scholarly journals A method for the quantitative extraction of gold nanoparticles from human bronchoalveolar lavage fluids through a glycerol gradient

Nanoscale ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 2955-2969 ◽  
Author(s):  
Dimitrios Bitounis ◽  
Vincent Barnier ◽  
Cyril Guibert ◽  
Jérémie Pourchez ◽  
Valérie Forest ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Bronchoalveolar Lavage ◽  
Simple Method ◽  
Glycerol Gradient ◽  
Quantitative Extraction

We report a simple method for the clinically-oriented extraction of sub-ppm gold nanoparticles from human bronchoalveolar lavage fluids.

Green Formation of Nano-Hexagon from Nano-Triangle of Gold Nanoparticles Using Palm Oil Fronds Extracts

2019 ◽  
Vol 290 ◽  
pp. 87-92
Author(s):  
Adamu Ibrahim Usman ◽  
Azlan Abdul Aziz ◽  
Osama Abu Noqta
Keyword(s):  
Gold Nanoparticles ◽  
Palm Oil ◽  
Good Control ◽  
Soft Template ◽  
Face Centered Cubic ◽  
Simple Method ◽  
Vis Spectroscopy ◽  
Production Techniques ◽  
Face Centered ◽  
Xrd Patterns

A simple method to synthesized nanoparticles was satisfied by reduction of tetrachloroauric acid in the presence of palm oil fronds extracts as capping and reduced agents. The as-synthesized gold nanoparticles structures have a triangular and hexagonal shape that are of tens of nanometre in size. It was realized that good control shape of nano-hexagonal gold nanoparticles were obtained from nano-triangular gold nanoparticles in the absence of any soft template. The production techniques of the gold nanoparticles were examined by using UV-vis spectroscopy, EFTEM and XRD patterns, which showed peaks at (111), (200), (220), (311) and (222), that described the preferential structure of the AuNPs as face-centered cubic crystal

scholarly journals Gold Nanoparticles with Different Particle Sizes for the Quantitative Determination of Chlorpyrifos Residues in Soil by SERS

2019 ◽  
Vol 20 (11) ◽  
pp. 2817 ◽  
Author(s):  
Yong He ◽  
Shupei Xiao ◽  
Tao Dong ◽  
Pengcheng Nie
Keyword(s):  
Gold Nanoparticles ◽  
Limit Of Detection ◽  
Soil Surface ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate ◽  
Least Squares Regression ◽  
Simple Method ◽  
Good Linear ◽  
Relative Standard

Chlorpyrifos (CPF) is widely used in the prevention and control of crop pests and diseases in agriculture. However, the irrational utilization of pesticides not only causes environmental pollution but also threatens human health. Compared with the conventional techniques for the determination of pesticides in soil, surface-enhanced Raman spectroscopy (SERS) has shown great potential in ultrasensitive and chemical analysis. Therefore, this paper reported a simple method for synthesizing gold nanoparticles (AuNPs) with different sizes used as a SERS substrate for the determination of CPF residues in soil for the first time. The results showed that there was a good linear correlation between the SERS characteristic peak intensity of CPF and particle size of the AuNPs with an R2 of 0.9973. Moreover, the prepared AuNPs performed great ultrasensitivity, reproducibility and chemical stability, and the limit of detection (LOD) of the CPF was found to be as low as 10 μg/L. Furthermore, the concentrations ranging from 0.01 to 10 mg/L were easily observed by SERS with the prepared AuNPs and the SERS intensity showed a good linear relationship with an R2 of 0.985. The determination coefficient (Rp2) reached 0.977 for CPF prediction using the partial least squares regression (PLSR) model and the LOD of CPF residues in soil was found to be as low as 0.025 mg/kg. The relative standard deviation (RSD) was less than 3.69% and the recovery ranged from 97.5 to 103.3%. In summary, this simple method for AuNPs fabrication with ultrasensitivity and reproducibility confirms that the SERS is highly promising for the determination of soil pesticide residues.

