scholarly journals Phytonanofabrication: Methodology and Factors Affecting Biosynthesis of Nanoparticles

2020 ◽  
Author(s):  
Bipin D. Lade ◽  
Arti S. Shanware
Keyword(s):  
Silver Nanoparticles ◽  
Large Scale ◽  
Leaf Extract ◽  
Nanoparticle Synthesis ◽  
Biological Synthesis ◽  
Dark Light ◽  
Factors Affecting ◽  
Extracellular Biosynthesis ◽  
Stirring Time ◽  
The Impact

The greener way of producing silver nanoparticles is the easiest, cheapest and most efficient way of producing large-scale nanoparticles that have no adverse effect on the environment. The nanosynthesis using various methodologies and the biological synthesis of silver nanoparticles have been discussed in detail. Plant extracts have been known to be competent for the extracellular biosynthesis of silver nanoparticles suggested by the various publications. Further, effects of various sources and methods on nanoparticle synthesis have been examined. Additionally, the impact of conditions such as dark, light, heating, boiling, sonication, autoclave on the size and shape of colloidal nanoparticles has been analyzed. Moreover, effects of specific parameters such as leaf extract concentration, AgNO3, reaction temperature, pH, light and stirring time for nanoparticle synthesis are discussed, and the impact of silver nanoparticles on plant physiology has examined.

scholarly journals Green synthesis of silver nanoparticles using leaf extract from Tabebuia roseoalba and T. pentaphylla

2019 ◽  
pp. 216-222
Author(s):  
Laureen Michelle Houllou ◽  
Robson Antonio Barbosa De Souza ◽  
Carolina Barbosa Malafaia ◽  
Débora Lorrane Montenegro da Paixão ◽  
Alisson Tito Bezerra de Araújo ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Biological Activities ◽  
Nanoparticle Synthesis ◽  
Biological Synthesis ◽  
Natural Conditions ◽  
Synthesis Solution

Metal nanoparticles are nanostructures that can be applied to biotechnology because they present different biological activities. Among them, the silver nanoparticles (AgNPs) are known to present antimicrobial activity allowing their application in several areas such as medicine and industry. The biological synthesis of AgNPs is ecologically correct and advantageous techniques. The objective of this work was to evaluate the synthesis of AgNps through the green synthesis using extracts of leaves of Tabebuia roseoalba and T. pentaphylla grown in vivo and in vitro. The nanoparticle synthesis solution was colorimetrically evaluated, and the nanoparticles were physically characterized. The results obtained demonstrate that both extracts of both Tabebuia species tested are able to synthesize AgNPs, however only when cultured under in vivo conditions. These data suggest that photosynthesis under natural conditions promotes the production of metabolites that are essential to green synthesis.

Synthesis and Characterization of Silver Nanoparticles from Psidium Guajava Leaf Extract

2021 ◽  
Vol 14 (5) ◽  
pp. 5634-5638
Author(s):  
Sruthi Radhakrishnan
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Leaf Extract ◽  
Nanoparticle Synthesis ◽  
Ethanolic Extract ◽  
Psidium Guajava ◽  
Sem Analysis ◽  
Synthesis Of Nanoparticles ◽  
Elemental Silver ◽  
Ft Ir

Green route for the synthesis of nanoparticles has become more acceptable than the other chemical as well as biological route. In the present study, silver nanoparticle is synthesized using ethanolic extract of Psidium guajava leaves. Further the synthesized silver nanoparticles were characterized by UV-Visible Spec, FT-IR, X-Ray Diffraction FESEM and E-DAX. The results of FT-IR provided evidence of the involvement of phytochemicals present in the leaf extract in the reduction of silver nitrate to silver nanoparticles. XRD confirmed the crystalline structure as well as shape of the synthesized nanoparticle as face-centred cubic. E-DAX profiling helped in determining the presence of elemental silver. The size of the nanoparticle procured by SEM analysis was found to be approximately 30-50 nm in size. Thus, the findings of this study showed that the plant assisted method for silver nanoparticle synthesis is more effective and further application level studies can shed lights on their use in healing of various human ailments.   

