Electrochemical DNA sensor by the assembly of graphene and DNA-conjugated gold nanoparticles with silver enhancement strategy

The Analyst ◽  
2011 ◽  
Vol 136 (22) ◽  
pp. 4732 ◽  
Author(s):  
Lei Lin ◽  
Yang Liu ◽  
Longhua Tang ◽  
Jinghong Li
Keyword(s):  
Gold Nanoparticles ◽  
Dna Sensor ◽  
Silver Enhancement ◽  
Electrochemical Dna Sensor

scholarly journals Electrochemical DNA Sensor for Sensitive BRCA1 Detection Based on DNA Tetrahedral-Structured Probe and Poly-Adenine Mediated Gold Nanoparticles

Biosensors ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 78
Author(s):  
Dezhi Feng ◽  
Jing Su ◽  
Guifang He ◽  
Yi Xu ◽  
Chenguang Wang ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Gold Nanoparticles ◽  
Early Diagnosis ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Dna Sensor ◽  
Electrochemical Dna Sensor ◽  
Target Dna ◽  
Potential Applications ◽  
Sandwich System

BRCA1 is the biomarker for the early diagnosis of breast cancer. Detection of BRCA1 has great significance for the genetic analysis, early diagnosis and clinical treatment of breast cancer. In this work, we developed a simple electrochemical DNA sensor based on a DNA tetrahedral-structured probe (TSP) and poly-adenine (polyA) mediated gold nanoparticles (AuNPs) for the sensitive detection of BRCA1. A thiol-modified TSP was used as the scaffold on the surface of the screen-printed AuNPs electrode. The capture DNA (TSP) and reporter DNA were hybridized to the target DNA (BRCA1), respectively, to form the typical sandwich system. The nanocomposites of reporter DNA (polyA at the 5′ end) combined with AuNPs were employed for signal amplification which can capture multiple enzymes by the specificity between biotin and streptavidin. Measurements were completed in the electrochemical workstation by cyclic voltammetry and amperometry and we obtained the low limit of detection of 0.1 fM with the linear range from 1 fM to 1 nM. High sensitivity and good specificity of the proposed electrochemical DNA sensor showed potential applications in clinical early diagnosis for breast cancer.

Amplified Electrochemical DNA Sensor Based on Polyaniline Film and Gold Nanoparticles

2013 ◽  
Vol 25 (6) ◽  
pp. 1373-1380 ◽  
Author(s):  
Reyhaneh-Sadat Saberi ◽  
Saeed Shahrokhian ◽  
Giovanna Marrazza
Keyword(s):  
Gold Nanoparticles ◽  
Dna Sensor ◽  
Polyaniline Film ◽  
Electrochemical Dna Sensor

Silver Nanoparticles Decorated Polyaniline Nanowires-Based Electrochemical DNA Sensor: Two-step Electrochemical Synthesis

2020 ◽  
Vol 167 (8) ◽  
pp. 087508 ◽  
Author(s):  
Luyen Thi Tran ◽  
Hoang Vinh Tran ◽  
Hue Thi Minh Dang ◽  
Chinh Dang Huynh ◽  
Tuan Anh Mai
Keyword(s):  
Silver Nanoparticles ◽  
Electrochemical Synthesis ◽  
Dna Sensor ◽  
Electrochemical Dna Sensor ◽  
Polyaniline Nanowires

scholarly journals Electrochemical DNA Sensor Based on Carbon Black—Poly(Neutral Red) Composite for Detection of Oxidative DNA Damage

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3489 ◽  
Author(s):  
Yurii Kuzin ◽  
Dominika Kappo ◽  
Anna Porfireva ◽  
Dmitry Shurpik ◽  
Ivan Stoikov ◽  
...  
Keyword(s):  
Carbon Black ◽  
Oxidative Dna Damage ◽  
Electrochemical Impedance ◽  
Neutral Red ◽  
Redox Activity ◽  
Antitumor Drugs ◽  
Oxygen Species ◽  
Dna Sensor ◽  
Electrochemical Dna Sensor ◽  
Polymeric Dye

Voltammetric DNA sensor has been proposed on the platform of glassy carbon electrode covered with carbon black with adsorbed pillar[5]arene molecules. Electropolymerization of Neutral Red performed in the presence of native or oxidatively damaged DNA resulted in formation of hybrid material which activity depended on the DNA conditions. The assembling of the surface layer was confirmed by scanning electron microscopy and electrochemical impedance spectroscopy. The influence of DNA and pillar[5]arene on redox activity of polymeric dye was investigated and a significant increase of the peak currents was found for DNA damaged by reactive oxygen species generated by Cu2+/H2O2 mixture. Pillar[5]arene improves the electron exchange conditions and increases the response and its reproducibility. The applicability of the DNA sensor developed was shown on the example of ascorbic acid as antioxidant. It decreases the current in the concentration range from 1.0 μM to 1.0 mM. The possibility to detect antioxidant activity was qualitatively confirmed by testing tera infusion. The DNA sensor developed can find application in testing of carcinogenic species and searching for new antitumor drugs.

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