scholarly journals The Influence of Available Cu and Au Nanoparticles (NPs) on the Survival of Water Fleas (Daphnia pulex)

2019 ◽  
Vol 16 (19) ◽  
pp. 3617 ◽  
Author(s):  
Garncarek ◽  
Kowalska-Góralska ◽  
Senze ◽  
Czyż
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Daphnia Pulex ◽  
Toxicity Tests ◽  
Median Lethal Concentration ◽  
Au Nps ◽  
Lc50 Value ◽  
Nano Gold ◽  
Acute Toxicity Tests

Applications of nanotechnologies in different sectors and everyday items are very promising and their popularity continues to grow. The number of products containing nanoparticles makes environmental exposure to nanoparticles inevitable. The current understanding of the relationships between nanoparticles and the environment is inadequate despite the fast growth of nanotechnologies. The aim of the study was to investigate the influence of copper and gold nanoparticles on Daphnia pulex survival. Our study included 48-hour acute toxicity tests and determination of median lethal concentration values (LC50s) for Cu-NPs and Au-NPs. For nano-copper, 24 h LC50 was assumed > 1 mg/L, and 48 h LC50 = 0.5117 mg/L. For nano-gold the LC50 value after 24 h was 0.4027 mg/L, and after 48 h 0.1007 mg/L. The toxicity of nano -gold solutions was thus found to be higher than that of nano-copper. The addition of Cu-NPs at 0.0625 mg/L and 0.125 mg/L caused an increased multiplication of daphnia, while Au-NPs at 1 mg/L was an inhibitor of reproduction.

The effects of contaminated sediments of the Blesbok Spruit near Witbank on water quality and the toxicity thereof to Daphnia pulex

1999 ◽  
Vol 39 (10-11) ◽  
pp. 173-176 ◽  
Author(s):  
Liesl Hill ◽  
Sebastian Jooste
Keyword(s):  
Surface Water ◽  
Mine Drainage ◽  
Interstitial Water ◽  
Stream Water ◽  
Daphnia Pulex ◽  
Contaminated Sediments ◽  
Toxicity Tests ◽  
Major Route ◽  
Acute Toxicity Tests ◽  
Route Of Exposure

With the increasing focus on environmental issues, the objective of this study is to evaluate the potential impact of contaminated sediments of the Blesbok Spruit near Witbank - which receives acid mine drainage (AMD) inter alia - on biota. Direct transfer of chemicals from sediments to organisms is considered to be a major route of exposure for many species, and therefore focusing attention on sediment contamination and highlighting the fact that sediments are an important resource. Acute toxicity tests were performed on Daphnia pulex using both extracted sediment interstitial water and surface water. Chemical analyses were also performed on the sediment, interstitial water and surface water samples. The toxicity results suggest that metal toxicity adds significantly to the toxicity of the stream water which is enhanced by the effect of pH. The pH of the stream and interstitial water was consistently below 4.5.

Sensitive Hg2+ Ion Detection Using Metal Enhanced Fluorescence of Novel Polyvinyl Pyrrolidone (PVP)-Templated Gold Nanoparticles

2018 ◽  
Vol 72 (11) ◽  
pp. 1645-1652 ◽  
Author(s):  
Kailong Dong ◽  
Jiasheng Zhou ◽  
Taiqun Yang ◽  
Shan Dai ◽  
Hao Tan ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Detection Limit ◽  
Au Nanoparticles ◽  
Polyvinyl Pyrrolidone ◽  
Quenching Mechanism ◽  
Ion Detection ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence ◽  
One Pot ◽  
Au Nps

In this study, we report a straightforward strategy for Hg2+ ion detection. Fluorescent Au nanoparticles (NPs) were one-pot synthesized using a polymer (polyvinyl pyrrolidone [PVP]) as both capping and fluorescence agent. The as-synthesized PVP-Au NPs showed a remarkably rapid response selectively for Hg2+ ions compared to 14 other metal ions. The detection limit of Hg2+ was estimated at 100 nM. We discuss the emission and quenching mechanism of the PVP-Au NPs, the former being attributed to metal enhanced fluorescence and the latter being related to static quenching by Hg2+. The fluorescence of PVP-Au NPs offers an efficient and reliable strategy for Hg2+ ions detection. They therefore have a great potential for applications in health and environmental monitoring.

