Humic acid regulation of the environmental behavior and phytotoxicity of silver nanoparticles to Lemna minor

2019 ◽  
Vol 6 (12) ◽  
pp. 3712-3722 ◽  
Author(s):  
Yuanyuan Ding ◽  
Xue Bai ◽  
Zhengfang Ye ◽  
Dongqing Gong ◽  
Jiajing Cao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Humic Acid ◽  
Functional Groups ◽  
Molecular Interaction ◽  
Lemna Minor ◽  
Environmental Behavior

Results suggest that molecular interaction occurs between AgNPs and HA functional groups and HA can reduce the toxicity of AgNPs to Lemna minor.

The study of humification process of compost using humic acid and its functional groups

2010 ◽  
Author(s):  
Natdhera Sanmanee ◽  
Anchalee Chainet ◽  
Kullanart Obsuwan ◽  
Kamolchanok Panishkan ◽  
Sirichai Dharmvanij
Keyword(s):  
Humic Acid ◽  
Functional Groups

scholarly journals Optical characterization and concentration-dependent antibacterial activity of silver nanoparticles (AgNPs) using aqueous Melastoma malabathricum extract against Staphylococcus aureus

2020 ◽  
Vol 11 (4) ◽  
pp. 5382-5387
Author(s):  
Irshad Ul Haq Bhat ◽  
Maisarah Binti Alias
Keyword(s):  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Functional Groups ◽  
Diffusion Method ◽  
Synthetic Approach ◽  
Potential Candidate ◽  
X Ray ◽  
Melastoma Malabathricum ◽  
Resonance Band

The approach towards green synthetic methods has been enormously encouraged to synthesise nanoparticles for various uses. In this study, the one-pot synthetic method was adapted to synthesise silver nanoparticles (AgNPs) using Melastoma malabathricum (M. malabathricum) aqueous extract. The formation of AgNPs was confirmed by observing the results obtained by optical characterisation methods. The plasma resonance band along with shoulder at 375 nm and 595 nm, respectively, in Uv-Visible spectra supported the conversion of silver (Ag) to AgNPs reduced by functional groups present in the plant extract. The size of AgNPs was 31 nm and cubic in shape as confirmed by X-ray diffractometry (XRD) using Scherer equation. X-Ray Fluorescence (XRF) results also confirmed the presence of silver. The FTIR characterisation confirmed the presence of reducing functional groups. The antibacterial activity of AgNPs against Staphylococcus aureus (S. aureus) was carried out by disc diffusion method with increasing concentration of AgNPs, and enhanced inhibition zone was observed. The AgNPs obtained can be further explored against different bacterial strains and can a potential candidate as an antibacterial agent using the green synthetic approach.

Inter-transformation between silver nanoparticles and Ag+ induced by humic acid under light or dark conditions

Ecotoxicology ◽  
2020 ◽  
Author(s):  
Yujia Liu ◽  
Chao Li ◽  
Si Luo ◽  
Xi Wang ◽  
Qingmei Zhang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Humic Acid ◽  
Dark Conditions

Humic Acid Functionalized - Silver Nanoparticles as Nanosensor for Colorimetric Detection of Copper (II) Ions in Aqueous Solutions

2020 ◽  
Vol 831 ◽  
pp. 142-150
Author(s):  
Edgar Clyde R. Lopez ◽  
Michael Angelo Zafra ◽  
Jon Nyner L. Gavan ◽  
Emil David A. Villena ◽  
Francis Eric P. Almaquer ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Humic Acid ◽  
Aqueous Solutions ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Hydrodynamic Diameter ◽  
Limit Of Quantification ◽  
Local Surface Plasmon Resonance ◽  
Optical Absorbance ◽  
Absorbance Spectra

