Host–guest recognition-induced color change of water-soluble pillar[5]arene modified silver nanoparticles for visual detection of spermine analogues

2014 ◽  
Vol 50 (7) ◽  
pp. 869-871 ◽  
Author(s):  
Yong Yao ◽  
Yujuan Zhou ◽  
Jing Dai ◽  
Shiyu Yue ◽  
Min Xue
Keyword(s):  
Silver Nanoparticles ◽  
Visual Detection ◽  
Color Change ◽  
Water Soluble ◽  
Spermine Analogues

scholarly journals Molecular-Based Identification of Actinomycetes Species That Synthesize Antibacterial Silver Nanoparticles

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Abebe Bizuye ◽  
Lashitew Gedamu ◽  
Christine Bii ◽  
Erastus Gatebe ◽  
Naomi Maina
Keyword(s):  
Silver Nanoparticles ◽  
16S Rrna ◽  
16S Rrna Gene ◽  
Functional Groups ◽  
Visual Detection ◽  
Color Change ◽  
Bioactive Metabolites ◽  
Resistant Bacteria ◽  
Rrna Gene ◽  
Genus Streptomyces

Infectious diseases caused by antibiotic-resistant bacteria lead to a considerable increase in human morbidity and mortality globally. This requires to search potential actinomycete isolates from undiscovered habitats as a source of effective bioactive metabolites and to synthesis metabolite-mediated antibacterial silver nanoparticles (AgNPs). The main purpose of the present study was to identify actinomycetes isolated from Thika waste dump soils that produce bioactive metabolites to synthesize antibacterial AgNPs. The synthesis of metabolite-mediated AgNP was confirmed with visual detection and a UV-vis spectrophotometer, whereas the functional groups involved in AgNP synthesis were identified using a FTIR spectrophotometer. The antibacterial activity of the metabolite-mediated AgNPs was tested by a well diffusion assay. Identification of actinomycete isolates involved in the synthesis of antibacterial AgNPs was done based on 16S rRNA gene sequence analysis. The visual detection showed that dark salmon and pale golden color change was observed due to the formation of AgNPs by KDT32 and KGT32 metabolites, respectively. The synthesis was confirmed by a characteristic UV spectra peak at 415.5 nm for KDT32-AgNP and 416 nm for KGT32-AgNP. The FTIR spectra revealed that OH, C=C, and S-S functional groups were involved in the synthesis of KDT32-AgNP, whereas OH, C=C, and C-H were involved in the formation of KGT32-AgNP. The inhibition zone results revealed that KDT32-AgNP showed 22.0 ± 1.4 mm and 19.0 ± 1.4 mm against Escherichia coli and Salmonella typhi, whereas KGT32-AgNP showed 21.5 ± 0.7 mm and 17.0 ± 0.0 mm, respectively. KDT32 and KGT32 isolates were identified as genus Streptomyces and their 16S rRNA gene sequences were deposited in the GenBank database with MH301089 and MH301090 accession numbers, respectively. Due to the bactericidal activity of synthesized AgNPs, KDT32 and KGT32 isolates can be used in biomedical applications.

Efficacy of Silver Nanoparticles Synthesized from Hymenocallis species (Spider Lilly) Leaf Extract as Antimicrobial Agents

2019 ◽  
Vol 12 (5) ◽  
pp. 4644-4647
Author(s):  
K.K. Gupta ◽  
Neha Kumari ◽  
Neha Sinha ◽  
Akruti Gupta
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Antimicrobial Agents ◽  
Color Change ◽  
Bacterial Species ◽  
Antimicrobial Property ◽  
Biogenic Synthesis ◽  
E Coli ◽  
Light Yellow ◽  
Antibiotic Property

