scholarly journals Biosynthesis of gold nanoparticles using psidium guajava leaf extract

2014 ◽  
Vol 9 (3) ◽  
Author(s):  
Amel Taha ◽  
Mustaffa Shamsuddin
Keyword(s):  
Gold Nanoparticles ◽  
Metal Ion ◽  
Leaf Extract ◽  
Psidium Guajava ◽  
Ion Concentration ◽  
Tem Analysis ◽  
Synthesis Of Nanoparticles ◽  
Size Of Particles ◽  
Average Size ◽  
The Cost

Nanomaterials are attracting a lot of attention nowadays as they show different chemical and physical properties that are dependent on their size and shape. Different techniques have been used for synthesis metal nanoparticles but the use of plants for synthesis of nanoparticles could be advantageous over other environmentally methods as this eliminates the cost and the non toxicity is main feature. Here a simple biosynthesis approach was applied and gold nanoparticles were synthesized by using psidium guajava leaf extract as reducing and capping agent. Two different parameters were studied which are the metal ion concentration and volume of plant broth. The synthesis of gold nanoparticles was also monitored as function of reaction time. The formation of gold nanoparticles was monitored by UV-Vis spectrophotometer and the size of particles was confirmed by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) techniques. TEM analysis showed that the AuNPs were mostly spherical in shape with an average size of 15 nm. Fourier Transform Infrared (FTIR) spectroscopy that the active biomolecules present in the Psidium guajava leaf extract act as capping and stabilizing agent for the AuNPs.

scholarly journals Biosynthesis of Gold Nanoparticles (Green-gold) Using Leaf Extract ofTerminalia Catappa

2010 ◽  
Vol 7 (4) ◽  
pp. 1334-1339 ◽  
Author(s):  
Balaprasad Ankamwar
Keyword(s):  
Gold Nanoparticles ◽  
Leaf Extract ◽  
Biomedical Application ◽  
Low Cost ◽  
Attractive Potential ◽  
Chloroauric Acid ◽  
Rapid Reduction ◽  
Tem Analysis ◽  
Terminalia Catappa ◽  
Average Size

The synthesis of eco-friendly nanoparticles is evergreen branch of nanoscience for biomedical application. Low cost of synthesis and non toxicity are main features make it more attractive potential option for biomedical field and elsewhere. Here, we report the synthesis of gold nanoparticles in aqueous medium usingTerminalia catappa(Almond) leaf extract as the reducing and stabilizing agent. On treating chloroauric acid solutions withTerminalia catappa(TC) leaf extract rapid reduction of chloroaurate ions is observed leading to the formation of highly stable gold nanoparticles in solution. TEM analysis of the gold nanoparticles indicated that they ranged in size from 10 to 35 nm with average size of 21.9 nm.

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.   

scholarly journals Synthesis of Silver Nanoparticles from Anagalis arvensis and Their Biomedical Applications

2018 ◽  
Author(s):  
Mohib Shah ◽  
Natasha Anwar ◽  
Samreen Saleem ◽  
Iqbal Munir ◽  
Niaz Ali Shah ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Power ◽  
Spherical Shape ◽  
Artemia Salina ◽  
Maximum Activity ◽  
Tem Analysis ◽  
Synthesis Of Nanoparticles ◽  
The Stability ◽  
Average Size ◽  
Biological Methods

Background. Nanotechnology is promising field for generating new applications. A green synthesis of nanoparticles through biological methods using plant extract have a reliable and ecofriendly approach to improve our global environment. Methods. Silver nanoparticles (AgNPs) were synthesized using aqueous extract of Anagalis arvensis L and silver nitrate and were physicochemically characterized. Results. The stability of AgNPs toward acidity, alkalinity, salinity and temperature showed that they remained stable at room temperature for more than two months. The SEM and TEM analysis of the AgNPs showed that they have a uniform spherical shape with an average size in the range of 40–78 nm. Further 1-Dibhenyl-2-Picrylhydrazl radical in Anagalis arvensis L.mediated AgNPs showed a maximum activity of 98% at concentration of 200μg/mL. Hydrogen peroxide scavenging assay in Anagalis arvensis L. mediated AgNPs showed a maximum activity of 85% at concentration of 200μg/mL. Reducing power of Anagalis arvensis L.Ag NPs exhibited a higher activity of 330 μg/mL at concentration of 200 μg/mL. These NPs have cytotoxic effects against brine shrimp (Artemia salina) nauplii with a value of 53% LD 178.04μg/mL. Conclusion. The AgNPs synthesized using Anagalis arvensis L. extract demonstrate a broad range of applications.