Humic acid - functionalized silver nanoparticles (HA-AgNPs) were successfully synthesized and used to detect Cu (II) ions in aqueous solutions. The HA-AgNPs was shown to have an average hydrodynamic diameter of 101.4 nm and a polydispersity index of 0.447. The absorbance spectra of HA-AgNPs showed the characteristic local surface plasmon resonance (LSPR) peak of AgNPs at 408.3 nm. Addition of Cu (II) in the HA-AgNPs led to their agglomeration as evidenced by the change in their surface morphology and their corresponding optical absorbance spectra. The synthesized HA-AgNPs showed a strong linear response for Cu (II) concentrations in the range of 0.00 – 1.25 mM with a limit of detection (LoD) of 4.4428 ± 0.1091 mg L-1, a limit of quantification (LoQ) of 14.8094 ± 0.3636 mg L-1, and a limit of blank (LoB) of 0.1214 ± 0.0065 mg L-1. Statistical analysis showed that this calibration curve could be used to quantify Cu (II) concentrations within a 95% confidence level. Furthermore, HA-AgNPs was found to be selective for Cu (II) detection based on the selectivity study against common metal ions found in drinking water. This shows that the synthesized HA-AgNPs can be used as an environment-friendly colorimetric nanosensor for rapid and point-of-need quantification of Cu (II) ions in aqueous media.

scholarly journals Molecular Interaction of Aqueous Iodine Species with Humic Acid Studied by I and C K-Edge X-ray Absorption Spectroscopy

2019 ◽  
Vol 53 (21) ◽  
pp. 12416-12424 ◽  
Author(s):  
Dien Li ◽  
Chen Xu ◽  
Chris M. Yeager ◽  
Peng Lin ◽  
Wei Xing ◽  
...  
Keyword(s):  
Humic Acid ◽  
Absorption Spectroscopy ◽  
Molecular Interaction ◽  
X Ray ◽  
Iodine Species ◽  
X Ray Absorption

scholarly journals Carboxylate Functional Groups Mediate Interaction with Silver Nanoparticles in Biofilm Matrix

ACS Omega ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 724-733 ◽  
Author(s):  
Olga Sambalova ◽  
Kerstin Thorwarth ◽  
Norbert Victor Heeb ◽  
Davide Bleiner ◽  
Yucheng Zhang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Functional Groups ◽  
Biofilm Matrix

scholarly journals Optimization of biogenic synthesis of silver nanoparticles from flavonoid-rich Clinacanthus nutans leaf and stem aqueous extracts

2020 ◽  
Vol 7 (7) ◽  
pp. 200065 ◽  
Author(s):  
Siti Nur Aishah Mat Yusuf ◽  
Che Nurul Azieyan Che Mood ◽  
Nor Hazwani Ahmad ◽  
Doblin Sandai ◽  
Chee Keong Lee ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Functional Groups ◽  
Silver Ions ◽  
Cost Effective ◽  
Aqueous Extracts ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
The Face ◽  
Clinacanthus Nutans

Background : Silver nanoparticles (AgNPs) are widely used in food industries, biomedical, dentistry, catalysis, diagnostic biological probes and sensors. The use of plant extract for AgNPs synthesis eliminates the process of maintaining cell culture and the process could be scaled up under a non-aseptic environment. The purpose of this study is to determine the classes of phytochemicals, to biosynthesize and characterize the AgNPs using Clinacanthus nutans leaf and stem extracts. In this study, AgNPs were synthesized from the aqueous extracts of C. nutans leaves and stems through a non-toxic, cost-effective and eco-friendly method. Results : The formation of AgNPs was confirmed by UV-Vis spectroscopy, and the size of AgNP-L (leaf) and AgNP-S (stem) were 114.7 and 129.9 nm, respectively. Transmission electron microscopy (TEM) analysis showed spherical nanoparticles with AgNP-L and AgNP-S ranging from 10 to 300 nm and 10 to 180 nm, with average of 101.18 and 75.38 nm, respectively. The zeta potentials of AgNP-L and AgNP-S were recorded at −42.8 and −43.9 mV. X-ray diffraction analysis matched the face-centred cubic structure of silver and was capped with bioactive compounds. Fourier transform infrared spectrophotometer analysis revealed the presence of few functional groups of phenolic and flavonoid compounds. These functional groups act as reducing agents in AgNPs synthesis. Conclusion : These results showed that the biogenically synthesized nanoparticles reduced silver ions to silver nanoparticles in aqueous condition and the AgNPs formed were stable and less toxic.

Sign in / Sign up

Export Citation Format

Share Document