Simple Method of Synthesizing Nickel–Nitrilotriacetic Acid Gold Nanoparticles with a Narrow Size Distribution for Protein Labeling

2011 ◽  
Vol 50 (9) ◽  
pp. 095002 ◽  
Author(s):  
Toshiyuki Kitai ◽  
Yuta Watanabe ◽  
Yoko Y. Toyoshima ◽  
Takuya Kobayashi ◽  
Takashi Murayama ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Size Distribution ◽  
Nitrilotriacetic Acid ◽  
Protein Labeling ◽  
Narrow Size Distribution ◽  
Simple Method

A simple method to fabricate a chitosan-gold nanoparticles film and its application in glucose biosensor

2007 ◽  
Vol 70 (2) ◽  
pp. 342-347 ◽  
Author(s):  
Ying Du ◽  
Xi-Liang Luo ◽  
Jing-Juan Xu ◽  
Hong-Yuan Chen
Keyword(s):  
Gold Nanoparticles ◽  
Glucose Biosensor ◽  
Simple Method

scholarly journals Gold Nanoparticles for Qualitative Detection of Deltamethrin and Carbofuran Residues in Soil by Surface Enhanced Raman Scattering (SERS)

2019 ◽  
Vol 20 (7) ◽  
pp. 1731 ◽  
Author(s):  
Yong He ◽  
Shupei Xiao ◽  
Tao Dong ◽  
Pengcheng Nie
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Trisodium Citrate ◽  
Surface Enhanced Raman Scattering ◽  
Chloroauric Acid ◽  
Simple Method ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Intractable Problem

The residues of deltamethrin (DM) and carbofuran (CBF) in soil is becoming an intractable problem causing soil hardening and environmental pollution. This paper reports a very simple method via improved reduction of chloroauric acid by the trisodium citrate method for fabricating gold nanoparticles (AuNPs), which were used as a surface enhanced Raman scattering (SERS) active colloids with the advantages of ultrasensitivity, reproducibility and chemical stability. The results demonstrated that the limits of detection (LODs) of the DM and CBF were found to be as low as 0.01 mg/L. The SERS intensity showed a good linear relationship with DM (R2 = 0.9908) and CBF (R2 = 0.9801) concentration from 0.01 to 10 mg/L. In a practical application, DM and CBF residues in soil were easily detected by SERS with the flexible AuNPs colloids, and the LODs of DM and CBF were found to be as low as 0.056 mg/kg and 0.053 mg/kg, respectively. Moreover, DM in soil could be qualitatively detected by the characteristic peaks at 560 and 1000 cm−1, and CBF in soil could be qualitatively detected by the characteristic peaks at 1000 and 1299 cm−1. The determination coefficient (R2p) for DM and CBF reached 0.9176 and 0.8517 in partial least squares (PLS) model. Overall, it is believed that the prepared AuNPs can provide technical support for the accurate detection of pesticide residues in soil by SERS technique.

Simultaneous detection of Dopamine and Serotonin in real complex matrices

2020 ◽  
Vol 16 ◽  
Author(s):  
Florina Truţă ◽  
Mihaela Tertisa ◽  
Cecilia Cristea ◽  
Florin Graur
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Simultaneous Detection ◽  
Multiwall Carbon Nanotubes ◽  
Differential Pulse ◽  
Sensitive Detection ◽  
Complex Matrices ◽  
Simple Method ◽  
Starting Point ◽  
Highly Sensitive Detection

Background: Neurotransmitters are chemical messengers with crucial implication in human body. Perturbations in concentration of neurotransmitters can affect a multitude of mental and physical functions, such as heart rate, sleep, appetite and mood. Thus, the sensitive detection of these compounds is a real need for a new generation of treatments. Method: Two important neurotransmitters namely dopamine and serotonin were investigated in this study for simultaneous detection using differential pulse voltammetry. The optimization of several surface parameters were performed in order to choose the best electrode material for electrochemical oxidation of targets. Screen printed electrodes based on carbon, gold and platinum and modified with different nanomaterials (carbon nanotubes, gold nanoparticles and carbon nanotubes decorated with gold nanoparticles) were tested. Results: Carbon-based electrodes modified with multiwall carbon nanotubes and gold nanoparticles were chosen after the optimization protocol. Linear correlations between the analytic signals obtained and the concentration of dopamine and serotonin respectively were obtained with good sensitivity and the detection limits were 0.3 µM for dopamine and 0.8 µM for serotonin with no significant reciprocal influences. Selectivity studies were also performed, as well as tests in real samples (e.g. human serum, tears and saliva) complex matrices for which acceptable recoveries were obtained. Conclusion: The results obtained within this study can be considered as an important starting point for the development of a fast and simple method for selective and highly sensitive detection of neurotransmitters, with possible applications in the diagnosis of different pathologies and for monitoring the effectiveness of the applied drug treatment.

A simple method to synthesize fluorescent modified gold nanoparticles using tryptamine as the reducing and capping agent

2013 ◽  
Vol 185-186 ◽  
pp. 61-65 ◽  
Author(s):  
Marcos Alberto de Carvalho ◽  
Patrícia Fernanda Andrade ◽  
Fabiana Cristina Andrade Corbi ◽  
Maria do Carmo Gonçalves ◽  
André Luiz Barboza Formiga ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Capping Agent ◽  
Simple Method
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