scholarly journals Environmentally Safe Biosynthesis of Gold Nanoparticles Using Plant Water Extracts

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2033
Author(s):  
Mohadeseh Hassanisaadi ◽  
Gholam Hosein Shahidi Bonjar ◽  
Abbas Rahdar ◽  
Sadanand Pandey ◽  
Akbar Hosseinipour ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Plant Species ◽  
Color Change ◽  
Scale Up ◽  
High Tech ◽  
Safe Procedure ◽  
Leaf Petiole ◽  
Water Extracts ◽  
Middle East Countries ◽  
Environmentally Safe

Due to their simplicity of synthesis, stability, and functionalization, low toxicity, and ease of detection, gold nanoparticles (AuNPs) are a natural choice for biomedical applications. AuNPs’ unique optoelectronic features have subsequently been investigated and used in high-tech applications such as organic photovoltaics, sensory probes, therapeutic agents, the administration of drugs in biological and medical applications, electronic devices, catalysis, etc. Researchers have demonstrated the biosynthesis of AuNPs using plants. The present study evaluates 109 plant species used in the traditional medicine of Middle East countries as new sources of AuNPs in a wide variety of laboratory environments. In this study, dried samples of bark, bulb, flower, fruit, gum, leaf, petiole, rhizome, root, seed, stamen, and above-ground parts were evaluated in water extracts. About 117 plant parts were screened from 109 species in 54 plant families, with 102 extracts demonstrating a bioreduction of Au3+ to Au0, revealing 37 new plant species in this regard. The color change of biosynthesized AuNPs to gray, violet, or red was confirmed by UV-Visible spectroscopy, TEM, FSEM, DLS, and EDAX of six plants. In this study, AuNPs of various sizes were measured from 27 to 107 nm. This study also includes an evaluation of the potency of traditional East Asian medicinal plants used in this biosynthesis of AuNPs. An environmentally safe procedure such as this could act as a foundation for cosmetic industries whose quality assessment systems give a high priority to non-chemically synthesized products. It is crucial that future optimizations are adequately documented to scale up the described process.

Visual detection of 8-OHdG based on the aggregation of gold nanoparticles capped with the anti-8-OHdG antibody

2015 ◽  
Vol 7 (19) ◽  
pp. 8360-8365 ◽  
Author(s):  
Liping Wu ◽  
Wendan Pu ◽  
Yue Liu ◽  
Huawen Zhao ◽  
Weiqun Shu
Keyword(s):  
Gold Nanoparticles ◽  
Quantitative Determination ◽  
Rapid Method ◽  
Visual Detection ◽  
Color Change ◽  
Naked Eye ◽  
Absorption Wavelength

AuNPs, capped with anti-8-OHdG antibody, aggregate when 8-OHdG was added, resulting in color change and redshift of absorption wavelength. So a simple and rapid method to selectively determine 8-OHdG was developed and semi-quantitative determination could be achieved by the naked eye.

Preparation of Poly(Acrylic Acid) Crosslinked-Gold Nanoparticles for Colorimetric Detection of Analytes

2019 ◽  
Vol 950 ◽  
pp. 138-143
Author(s):  
Erindyah Retno Wikantyasning ◽  
Mutmainnah Mutmainnah ◽  
Ghiyats Ramadhan ◽  
Zakky Cholisoh ◽  
Muhammad Da'i
Keyword(s):  
Gold Nanoparticles ◽  
Herbal Medicine ◽  
Acrylic Acid ◽  
Color Change ◽  
Colorimetric Detection ◽  
Ph Responsive ◽  
Herbal Medicine Product ◽  
Responsive Polymer ◽  
Medicine Product ◽  
Poly Acrylic Acid

The aims of this study are to synthesize and characterize gold nanoparticles (AuNPs) crosslinked by pH-responsive polymer poly (acrylic acid) (PAA) and its application for detection of some analytes in herbal medicine product. In this study, a pH-responsive polymer, poly (acrylic acid) was prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization method. The polymer was then cross-linked by gold nanoparticles, which was synthesized by the Turkevich method. The response of the AuNPs-crosslinked PAA was observed by the color change from red to blue at a specific pH (4-5) and was characterized by TEM. The reversible color change was resulted from aggregation and disaggregation of the AuNPs due to the shrinking and swelling of the polymer when different pH was introduced as a stimulant. This sensor has the capability of recognizing analytes such as aspirin and tolbutamide added in the herbal medicine product at the concentration of 0.04-0.05 M.

