کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
742997 894337 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A sensitive electrochemical sensor based on chitosan and electropolymerized Meldola blue for monitoring NO in brain slices
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
A sensitive electrochemical sensor based on chitosan and electropolymerized Meldola blue for monitoring NO in brain slices
چکیده انگلیسی

We report the development of a novel electrochemical NO microsensor using electrodeposited Meldola blue (MB) as an electron mediator, o-phenylenediamine (o-PD) as a permselective membrane and a natural biocompatible polymer, chitosan as a protective coating, all deposited sequentially on a platinum microelectrode with a diameter of 125 μm. The electron transfer kinetics and the role of each component in the sensing layer were systematically studied in relation to the analytical performance of the corresponding chemically modified Pt microelectrodes. The use of an electropolymerized MB layer ensured stability of the mediator while the chitosan biopolymer provided a protective layer for the o-PD and MB as well as some sieving function against interferents, ascorbic acid and dopamine. The new NO microsensor demonstrated an extended linear range between 10 nM and 600 μM, with a R2 value of 0.9993, one order of magnitude wider than that of other NO microsensors reported to date, and a sensitivity of 20 nA μM−1. The detection limit of the sensor was 1 nM and the response time was 8 s. The chemically modified microelectrode was able to measure induced NO production in brain slices in a dose dependent manner. The stability of the active sensing surface was established both in standard NO solutions and in rat brain slices, and the sensitivity decreased by only 4% post-NO measurement in the brain slice.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 143, Issue 2, 7 January 2010, Pages 673–680
نویسندگان
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