کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6663739 | 463292 | 2011 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
3-Mercaptopropionic acid capped ZnSe quantum dot-cytochrome P450 3A4 enzyme biotransducer for 17β-estradiol
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
A 3-mercaptopropionic acid capped ZnSe quantum dot/cytochrome P450 3A4 enzyme electrochemical biotransducer for 17β-estradiol (endocrine disrupting compound) is presented. The biotransducer combines both the electric and chemical properties of 3-mercaptopropionic acid capped ZnSe quantum dots as well as redox and binding affinity properties of the cytochrome P450 3A4 enzyme to steroids. 3-mercaptopropionic acid capped ZnSe quantum dots were conjugated to gold electrode, previously modified with self-assembled l-cysteamine. Cytochrome P450 3A4 enzyme was then conjugated onto the modified gold electrode for 3 h. A Fourier transform infrared spectra of this biotransducer showed a band at 2956 cmâ1, confirming the formation of a secondary amide bond from free carboxylic groups on the ZnSe quantum dots surface and amine groups on the cytochrome P450 3A4 enzyme. The biotransducer showed proportional increase in current with increasing concentration of 17β-estradiol in a phosphate buffer under aerobic conditions. A high sensitivity (1.08 Ã 10â5 A μMâ1) and a low Michaelis-Menten constant (Kmapp=0.15mM) obtained for this biotransducer confirms that the cytochrome P450 3A4 was immobilized in a biocompatible microenvironment, retained its catalytic properties and exhibited high enzymatic activity towards 17β-estradiol. The detection limit was 1.03 Ã 10â10 mol Lâ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 653, Issues 1â2, 1 April 2011, Pages 67-74
Journal: Journal of Electroanalytical Chemistry - Volume 653, Issues 1â2, 1 April 2011, Pages 67-74
نویسندگان
Peter M. Ndangili, Abongile M. Jijana, Priscilla G.L. Baker, Emmanuel I. Iwuoha,