Document Details

Document Type : Article In Journal 
Document Title :
Role of cetyltrimethylammonium bromide (cationic surfactant) on the tryptophan-MnO4- reaction
Role of cetyltrimethylammonium bromide (cationic surfactant) on the tryptophan-MnO4- reaction
 
Subject : Chemistry 
Document Language : English 
Abstract : Upon addition of permanganate to a solution of tryptophan (Trp), yellow-brown color species appears within the time of mixing of tryptophan in absence and presence of cetyltrimethylammonium bromide (CTAB), which was stable for some days. Spectroscopic and kinetic evidences suggest the formation of water-soluble colloidal MnO2 as the most stable reduction product of MnO4-. Carbon dioxide and ammonia are not formed as the oxidation products. Carbon-carbon double bond of indole moiety of Trp is responsible for the fast reduction of permanganate. Cetyltrimethylammonium bromide catalyses the permanganate oxidation of Trp with a rate enhancement of ca. 200-fold. Sub- and postmicellar catalytic effect of CTAB ascribed to the association/incorporation/solubilization of both reactants (MnO4- and Trp) with the CTAB aggregates and into the Stern layer of cationic micelles. Quantitative kinetic analysis of the rate constant-[CTAB] data has been performed on the basis of modified pseudo-phase model of the micelles. A comparison was made of the oxidation rates of different amino acids by permanganate. The order of the effectiveness was as follows: tryptophan ≫ tyrosine ≫ phenylalanine. 
ISSN : 09277765 
Journal Name : Colloids and Surfaces B: Biointerfaces 
Volume : 72 
Issue Number : 2 
Publishing Year : 2009 AH
2009 AD 
Number Of Pages : 6 
Article Type : Article 
Added Date : Monday, October 5, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
ظهير خانKhan, ZResearcherDoctoratedrkhanchem@yahoo.com
-Malik, M.AResearcherDoctorate 

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