scholarly journals Development of a paper-based analytical device for colorimetric detection of uric acid using gold nanoparticles–graphene oxide (AuNPs–GO) conjugates

2016 ◽  
Vol 8 (38) ◽  
pp. 6965-6973 ◽  
Author(s):  
Sanjay Kumar ◽  
Pulak Bhushan ◽  
Shantanu Bhattacharya
Keyword(s):  
Gold Nanoparticles ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Colorimetric Detection ◽  
Analytical Device

A novel paper-based device for colorimetric detection of uric acid was developed based on the peroxidase-like activity of gold nanoparticles–graphene conjugates (AuNPs–GO).

scholarly journals N-Doped Reduced Graphene Oxide/Gold Nanoparticles Composite as an Improved Sensing Platform for Simultaneous Detection of Dopamine, Ascorbic Acid, and Uric Acid

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4427
Author(s):  
Daria Minta ◽  
Zoraida González ◽  
Piotr Wiench ◽  
Stanisław Gryglewicz ◽  
Grażyna Gryglewicz
Keyword(s):  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Detection Limit ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Simultaneous Detection ◽  
Homogeneous Distribution ◽  
Reduced Graphene

Gold nanoparticles (AuNPs) were homogeneously electrodeposited on nitrogen-doped reduced graphene oxide (N-rGO) to modify a glassy carbon electrode (GCE/N-rGO-Au) in order to improve the simultaneous detection of dopamine (DA), ascorbic acid (AA), and uric acid (UA). N-rGO was prepared by the hydrothermal treatment of graphene oxide (GO) and urea at 180 °C for 12 h. AuNPs were subsequently electrodeposited onto the surface of GCE/N-rGO using 1 mM HAuCl4 solution. The morphology and chemical composition of the synthesized materials were characterized by field-emission scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical performance of the modified electrodes was investigated through cyclic voltammetry and differential pulse voltammetry measurements. Compared to GCE/rGO-Au, GCE/N-rGO-Au exhibited better electrochemical performance towards the simultaneous detection of the three analytes due to the more homogeneous distribution of the metallic nanoparticles as a result of more efficient anchoring on the N-doped areas of the graphene structure. The GCE/N-rGO-Au-based sensor operated in a wide linear range of DA (3–100 µM), AA (550–1500 µM), and UA (20–1000 µM) concentrations with a detection limit of 2.4, 58, and 8.7 µM, respectively, and exhibited satisfactory peak potential separation values of 0.34 V (AA-DA), 0.20 V, (DA-UA) and 0.54 V (AA-UA). Remarkably, GCE/N-rGO-Au showed a very low detection limit of 385 nM towards DA, not being susceptible to interference, and maintained 90% of its initial electrochemical signal after one month, indicating an excellent long-term stability.

Determination of salivary uric acid by using poly(3,4-ethylenedioxythipohene) and graphene oxide in a disposable paper-based analytical device

2020 ◽  
Vol 1103 ◽  
pp. 75-83 ◽  
Author(s):  
Xin Huang ◽  
Weishan Shi ◽  
Jing Li ◽  
Ning Bao ◽  
Chunmei Yu ◽  
...  
Keyword(s):  
Uric Acid ◽  
Graphene Oxide ◽  
Analytical Device

Development of Uric Acid Biosensor Using Gold Nanoparticles and Graphene Oxide Functionalized Micro-Ball Fiber Sensor Probe

2020 ◽  
Vol 19 (2) ◽  
pp. 173-182 ◽  
Author(s):  
Santosh Kumar ◽  
Ragini Singh ◽  
Guo Zhu ◽  
Qingshan Yang ◽  
Xia Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Fiber Sensor ◽  
Sensor Probe ◽  
Uric Acid Biosensor

LSPR based uric acid sensor using graphene oxide and gold nanoparticles functionalized tapered fiber

2019 ◽  
Vol 53 ◽  
pp. 102043 ◽  
Author(s):  
Lokendra Singh ◽  
Ragini Singh ◽  
Bingyuan Zhang ◽  
Shuang Cheng ◽  
Brajesh Kumar Kaushik ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Tapered Fiber

Visual and colorimetric detection of uric acid in human serum and urine using chitosan stabilized gold nanoparticles

2021 ◽  
Vol 164 ◽  
pp. 105987
Author(s):  
Fan Li ◽  
Tianshuang He ◽  
Sihao Wu ◽  
Zoujun Peng ◽  
Ping Qiu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Uric Acid ◽  
Human Serum ◽  
Colorimetric Detection ◽  
Serum And Urine
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