the profile. The following rate equation rate Ϫ [TX-100] was obeyed by the reaction in CTAB and TX-100 micelles:

Values of k w , k m , and K S were evaluated and are reported herein.

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