کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1244888 | 969707 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical behaviors of guanosine on carbon ionic liquid electrode and its determination
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electrochemical behaviors of guanosine on carbon ionic liquid electrode and its determination Electrochemical behaviors of guanosine on carbon ionic liquid electrode and its determination](/preview/png/1244888.png)
چکیده انگلیسی
The electrochemical behaviors of guanosine on the ionic liquid of N-butylpyridinium hexafluorophosphate (BPPF6) modified carbon paste electrode (CPE) was studied in this paper and further used for guanosine detection. Guanosine showed an adsorption irreversible oxidation process on the carbon ionic liquid electrode (CILE) with the oxidation peak potential located at 1.12 V (vs. SCE) in a pH 4.5 Britton-Robinson (B-R) buffer solution. Compared with that on the traditional carbon paste electrode, small shift of the oxidation peak potentials appeared but with a great increment of the oxidation peak current on the CILE, which was due to the presence of ionic liquid in the modified electrode adsorbed the guanosine on the surface and promoted the electrochemical response. The electrochemical parameters such as the electron transfer coefficient (α), the electron transfer number (n), and the electrode reaction standard rate constant (ks) were calculated as 0.74, 1.9 and 1.26 Ã 10â4 sâ1, respectively. Under the optimal conditions the oxidation peak current showed a good linear relationship with the guanosine concentration in the range from 1.0 Ã 10â6 to 1.0 Ã 10â4 mol/L by cyclic voltammetry with the detection limit of 2.61 Ã 10â7 mol/L (3Ï). The common coexisting substances showed no interferences to the guanosine oxidation. The CILE showed good ability to distinguish the electrochemical response of guanosine and guanine in the mixture solution. The urine samples were further detected by the proposed method with satisfactory results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 78, Issue 3, 15 May 2009, Pages 695-699
Journal: Talanta - Volume 78, Issue 3, 15 May 2009, Pages 695-699
نویسندگان
Wei Sun, Yuanyuan Duan, Yinzhuo Li, Hongwei Gao, Kui Jiao,