Biogenic synthesis of silver nanoparticles synthesized from Hymenocallis species (Spider Lilly) leaf extract was subjected for investigation of its antimicrobial property against four bacterial species (E. coli, Salmonella sp., Streptococcus sp. & Staphylococcus sp.). The results revealed that synthesized nanoparticles solution very much justify the color change property from initial light yellow to final reddish brown during the synthesis producing a characteristics absorption peak in the range of 434-466 nm. As antimicrobial agents, their efficacy was evaluated by analysis of variance in between the species and among the different concentration of AgNPs solution, which clearly showed that there was significant variation in the antibiotic property between the four different concentrations of AgNPs solution and also among four different species of bacteria taken under studies. However, silver nanoparticles solution of 1: 9 and 1:4 were proved comparatively more efficient as antimicrobial agents against four species of bacteria.

scholarly journals The Synergistic Effect of Biosynthesized Silver Nanoparticles and Phage ZCSE2 as a Novel Approach to Combat Multidrug-Resistant Salmonella enterica

Antibiotics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 678
Author(s):  
Abdallah S. Abdelsattar ◽  
Rana Nofal ◽  
Salsabil Makky ◽  
Anan Safwat ◽  
Amera Taha ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Color Change ◽  
Antibacterial Properties ◽  
Multidrug Resistant ◽  
Inhibitory Effect ◽  
Health Concern ◽  
Resistant Bacteria ◽  
Mortality And Morbidity ◽  
Novel Approach ◽  
Transmission Electron

The emergence and evolution of antibiotic-resistant bacteria is considered a public health concern. Salmonella is one of the most common pathogens that cause high mortality and morbidity rates in humans, animals, and poultry annually. In this work, we developed a combination of silver nanoparticles (AgNPs) with bacteriophage (phage) as an antimicrobial agent to control microbial growth. The synthesized AgNPs with propolis were characterized by testing their color change from transparent to deep brown by transmission electron microscopy (TEM) and Fourier-Transform Infrared Spectroscopy (FTIR). The phage ZCSE2 was found to be stable when combined with AgNPs. Both minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were evaluated for AgNPs, phage, and their combination. The results indicated that MIC and MBC values were equal to 23 µg/mL against Salmonella bacteria at a concentration of 107 CFU/mL. The combination of 0.4× MIC from AgNPs and phage with Multiplicity of Infection (MOI) 0.1 showed an inhibitory effect. This combination of AgNPs and phage offers a prospect of nanoparticles with significantly enhanced antibacterial properties and therapeutic performance.

Visual detection of carbonate ions by inverse opal photonic crystal polymers in aqueous solution

2015 ◽  
Vol 3 (37) ◽  
pp. 9524-9527 ◽  
Author(s):  
Lu Li ◽  
Bin Zhao ◽  
Yue Long ◽  
Jin-Ming Gao ◽  
Guoqiang Yang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photonic Crystal ◽  
Polymer Films ◽  
Visual Detection ◽  
Color Change ◽  
Ph Dependence ◽  
Inverse Opal ◽  
Carbonate Ions ◽  
Crystal Polymer

This communication demonstrates a facile method to detect CO32− by naked eyes through color change based on the pH dependence of inverse opal photonic crystal polymer films.

Water Soluble Silver Nanoparticles Functionalized with Thiolate

1999 ◽  
Vol 28 (11) ◽  
pp. 1169-1170 ◽  
Author(s):  
Sihai Chen ◽  
Keisaku Kimura
Keyword(s):  
Silver Nanoparticles ◽  
Water Soluble

scholarly journals A Novel Photosynthesis of Carboxymethyl Starch-Stabilized Silver Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
M. A. El-Sheikh
Keyword(s):  
Silver Nanoparticles ◽  
Room Temperature ◽  
Colloidal Solution ◽  
Synthesis Method ◽  
Silver Ions ◽  
Water Soluble ◽  
Synthesis Process ◽  
Carboxymethyl Starch ◽  
Round Shape ◽  
First Time