Biological Synthesis of Silver Nanoparticles and their Biomedical Activity: A Review

2021 ◽  
Vol 09 ◽  
Author(s):  
Sarvat Zafar ◽  
Aiman Zafar ◽  
Fakhra Jabeen ◽  
Miad Ali Siddiq
Keyword(s):  
Silver Nanoparticles ◽  
Large Scale ◽  
Scale Up ◽  
Cost Effective ◽  
Biological Properties ◽  
Single Step ◽  
Biological Synthesis ◽  
Nanosized Particles ◽  
Environment Friendly ◽  
Physical And Chemical

: Nanotechnology studies the various phenomena of physio-chemical procedures and biological properties for the generation of nanosized particles, and their rising challenges in the various sectors, like medicine, engineering, agriculture, electronic, and environmental studies. The nanosized particles exhibit good anti-microbial, anti-inflammatory, cytotoxic, drug delivery, anti-parasitic, anti-coagulant and catalytic properties because of their unique dimensions with large surface area, chemical stability and higher binding density for the accumulation of various bio-constituents on their surfaces. Biological approaches for the synthesis of silver nanoparticles (AgNPs) have been reviewed because it is an easy and single-step protocol and a viable substitute for the synthetic chemical-based procedures. Physical and chemical approaches for the production of AgNPs are also mentioned herein. Biological synthesis has drawn attention because it is cost-effective, faster, non-pathogenic, environment-friendly, easy to scale-up for large-scale synthesis, and having no demand for usage of high pressure, energy, temperature, or noxious chemical ingredients, and safe for human therapeutic use. Therefore, the collaboration of nanomaterials with bio-green approaches could extend the utilization of biological and cytological properties compatible with AgNPs. In this perspective, there is an immediate need to develop ecofriendly and biocompatible techniques, which strengthen efficacy against microbes and minimize toxicity for human cells. The present study introduces the biological synthesis of silver nanoparticles, and their potential biomedical applications have also been reviewed.

Biological synthesis of silver nanoparticles from leaf extract of Piper betel and its antibacterial activities

2020 ◽  
Author(s):  
Hannah Cynthia Samuel ◽  
Saraswathy Nachimuthu ◽  
Balaji Sadhasivam ◽  
Ramalingam Ponnusamy
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Antibacterial Activities ◽  
Biological Synthesis

Biological Synthesis of Nanosilver by Using Plants

2015 ◽  
Vol 1109 ◽  
pp. 30-34 ◽  
Author(s):  
M.K. Nahar ◽  
Zarina Zakaria ◽  
U. Hashim ◽  
Md Fazlul Bari
Keyword(s):  
Silver Nanoparticles ◽  
Green Chemistry ◽  
Metallic Nanoparticles ◽  
Large Scale ◽  
Cost Effective ◽  
High Energy ◽  
Vital Role ◽  
Environmentally Benign ◽  
Biological Synthesis ◽  
Promising Area

Nanotechnology is a most promising area that is increasing day by day and play a vital role in environments, biotechnological and biomedical fields. In recent years, the development of effective green chemistry methods for synthesis of various metal nanoparticles has become a main focus of researchers. They have investigated to find out a sustainable technique for production of well-characterized nanoparticles. A variety of chemical and physical methods have been exploited in the synthesis of silver nanoparticles (AgNPs) and these procedures remain expensive, high energy consumption and involve the use of hazardous chemicals. Therefore, there is an essential need to develop environmentally benign and sustainable procedures for synthesis of metallic nanoparticles. Increasing awareness of green chemistry and biological processes has need to develop a rapid, simple, cost-effective and eco-friendly methods. One of the most considered methods is production of nanosilver using plants and plant-derived materials which is the best candidates and suitable for large-scale biosynthesis of silver nanoparticles. Eco-friendly bio-organisms in plant extracts contain proteins, which act as both capping and reducing agents forming of stable and shape-controlled AgNPs. This review describes the recent advancements in the green synthesis of silver nanoparticles by using plants.

scholarly journals Key factors affecting people’s unwillingness to be confined during the COVID-19 pandemic in Spain: a large-scale population study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marina Martinez-Garcia ◽  
Alejandro Rabasa ◽  
Xavier Barber ◽  
Kristina Polotskaya ◽  
Kristof Roomp ◽  
...  
Keyword(s):  
Large Scale ◽  
Psychological Impact ◽  
Important Variable ◽  
Policy Makers ◽  
Factors Affecting ◽  
Time Period ◽  
Economic Support ◽  
Gender And Age ◽  
Scale Population ◽  
The Impact