scholarly journals Facile and One Pot Synthesis of Gold Nanoparticles Using Tetraphenylborate and Polyvinylpyrrolidone for Selective Colorimetric Detection of Mercury Ions in Aqueous Medium

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Sidhureddy Boopathi ◽  
Shanmugam Senthilkumar ◽  
Kanala Lakshminarasimha Phani
Keyword(s):  
Gold Nanoparticles ◽  
Alkaline Medium ◽  
Color Change ◽  
Colorimetric Detection ◽  
Spherical Shape ◽  
Reducing Agent ◽  
Nanoparticle Dispersion ◽  
Mercury Ions ◽  
One Pot ◽  
Resonance Band

In this work, we reported for the first time, a facile and one step synthesis of gold nanoparticles from HAuCl4, employing tetraphenylborate as the reducing agent. The synthesis is not only facile but also yields “dumb-bell-shaped”particles. This shape appears to arise from a possible emulsion of the products of oxidation/decomposition of tetraphenylborate by HAuCl4, surrounding the particle. The size and shape of the AuNPs were characterized by Transmission electron microscopy (TEM) and UV-visible Spectroscopy. Interestingly, the addition of polyvinylpyrrolidone (PVP) during the synthesis was found to enhance the stability of the nanoparticle dispersion. The particles synthesized under these conditions assume “spherical” shape with the appearance of only transverse surface plasmon resonance band. The highlight of the observations is that the gold nanoparticles synthesized using tetraphenylborate as reducing agent and PVP as stabilizer are highly stable in alkaline medium, in contrast to the synthesis wherein borohydride is used as reducing agent. The AuNPs synthesized using tetraphenylborate and PVP show their mercury sensing behavior only in the alkaline medium. The color of the nanoparticle dispersion undergoes distinct color change from pink to blue with the addition of mercury ions. They also show dramatic selectivity to mercury ions in presence of other interfering ions, Pb2+, Zn2+and Ca2+.

Gold nanoparticles functionalized with 2,6-dimercaptopurine for sensitive and selective colorimetric determination of cadmium(ii) in food, biological and environmental samples

2017 ◽  
Vol 9 (38) ◽  
pp. 5598-5603 ◽  
Author(s):  
M. H. Hu ◽  
W. H. Huang ◽  
L. L. Suo ◽  
L. H. Zhou ◽  
L. F. Ma ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Environmental Samples ◽  
Color Change ◽  
Colorimetric Determination ◽  
Biological And Environmental Samples

The proposed method can recognize Cd2+in different samples based on the aggregation of DMP-AuNPs, resulting in a color change.

scholarly journals A Highly Sensitive and Selective Colorimetric Hg2+ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Kyung Min Kim ◽  
Yun-Sik Nam ◽  
Yeonhee Lee ◽  
Kang-Bong Lee
Keyword(s):  
Gold Nanoparticles ◽  
Secondary Ion Mass Spectrometry ◽  
Color Change ◽  
Colorimetric Assay ◽  
Tap Water ◽  
Interparticle Distance ◽  
Pond Water ◽  
Assay Method ◽  
Tuna Fish ◽  
Highly Sensitive

A highly sensitive and selective colorimetric assay for the detection of Hg2+ ions was developed using gold nanoparticles (AuNPs) conjugated with polyethyleneimine (PEI). The Hg2+ ion coordinates with PEI, decreasing the interparticle distance and inducing aggregation. Time-of-flight secondary ion mass spectrometry showed that the Hg2+ ion was bound to the nitrogen atoms of the PEI in a bidentate manner (N–Hg2+–N), which resulted in a significant color change from light red to violet due to aggregation. Using this PEI-AuNP probe, determination of Hg2+ ion can be achieved by the naked eye and spectrophotometric methods. Pronounced color change of the PEI-AuNPs in the presence of Hg2+ was optimized at pH 7.0, 50°C, and 300 mM·NaCl concentration. The absorption intensity ratio (A700/A514) was correlated with the Hg2+ concentration in the linear range of 0.003–5.0 μM. The limits of detection were measured to be 1.72, 1.80, 2.00, and 1.95 nM for tap water, pond water, tuna fish, and bovine serum, respectively. Owing to its facile and sensitive nature, this assay method for Hg2+ ions can be applied to the analysis of water and biological samples.

