Thermosensitive antibacterial Ag nanocomposite hydrogels made by a one-step green synthesis strategy

2016 ◽  
Vol 40 (8) ◽  
pp. 6650-6657 ◽  
Author(s):  
Haoyang Jiang ◽  
Gongzheng Zhang ◽  
Bo Xu ◽  
Xianqi Feng ◽  
Quanming Bai ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Stabilizing Agent ◽  
Nanocomposite Hydrogels ◽  
Synthesis Strategy ◽  
Hydrogel Matrix ◽  
One Step

Clay nanosheets act as a catalyst and stabilizing agent for rapid in situ synthesis of silver nanoparticles in a hydrogel matrix.

Green Synthesis, Characterization and Antimicrobial Activity of Silver Nanoparticles Using Dudoa (Hydnocarpus alcalae C.DC.) Leaf Extract As a Reducing and Stabilizing Agent

2019 ◽  
Vol 4 (2) ◽  
pp. 112-124
Author(s):  
Edward K.B. Bragais ◽  
Lynne M. Labaclado
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Cost Effective ◽  
Endemic Plant ◽  
Stabilizing Agent ◽  
One Step ◽  
Ft Ir ◽  
Size And Morphology

Background and Objective: In this study, dudoa (Hydnocarpus alcalae C.DC.) leaf extract was used as a reducing and stabilizing agent in a novel one-step green synthesis of silver nanoparticles. Dudoa is an endemic plant in the province of Legazpi, Philippines and its seed oil was used as an anti-leprotic drug. Method: Therefore, the dudoa leaf extract was used to synthesize silver nanoparticles. Moreover, optimization of various parameters greatly affected the size and morphology of the synthesized AgNPs as indicated by the Ultraviolet-visible (UV-vis) spectrophotometry. The synthesized AgNPs were further characterized using spectral analyses such as XRD, EDX, SEM, FT-IR, TGA and DLS. The antimicrobial activity of synthesized AgNPs was also demonstrated. Results and Discussions: The synthesized AgNPs exhibited a diffraction pattern and a particle size ranging from 22-48 nm. The AgNPs also showed complete inhibitory and mild reactivity against representative pathogenic gram-positive (S.aureus) and gram-negative (E.coli) bacteria. Conclusion: Silver nanoparticles were successfully synthesized using H. alcalae leaf extract. Furthermore, this green synthesis approach appeared to be cost-effective, non-toxic, and eco-friendly which is a best alternative to the conventional chemical methods.

scholarly journals Green synthesis of silk sericin-embedded silver nanoparticles and their antibacterial application against multidrug-resistant pathogens

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Md. Abdullah Al Masud ◽  
Hamid Shaikh ◽  
Md. Shamsul Alam ◽  
M. Minnatul Karim ◽  
M. Abdul Momin ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Bombyx Mori ◽  
Multidrug Resistant ◽  
Visible Spectroscopy ◽  
Silk Sericin ◽  
X Ray ◽  
Synthesis Strategy ◽  
Uv Visible ◽  
Multidrug Resistant Pathogens

Abstract Background The green synthesis strategy of metallic nanoparticles (NPs) has become popular due to being environmentally friendly. Stable silver nanoparticles (AgNPs) have been synthesized by natural products such as starch, soy protein, various extract of leaves, barks, and roots functioning both as reducing and stabilizing agents. Likewise, silk sericin (SS) is a globular protein discarded in the silk factory might be used for NP synthesis. In this research, we focus on the green synthesis and stabilization of AgNPs by SS as well as assessment of their antibacterial activities against some drug-resistant pathogen. Results SS was extracted from Bombyx mori silkworm cocoons in an aqueous medium. 17 w/w% of dry sericin powder with respect to the cocoon’s weight was obtained by freeze-drying. Furthermore, AgNPs conjugated to sericin, i.e., SS-capped silver nanoparticles (SS-AgNPs) were synthesized by easy, cost-effective, and environment-friendly methods. The synthesized SS-AgNPs were characterized by UV-visible spectroscopy, Fourier-transform infrared-attenuated total reflection (FTIR-ATR) spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction measurement. It has been found from the absorbance of UV-visible spectroscopy that a higher percent of SS-AgNPs was obtained at a higher concentration of silver nitrate solution. FTIR-ATR spectra showed that the carboxylate groups obtained from silk sericin act as a reducing agent for the synthesis of silver nanoparticles, while NH2+ and COO− act as a stabilizer of AgNPs. The X-ray diffractogram of SS-AgNPs was quite different from AgNO3 and sericin due to a change in the crystal structure. The diameter of AgNPs was around 20–70 nm observed using TEM. The synthesized SS-AgNPs exhibited strong antibacterial activity against multidrug-resistant pathogens, Escherichia coli and Pseudomonas aeruginosa. Minimal inhibitory/bactericidal concentrations against E. coli and P. aeruginosa were 20μg/mL. Conclusions This study encourages the use of Bombyx mori for the ecofriendly synthesis of SS-AgNPs to control multidrug-resistant microorganisms.