The water soluble photoinitiator (PI) 4-(trimethyl ammonium methyl) benzophenone chloride is used for the first time in the synthesis of silver nanoparticles (AgNPs). A new green synthesis method involves using PI/UV system, carboxymethyl starch (CMS), silver nitrate, and water. A mechanism of the reduction of silver ions to AgNPs by PI/UV system as well as by the newly born aldehydic groups was proposed. The synthesis process was assessed by UV-vis spectra and TEM of AgNPs colloidal solution. The highest absorbance was obtained using CMS, PI and AgNO3concentrations of 10 g/L, 1 g/L, and 1 g/L, respectively; 40°C; 60 min; pH 7; and a material : liquor ratio 1 : 20. AgNPs so-obtained were stable in aqueous solution over a period of three weeks at room temperature (~25°C) and have round shape morphology. The sizes of synthesized AgNPs were in the range of 1–21 nm and the highest counts % of these particles were for particles of 6–10 and 1–3 nm, respectively.

scholarly journals Green Synthesis of Silver Nanoparticles Using Melia Azedarach and its Characterization, Corrosion and Antibacterial Properties

2020 ◽  
Vol 11 (1) ◽  
pp. 8577-8586
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Color Change ◽  
Nitrate Solution ◽  
Antibacterial Properties ◽  
Nanoparticle Synthesis ◽  
Silver Nitrate Solution ◽  
Xrd Analysis ◽  
Melia Azedarach ◽  
Change State

Nanoparticle synthesis by the biological method is economical and environmentally friendly. In the present study, the biosynthesis of silver nanoparticles is performed by using extracts of Melia Azedarach plant leaves. The synthesis is performed by adding to the silver nitrate solution to the leaf extract of Melia azedarach. The color change state the precipitation of nanoparticles of silver. The silver nanoparticles obtained were characterized by various techniques such as X-ray diffraction (XRD), Scanning electron microscope (SEM), transmission electron microscope (TEM), and Energy dispersive spectroscopy (EDX). The XRD analysis shows the particle size of 11 nm calculated by the Debye-Scherrer. The microstructure analysis shows silver particles of spherical and triangular. The corrosion rate was found to be 0.025 mpy. The green silver nanoparticle (AgNPs) synthesized have better antimicrobial potential against both bacteria’s (Bacillus subtilis and Pseudomonas aeruginosa).

Silver nanoparticles modified by water-soluble leaning tower[6]arenes for sensing and catalysis

2021 ◽  
Author(s):  
Yi-Nan Zhang ◽  
Zheng Li ◽  
Suriguga Meng ◽  
Alideertu Dong ◽  
Ying-Wei Yang
Keyword(s):  
Silver Nanoparticles ◽  
Hybrid Material ◽  
Water Soluble ◽  
One Pot ◽  
Sodium Salts ◽  
Good Dispersion ◽  
One Pot Synthesis ◽  
The One ◽  
Excellent Stability

Carboxylated leaning tower[6]arene sodium salts are used as an efficient stabiliser for the one-pot synthesis of silver nanoparticles. The resulting hybrid material with good dispersion, excellent stability and narrow size...

Development, Characterization and Anticancer Evaluation of Silver Nanoparticles from Dalbergia sissoo Leaf Extracts

2020 ◽  
Vol 16 (2) ◽  
pp. 145-151
Author(s):  
Aakash Deep ◽  
Mitali Verma ◽  
Rakesh K. Marwaha ◽  
Arun K. Sharma ◽  
Beena Kumari
Keyword(s):  
Silver Nanoparticles ◽  
Anticancer Activity ◽  
Metal Ion ◽  
Color Change ◽  
Fixed Ratio ◽  
Cancer Cell Line ◽  
Dalbergia Sissoo ◽  
Leaf Extracts ◽  
Standard Drug

Aim: The objective behind this present work is the development and characterization of silver nanoparticles from Dalbergia sissoo leaf extracts and the analysis of anticancer activity. Methods: Silver nanoparticles were prepared by using the aqueous solution of Dalbergia sisoo leaf extract and silver nitrate. The formation of nanoparticles was determined by the color change during the preparation of plant extract to metal ion in a fixed ratio. The prepared nanoparticles were then characterized by TEM, FTIR, DLS, XRD, and SEM. Silver nanoparticles were also evaluated for anticancer activity. Results: Synthesized silver nanoparticles were having good anticancer activity against MCF 7 cancer cell line as compared to the standard drug Doxorubicin. Conclusion: The particle size of nanoparticles was found to lie in the range of 10 to 50 nm.

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