scholarly journals The highly sensitive determination of serotonin by using gold nanoparticles (Au NPs) with a localized surface plasmon resonance (LSPR) absorption wavelength in the visible region

RSC Advances ◽  
2020 ◽  
Vol 10 (51) ◽  
pp. 30858-30869
Author(s):  
Phuong Que Tran Do ◽  
Vu Thi Huong ◽  
Nguyen Tran Truc Phuong ◽  
Thi-Hiep Nguyen ◽  
Hanh Kieu Thi Ta ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Visible Region ◽  
Localized Surface Plasmon ◽  
Au Nps ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Sensitive Determination

The development of improved methods for the synthesis of monodisperse gold nanoparticles (Au NPs) is of high priority because they can be used as substrates for surface-enhanced Raman scattering (SERS) applications relating to biological lipids.

scholarly journals A rapid and ultrasensitive colorimetric biosensor based on aptamer functionalized Au nanoparticles for detection of saxitoxin

RSC Advances ◽  
2020 ◽  
Vol 10 (26) ◽  
pp. 15293-15298
Author(s):  
Le Qiang ◽  
Yu Zhang ◽  
Xin Guo ◽  
Yakun Gao ◽  
Yingkuan Han ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Colorimetric Sensor ◽  
Quantitative Detection ◽  
Au Nps

We demonstrate a facile and ultrasensitive colorimetric sensor based on gold nanoparticles (Au NPs) and aptamer (Au NPs-aptamer biosensor) for specific and quantitative detection of STX.

Preparation of Au nanoparticles by Anthemis xylopoda flowers aqueous extract and their application for alkyne/aldehyde/amine A3-type coupling reactions

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 46240-46246 ◽  
Author(s):  
Mahmoud Nasrollahzadeh ◽  
S. Mohammad Sajadi
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Aqueous Extract ◽  
Au Nanoparticles ◽  
Coupling Reactions ◽  
Au Nps ◽  
Type Coupling

This paper reports on the green synthesis of gold nanoparticles (Au NPs) by Anthemis xylopoda flowers aqueous extract without the addition of surfactant agents and their application as stable catalysts for the synthesis of propargylamines.

Influence of Reductants on the Catalytic Properties of Nano-Gold Supported on Mesoporous SBA-15 for Glucose Oxidation

2012 ◽  
Vol 550-553 ◽  
pp. 220-224
Author(s):  
Chao Xian Wang ◽  
Yong Xiu Li ◽  
Hui Liu ◽  
Long Wei Ye ◽  
Chang Yong Sun ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Glucose Oxidation ◽  
Au Nanoparticles ◽  
Catalytic Properties ◽  
Aerobic Oxidation ◽  
Au Nps ◽  
Nano Gold ◽  
Sem And Tem ◽  
Oxidation Of Glucose

Impregnation and deposition-precipitation (DP) methods were employed for the preparation of Au nanoparticles supported on SBA-15, and the influences of various reductants were systematically surveyed. The dispersion and particle size of gold loaded on SBA-15 were determined by XRD, SEM and TEM. It has been found that reductants have effect on the size and dispersion of Au NPs, resulting in different catalytic properties for aerobic oxidation of glucose. The Au NPs on SBA-15 using KBH4as reductant was approximately 5-6 nm, which exhibited excellent catalytic activity.

Highly stable Au nanoparticles with double hydrophilic block copolymer templates: correlation between structure and stability

2017 ◽  
Vol 8 (31) ◽  
pp. 4528-4537 ◽  
Author(s):  
Eunyong Seo ◽  
Sang-Ho Lee ◽  
Sangho Lee ◽  
Soo-Hyung Choi ◽  
Craig J. Hawker ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymer ◽  
Acrylic Acid ◽  
Colloidal Stability ◽  
Au Nanoparticles ◽  
Synthetic Method ◽  
Au Nps ◽  
Double Hydrophilic Block Copolymers ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

We herein report a facile synthetic method for preparing gold nanoparticles (Au NPs) with superior colloidal stability using a series of double hydrophilic block copolymers (DHBC), poly(ethylene oxide)-block-poly(acrylic acid) (PEO-b-PAA), as a template (Au@DHBC NPs).