One-Step In Situ Biosynthesis of Graphene Oxide-Bacterial Cellulose Nanocomposite Hydrogels

2014 ◽  
Vol 35 (19) ◽  
pp. 1706-1711 ◽  
Author(s):  
Hongjuan Si ◽  
Honglin Luo ◽  
Guangyao Xiong ◽  
Zhiwei Yang ◽  
Sudha R. Raman ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Bacterial Cellulose ◽  
Nanocomposite Hydrogels ◽  
One Step

One-step green synthesis of gold and silver nanoparticles with ascorbic acid and their versatile surface post-functionalization

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 33092-33100 ◽  
Author(s):  
Ludivine Malassis ◽  
Rémi Dreyfus ◽  
Ryan J. Murphy ◽  
Lawrence A. Hough ◽  
Bertrand Donnio ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Green Synthesis ◽  
Gold And Silver Nanoparticles ◽  
One Step ◽  
Post Functionalization

Gold and silver nanoparticles, with different sizes, have been synthesized using ascorbic acid which allows a versatile and simple post-functionalisation.

One step green synthesis of hexagonal silver nanoparticles and their biological activity

2014 ◽  
Vol 20 (6) ◽  
pp. 4473-4481 ◽  
Author(s):  
Samy M. Shaban ◽  
Ismail Aiad ◽  
Mohamed M. El-Sukkary ◽  
E.A. Soliman ◽  
Moshira Y. El-Awady
Keyword(s):  
Silver Nanoparticles ◽  
Biological Activity ◽  
Green Synthesis ◽  
One Step

Green Synthesis of Silk Sericin-Based Silver Nanoparticles

2011 ◽  
Vol 415-417 ◽  
pp. 487-490 ◽  
Author(s):  
Jia Li Ding ◽  
Wen Wu
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Room Temperature ◽  
Reduction Reaction ◽  
In Situ Reduction ◽  
Silk Sericin ◽  
Vis Spectroscopy ◽  
Highly Dispersed ◽  
Average Size

Green synthesis of silver nanoparticles (AgNPs) using the silk sericin (SS) solution by in situ reduction at room temperature is reported. The effect of pH on the reduction reaction is studied by UV-Vis spectroscopy. The structure of the sericin-based silver nanoparticles is characterized by TEM. According to the TEM images, the average size of the silver nanoparticles is about 16 nm. The silver nanoparticles are highly dispersed and stable in silk sericin solution for monthes.

A novel green synthesis approach for polymer nanocomposites decorated with silver nanoparticles and their antibacterial activity

The Analyst ◽  
2014 ◽  
Vol 139 (22) ◽  
pp. 5793-5799 ◽  
Author(s):  
Guofang Chen ◽  
Jingran Lu ◽  
Clarissa Lam ◽  
Yong Yu
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Polymer Nanocomposites ◽  
Polymer Composite ◽  
High Purity ◽  
Synthesis Strategy ◽  
Polymer Colloid ◽  
Synthesis Approach

A novel green synthesis strategy was developed for polymer composite spheres decorated with silver nanoparticles, mediated by a polymer colloid support itself, which are very stable and of high purity with excellent antibacterial activity.

Green Synthesis of Semi-IPN Hydrogel-Silver Nanocomposites by a Biotemplate Redox Technique at Room Temperature

2012 ◽  
Vol 468-471 ◽  
pp. 1974-1977
Author(s):  
Wen Wu ◽  
Dong Sheng Wang
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Silver Nitrate ◽  
Room Temperature ◽  
In Situ Reduction ◽  
X Ray Diffraction ◽  
Silk Sericin ◽  
X Ray ◽  
Silver Nanocomposites

Semi-IPN hydrogels in which silk sericin (SS) chains were physically dispersed throughout dextran (Dex) gel networks were synthesized. Highly stable distributed silver nanoparticles have been prepared using these semi-IPN hydrogels as a carrier via in situ reduction of silver nitrate without the addition of any reducing agent. The resultant semi-IPN hydrogel-silver nanocomposites were characterized by X-ray diffraction (XRD). And the swelling behavior of the hydrogles was also studied.

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