Biosynthesis of Stable Polyshaped Gold Nanoparticles from Microwave-Exposed Aqueous Extracellular Anti-malignant Guava (Psidium guajava) Leaf Extract

2009 ◽  
Vol 5 (1-4) ◽  
pp. 34-41 ◽  
Author(s):  
D. Raghunandan ◽  
S. Basavaraja ◽  
B. Mahesh ◽  
S. Balaji ◽  
S. Y. Manjunath ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Leaf Extract ◽  
Psidium Guajava

Di-Sulfide Linked Polyethylenimine Coated Gold Nanoparticles as a Non-Viral Gene Delivery Agent in NIH-3T3 Mouse Embryonic Fibroblast

2015 ◽  
Vol 15 (10) ◽  
pp. 7895-7899 ◽  
Author(s):  
Saji Uthaman ◽  
Myeong Ju Moon ◽  
Duhwan Lee ◽  
Won Jong Kim ◽  
In-Kyu Park
Keyword(s):  
Gold Nanoparticles ◽  
Gene Delivery ◽  
Fluorescent Microscopy ◽  
Weight Ratio ◽  
Mouse Embryonic Fibroblast ◽  
Luciferase Assay ◽  
Viral Gene ◽  
Hydrodynamic Diameter ◽  
Tem Analysis ◽  
Average Size

Di-sulfide linked polyethylenimine coated gold nanoparticles (ssPEI-GNPs) of 20 nm size was prepared in order to deliver the genes to target site. DLS and TEM analysis demonstrated that the GNPs have average size of 13 nm in diameter. Upon coating the GNPs with ssPEI in the weight ratio of 1:3, the average hydrodynamic diameter of the ssPEI-GNPs was found to 19 ± 1.14 nm and a zeta potential value 41 ± 1.23 mV was observed. TEM analysis of ssPEI-GNPs demonstrated that the nanoparticles have spherical morphology. Thermogravemetric analysis of the prepared ssPEI-GNPs showed that the estimated composition of the ssPEI coated over the GNPs was approximately 5% (w/w). Gene expression capabilities of the nanoparticles were confirmed by fluorescent microscopy and luciferase assay, which demonstrated the transgene delivery capability of the ssPEI-GNPs. These results demonstrate that ssPEI-GNPs could be used as gene delivery agent.

scholarly journals Optimization of multiple parameters for adsorption of arsenic (III) from aqueous solution using Psidium guajava leaf powder

2021 ◽  
Author(s):  
Uma Sankar Behera ◽  
Prakash Chandra Mishra ◽  
G. B. Radhika
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Metal Ion ◽  
Psidium Guajava ◽  
Ion Concentration ◽  
Adsorption Parameters ◽  
Batch Mode ◽  
Equilibrium Study ◽  
Multiple Parameters ◽  
Desorption Study

Abstract The conventional method of water treatment using activated carbon from several sources has been focused extensively since the last two decades. However, rare attention has been noticed on natural adsorbents such as plant leaves. Therefore, the Psidium guajava (Guava) leaf has been investigated to understand it's adsorption efficacy for Arsenic (III) [As(III)] in this study. The effect of process variables, e.g., pH, concentration of metal ion, adsorbent's particle size, and dosages, are evaluated. Experiments are carried out in batch mode, and the individual and combined parameter's impact on adsorption have been discussed. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) is used to characterize the adsorbent's surface. Freundlich and Langmuir's isotherms are used for adsorption equilibrium study. The adsorption parameters are optimized by establishing a regression correlation using central composite design (CCD) of response surface methodology (RSM). The analysis of variance (ANOVA) suggests a high regression coefficient (R2 = 0.9249) for the removal of As(III). Particle size of 0.39 mm; adsorbent's height of 10 cm; metal ion concentration of 30 ppm, and pH 6 are optimized to remove 90.88% As(III) from aqueous solution. HCl is evaluated as a potential solvent for desorption of arsenic from desorption study.

scholarly journals PSIDIUM GUAJAVA: A NOVEL PLANT IN THE SYNTHESIS OF SILVER NANOPARTICLES FOR BIOMEDICAL APPLICATIONS.