Increased Toxicity of Ammonia to Rainbow Trout (Salmo gairdneri) Resulting from Reduced Concentrations of Dissolved Oxygen

1981 ◽  
Vol 38 (8) ◽  
pp. 983-988 ◽  
Author(s):  
Robert V. Thurston ◽  
Glenn R. Phillips ◽  
Rosemarie C. Russo ◽  
Susan M. Hinkins
Keyword(s):  
Rainbow Trout ◽  
Dissolved Oxygen ◽  
Ammonia Toxicity ◽  
Control Fish ◽  
Toxicity Tests ◽  
Salmo Gairdneri ◽  
Median Lethal Concentration ◽  
Positive Linear Correlation ◽  
Acute Toxicity Tests ◽  
Flow Through

The median lethal concentration (LC50) of aqueous ammonia at reduced dissolved oxygen (D.O.) concentrations was tested in acute toxicity tests with rainbow trout (Salmo gairdneri) fingerlings. Fifteen 96-h flow-through tests were conducted over the D.O. range 2.6–8.6 mg/L, the former concentration being the lowest at which control fish survived. There was a positive linear correlation between LC50 (milligrams per litre un-ionized ammonia) and D.O. over the entire D.O. range tested; ammonia toxicity increased as D.O. decreased. Ammonia LC50 values were also computed for 12, 24, 48, and 72 h; the correlation with D.O. was greater the shorter the time period.Key words: ammonia toxicity, dissolved oxygen, rainbow trout, Salmo gairdneri

Enantiomeric separation of tryptophan by open-tubular microchip capillary electrophoresis using polydopamine/gold nanoparticles conjugated DNA as stationary phase

2017 ◽  
Vol 9 (23) ◽  
pp. 3561-3568 ◽  
Author(s):  
Yan Zhang ◽  
Yi Zhang ◽  
Wujuan Chen ◽  
Yating Zhang ◽  
Luqi Zhu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Capillary Electrophoresis ◽  
Stationary Phase ◽  
Au Nanoparticles ◽  
Enantiomeric Separation ◽  
Microchip Capillary Electrophoresis ◽  
Au Nps ◽  
Tryptophan Enantiomers

We reported the use of polydopamine/Au nanoparticles/DNA (PDA/Au NPs/DNA) as a stationary phase for the separation of tryptophan enantiomers by microchip capillary electrophoresis (MCE).

Surface Enhanced Raman Scattering of Defective TiO2 with Gold Au NPs by Green Method

2021 ◽  
Vol 19 (7) ◽  
pp. 25-34
Author(s):  
Alaa A. Shanef ◽  
Waleed Hameed Abed ◽  
Ahmed R. Mathloom
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Gas Sensors ◽  
Au Nanoparticles ◽  
Tio2 Films ◽  
Green Method ◽  
Au Nps ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

This works strong the embossing as regards riches (Au) nanoparticles (NPs) regarding attenuate TiO2 films. Au (Au-TiO2) patterned flabby film TiO2. The morphology, cleanly structure, issue administration then optical homes concerning the films hold been studied. Gold nanoparticles (Au-NPs) are synthesized along the useful resource on lowering hydrated gold steel ions of touch together along aqueous sow dermis extract. The alternate among the elevation or assignment about Au NPs elevated the reply above the ethanol gas sensors. The organized Au-TiO2 was once tested, of assessment together with allusion TiO2 membranes, such then ethanol sensors at 250-350 ° C at a fuel attention of 50-1000 ppm. In addition, the SERS deep concerning the excised Au/ TiO2 emaciated movie is about iii cases that above the deposited Au/ TiO2 gaunt film. The results proven in imitation of so much aggregation Au-coated TiO2 at 6 s spray epoch gave the beneficial file on 514 at 350 ° C deed useless heat since 1000 ppm fuel concentration.

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