کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7147852 1462099 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic beads based colorimetric detection of mercuric ion
ترجمه فارسی عنوان
دانه های مغناطیسی مبتنی بر شناسایی کلریمتریک یون جیوه است
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
A simple and sensitive DNAzyme-based colorimetric sensor for detecting Hg2+ based on T-Hg2+-T base pair and magnetic beads (MBs) is proposed. In the presence of Hg2+, capture probes (CPs) immobilized on MBs are hybridized with the signal probes (SPs) consisting of G-quadruplex sequences with the help of T-Hg2+-T base pairs. The SPs are separated by MBs and used to bind hemin for the formation of catalytically active hemin/G-quadruplex DNAzymes, which catalyzes the H2O2-mediated oxidation of ABTS to produce a blue-green-colored product. A linear relationship between the absorbance and Hg2+ concentration is observed over a range of 10-200 nM with a limit of detection 5 nM. Taking advantage of MBs separation/collection process, the sensing system can be regenerated by using EDTA as the chelator.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 191, February 2014, Pages 600-604
نویسندگان
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