کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
597857 1454076 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inhibition of {cysteine–surfactant} aggregation in cysteine–cystine transformation by alkaline hexacyanoferrate(III); A kinetic study
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Inhibition of {cysteine–surfactant} aggregation in cysteine–cystine transformation by alkaline hexacyanoferrate(III); A kinetic study
چکیده انگلیسی

The kinetics of cysteine–cystine transformation by alkaline hexacyanoferrate(III) in presence of cationic (cetyltrimethyl ammonium bromide, CTAB), anionic (sodium lauryl sulphate, NaLS) and non-ionic (polyoxyethylene (10) octylphenol, Tx-100) surfactant has been studied in the temperature range 25–35 °C. An inhibition effect of CTAB and NaLS on the rate of reaction has been observed at even below the critical miceller concentration (CMC) of the surfactants indicating association/binding of the substrate with the surfactants. Non-ionic surfactant (Tx-100) also retards the rate of reaction but above the CMC of the surfactant. On the basis of the kinetic results, the mechanism of the reaction has been proposed. The kinetic data have also been rationalized in terms of Manger and Portnoy's model for micellar inhibition and binding parameters (viz. binding constants, partition coefficient, free energy transfer from water to micelle, etc.) as well as activation parameters have been evaluated and explained.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 296, Issues 1–3, 15 March 2007, Pages 117–122
نویسندگان
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