کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1163132 1490933 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Label-free aptamer biosensor for selective detection of thrombin
ترجمه فارسی عنوان
بیوزنسور آپتامر بدون برچسب برای تشخیص انتخابی ترومبین
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• A novel strategy for the detection of thrombin was established based on BSA-CdS QDs.
• DNA could serve as the co-ligands to stabilize CdS QDs and enhance the fluorescence intensity.
• Thrombin could change the structure of DNA1 and quench the fluorescence of CdS QDs.
• Thrombin in real sample was detected with satisfactory results.

We fabricated a novel fluorescence biosensor for the selective detection of thrombin by using bovine serum albumin-capped CdS quantum dots (BSA-CdS QDs). Two kinds of designed DNA (DNA1 and DNA2) could bind to CdS QDs through the electrostatic interaction between DNA and Cd2+ on the surface of CdS QDs. The obtained DNA/BSA-CdS QDs kept stable in the solution with the fluorescence intensity obviously enhanced. Hairpin structure of DNA1contained two domains, one is the aptamer sequence of thrombin and the other is the complementary sequence of DNA2. When thrombin was added, it would bind to DNA1 and induce the hairpin structure of DNA1 changed into G-quadplex structure. Meanwhile, DNA2 would transfer from the surface of CdS QDs to DNA1 via hybridization, which resulted in the removal of DNA1 and DNA2 from the surface of CdS QDs, and led to the fluorescence intensity of CdS QDs reduced. Thus, the determination of thrombin could be achieved by monitoring the change of the fluorescence intensity of CdS QDs. The present method is simple and fast, and exhibits good selectivity for thrombin over other proteins. We have successfully detected thrombin in human serum samples with satisfactory results.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 899, 29 October 2015, Pages 85–90
نویسندگان
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