کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5130911 1490869 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrasensitive immunosensor for prostate specific antigen using biomimetic polydopamine nanospheres as an electrochemiluminescence superquencher and antibody carriers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Ultrasensitive immunosensor for prostate specific antigen using biomimetic polydopamine nanospheres as an electrochemiluminescence superquencher and antibody carriers
چکیده انگلیسی


- Novel ECL immunosensor for the detection of PSA was designed.
- MWCNTs-NH2/Nafion composite film with Ru(bpy)32+ incorporated was used as luminophor.
- The quenching of Ru(bpy)32+ ECL by biomimetic polydopamine nanospheres.
- The immunosensor exhibited an extremely low detection limit of 35 fg mL−1 for PSA.

In this work, biomimetic polydopamine nanospheres (PDANSs) were easily prepared and were firstly exploited as an electrochemiluminescence (ECL) nanoquencher for the development of a sandwich type immunosensor. The PDANSs with abundant active functional groups can facilely label the detection antibody and show remarkable quenching effect towards the ECL of the tris-(2,2'-bipyridine)ruthenium (Ru(bpy)32+). The amino-modified multiwall carbon nanotubes/Nafion (MWCNTs-NH2@N) composite-film was adopted as a matrix to incorporate the luminophor Ru(bpy)32+ and immobilize the capture antibody. The prominent decrease of ECL signal intensity was obtained on account of the unique quenching ability of the labeled PDANSs. The quenching mechanism is believed that the excited states of Ru(bpy)32+ can be annihilated by quinone units in PDANSs via energy transfer. The ECL quenching efficiency was logarithmically related to the concentration of the prostate specific antigen (PSA) in the range from 0.1 pg mL−1 to 20 ng mL−1 with a detection limit of 35 fg mL−1. Furthermore, the proposed ECL immunosensor presented good stability, repeatability and selectivity.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 963, 22 April 2017, Pages 17-23
نویسندگان
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