AbstractPopulation confinements have been one of the most widely adopted non-pharmaceutical interventions (NPIs) implemented by governments across the globe to help contain the spread of the SARS-CoV-2 virus. While confinement measures have been proven to be effective to reduce the number of infections, they entail significant economic and social costs. Thus, different policy makers and social groups have exhibited varying levels of acceptance of this type of measures. In this context, understanding the factors that determine the willingness of individuals to be confined during a pandemic is of paramount importance, particularly, to policy and decision-makers. In this paper, we study the factors that influence the unwillingness to be confined during the COVID-19 pandemic by the means of a large-scale, online population survey deployed in Spain. We perform two types of analyses (logistic regression and automatic pattern discovery) and consider socio-demographic, economic and psychological factors, together with the 14-day cumulative incidence per 100,000 inhabitants. Our analysis of 109,515 answers to the survey covers data spanning over a 5-month time period to shed light on the impact of the passage of time. We find evidence of pandemic fatigue as the percentage of those who report an unwillingness to be in confinement increases over time; we identify significant gender differences, with women being generally less likely than men to be able to sustain long-term confinement of at least 6 months; we uncover that the psychological impact was the most important factor to determine the willingness to be in confinement at the beginning of the pandemic, to be replaced by the economic impact as the most important variable towards the end of our period of study. Our results highlight the need to design gender and age specific public policies, to implement psychological and economic support programs and to address the evident pandemic fatigue as the success of potential future confinements will depend on the population’s willingness to comply with them.

Antibacterial properties of biosynthesized silver nano particles

2020 ◽  
Vol 4 (1) ◽  
pp. 1-5
Author(s):  
Krishna Reddy BV ◽  
Avinash Kumar G ◽  
Nageswara Rao G
Keyword(s):  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Large Scale ◽  
Leaf Extract ◽  
Antibacterial Agents ◽  
Uv Spectroscopy ◽  
Antibacterial Properties ◽  
Nano Particles ◽  
Lannea Coromandelica ◽  
Cost Efficacy

Nanoparticles have their demand in various fields of science and technology and their applications extend even in medical and pharmaceutical arena. They have been used as preservatives, diagnosing aids and potent antibacterial agents. But their production is a serious matter of concern when it comes to cost, efficacy and toxicity issues. Overcoming these limitations green synthesis has taken its advantage for their commercial and large scale synthesis. This research will focus on the preparation of nano particles of silver with the help of purified leaf extract from Lannea coromandelica and evaluation of the same using UV-Vis Spectrophotometry. The nanoparticles exhibited surface plasmon resonance at 420nm in UV spectroscopy. Futhermore, nanoparticles have been evaluated for their antibacterial activity on Putida vulgaris, Staphylococcus aureus, and Bacillus subtillis. The results proved the eco friendly synthesized silver nanoparticles have a good antibacterial and can be used effectively in therapies targeting infections and infectious wounds.

Biogenic synthesis of Silver Nanoparticles using Azadirachta indica (Neem) leaf extract targeting inhibitory action against antibiotic resistance bacteria

2021 ◽  
Vol 19 ◽  
Author(s):  
Moinuzzaman ◽  
Mohammad Abu Hena Mostofa Jamal ◽  
Helal Uddin ◽  
Shahedur Rahman ◽  
Abdul Momin ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibiotic Resistance ◽  
Azadirachta Indica ◽  
Metal Ion ◽  
Leaf Extract ◽  
Biomedical Application ◽  
Fixed Ratio ◽  
Biomedical Science ◽  
Biological Synthesis ◽  
Neem Leaf Extract

Background: In new modern science Nanotechnology is an emerging field for the researchers. Nanotechnology deals with the Nanoparticles. These Nanoparticles have a size of 1-100 nm in one dimension which are important part of biomedical science and medical chemistry, atomic physics, and all other known fields. Nanoparticles are used in broad range due to its small size, orientation, physical properties. Objectives: This study was designed to synthesized Silver nanoparticles using Azadirachta indica (Neem) leaf extract and evaluate biomedical application. Methods: Aqueous extract of Azadirachta indica is used for the synthesis of AgNPs. 1ml of the extract was added to (30- 60) ml of 1mM solution of silver nitrate drop by drop. Silver nanoparticle was characterized by UV-Visible Spectroscopy, Fourier Transform Infrared Spectroscopy, Dynamic Light Scattering Spectroscopy, X-ray Diffraction, Transmission Electron Microscopy, Antibacterial activity studies. Results: The Biological synthesis of Silver nanoparticles (AgNPs) was done by using the aqueous solution of Azadirachta indica leaf extract and AgNO3. A fixed ratio of plant extract to metal ion was used to prepare AgNPs and the formation of the nanoparticles was observed by the color change. The nanoparticles were characterized by UV-vis Spectrophotometer, FTIR, DLS, XRD and TEM. The nanoparticles were found have the size ranges from 30-60 nm. The biosynthesized silver nanoparticles had bactericidal effect against antibiotic resistance pathogenic microorganisms such as Bascillus subtilis, pseudomonas aeruginosa and Bascillus cereus. Conclusion: Silver nanoparticles were synthesized by Azadirachta indica leaf extract can be used as a therapeutic candidate for biomedical applications.

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