PLASMON ABSORPTION OF GOLD NANOPARTICLES AND THEIR MORPHOLOGIES OBSERVED BY AFM

1996 ◽  
Vol 03 (01) ◽  
pp. 1153-1156 ◽  
Author(s):  
H. ISHIKAWA ◽  
T. IDA ◽  
K. KIMURA
Keyword(s):  
Heat Treatment ◽  
Gold Nanoparticles ◽  
Atomic Force Microscopy ◽  
Absorption Spectrum ◽  
Color Change ◽  
Island Film ◽  
Plasmon Absorption ◽  
Force Microscopy ◽  
Atomic Force

We have studied the effect of heat treatment on Au-island film prepared by a sputtering method, atomic force microscopy (AFM), and UV-VIS spectrophotometry. The structure and absorption spectrum of Au-island film are significantly changed by heat treatment, which corresponds to the visible color change from blue to red. In order to elucidate the relation between the structural and optical changes, we have simulated the change of spectrum using the Maxwell-Garnett theory. The calculated spectra are qualitatively in agreement with the experimental spectra.

A universal strategy for visual chiral recognition of α-amino acids with l-tartaric acid-capped gold nanoparticles as colorimetric probes

The Analyst ◽  
2016 ◽  
Vol 141 (4) ◽  
pp. 1257-1265 ◽  
Author(s):  
Guoxin Song ◽  
Fulin Zhou ◽  
Chunli Xu ◽  
Baoxin Li
Keyword(s):  
Amino Acids ◽  
Gold Nanoparticles ◽  
Tartaric Acid ◽  
Chiral Recognition ◽  
Color Change ◽  
Blue Color ◽  
Left Handed

All of 19 right-handed α-amino acids can induce a red-to-blue color change of l-tartaric acid-capped AuNP solution, whereas all of the left-handed amino acids (except cysteine) cannot.

scholarly journals In Vitro Segregation of Tetraploid and Octoploid Plantlets from Colchicine-induced Ploidy Chimeras in Echinacea purpurea L.

HortScience ◽  
2016 ◽  
Vol 51 (5) ◽  
pp. 549-557 ◽  
Author(s):  
Qingling Li ◽  
Yuesheng Yang ◽  
Hong Wu
Keyword(s):  
Plant Species ◽  
Guard Cells ◽  
Echinacea Purpurea ◽  
Source Material ◽  
Cichoric Acid ◽  
Leaf Petiole ◽  
Stunted Growth ◽  
Ploidy Chimeras ◽  
Ploidy Manipulation

Echinacea purpurea L. is one of the important ornamental and medicinal plant species. Ploidy manipulation is a valuable tool for improving plant quality or production in E. purpurea as well as in many other plants. To study the segregation of pure ploidy plantlets from colchicine-induced ploidy chimeras in E. purpurea, we used a chimera plantlet that consisted of 1.93% diploid, 35.04% tetraploid, and 63.03% octoploid cells as the source material for experiments. The results showed that three factors significantly influenced the segregation, i.e., the component ratios of different ploidy cells in the chimera, the number of sequential passages, and the methods of segregation culture of the chimera plantlets. Other factors, such as explant types (i.e., leaf, petiole, or root) and 6-benzyladenine (BA) concentrations (i.e., 0.2, 0.4, 0.8, and 1.2 mg·L−1) occasionally influenced the segregation. Pure chromosome-doubled polyploids are not easily obtained in various plant species, so segregation culture of ploidy chimeras may potentially be more effective. The morphological characteristic and content of cichoric acid were compared among diploid, tetraploid, and octoploid plants. Results indicated that tetraploid and octoploid plants had more stunted growth, larger stomata, lower stomata frequency, more chloroplast number in guard cells, and higher cichoric acid content than original diploid lines.

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