2018 ◽  
Vol 11 (1) ◽  
pp. 341
Author(s):  
Sharmila C ◽  
Ranjith Kumar R ◽  
Chandar Shekar B
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Biomedical Applications ◽  
Leaf Extract ◽  
Cost Effective ◽  
Psidium Guajava ◽  
Tem Analysis ◽  
X Ray ◽  
Green Route

 Objective: Synthesis of silver nanoparticles (AgNPs) using a simple, cost-effective and environmentally friendly green route approach and to study the antibacterial activity of AgNPs against human pathogens.Methods: Green route approach is used to synthesize AgNPs using Psidium guajava leaf extract. Fourier transform infrared (FTIR) was used to identify the presence of the functional group. X-ray diffraction (XRD) was used to analyze the structure of prepared AgNPs. Energy dispersive X-ray was used to the characteristic to the composition of the prepared nanoparticles. Size and morphology of the prepared AgNPs were investigated using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analysis. Antibacterials efficiency of prepared AgNPs was tested against Escherichia coli and Staphylococcus aureus by well diffusion methods.Results: FTIR study shows the presence of different functional groups present in the leaves mediated AgNPs. The XRD studies yield diffraction peaks corresponding to face-centered cubic structure of Ag crystals. Spherical shaped AgNPs with a particle size of about ~55 nm were evidenced using FESEM and TEM analysis. Energy dispersive spectrum of the synthesized AgNPs confirms the presence of silver in the prepared nanoparticles. From UV-VIS analysis it is shown that the absorption band was red-shifted from 430 nm to 456 nm. The prepared AgNPs shows good antibacterial activity against E. coli and S. aureus.Conclusions: P. guajava leaf extract is a potential reducing agent to synthesize AgNPs. The green synthesis approach provides cost-effective and eco-friendly nanoparticles, which could be used in biomedical applications.

scholarly journals Phytofabrication of Silver Nanoparticles (AgNPs) with Pharmaceutical Capabilities Using Otostegia persica (Burm.) Boiss. Leaf Extract

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1045
Author(s):  
Majid Sharifi-Rad ◽  
Pawel Pohl ◽  
Francesco Epifano
Keyword(s):  
Silver Nanoparticles ◽  
Zeta Potential ◽  
Leaf Extract ◽  
Salmonella Typhi ◽  
Localized Surface Plasmon ◽  
Total Phenolic ◽  
Synthesis Of Nanoparticles ◽  
Otostegia Persica ◽  
Anti Inflammatory ◽  
Average Size

In the last years, the plant-mediated synthesis of nanoparticles has been extensively researched as an affordable and eco-friendly method. The current study confirms for the first time the capability of the Otostegia persica (Burm.) Boiss. leaf extract for the synthesis of silver nanoparticles (AgNPs). The phytofabricated AgNPs were characterized by ultraviolet–visible spectroscopy (UV-Vis), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and zeta potential analysis. Moreover, the total phenolic and flavonoids contents, and the antioxidant, antibacterial, antifungal, and anti-inflammatory properties of the phytofabricated AgNPs and the O. persica leaf extract were assessed. The results showed that the produced AgNPs were crystalline in nature and spherical in shape with an average size of 36.5 ± 2.0 nm, and indicated a localized surface plasmon resonance (LSPR) peak at around 420 nm. The zeta potential value of −25.2 mV pointed that the AgNPs were stable. The phytofabricated AgNPs had lower total phenolic and flavonoids contents than those for the O. persica leaf extract. The abovementioned AgNPs showed a higher antioxidant activity as compared with the O. persica leaf extract. They also exhibited significant antibacterial activity against both Gram-positive (Staphylococcus aureus, Bacillus subtilis, and Streptococcus pyogenes) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa, and Salmonella typhi) bacteria. In addition, appropriate antifungal effects with the minimum inhibitory concentration (MIC) values of 18.75, 37.5, and 75 µg mL−1 against Candida krusei, Candida glabrata, and Candida albicans, respectively, were noted for this new bionanomaterial. Finally, the phytofabricated AgNPs showed dose-dependent anti-inflammatory activity in the human red blood cell (RBC) membrane stabilization test, being higher than that for the O. persica leaf extract. The resulting phytofabricated AgNPs could be used as a promising antioxidant, antibacterial, antifungal, and anti-inflammatory agent in the treatments of many medical complications.

scholarly journals EFFECT OF CONCENTRATION OF IMPERATA CYLINDRICA L LEAF EXTRACT ON SYNTHESIS PROCESS OF GOLD NANOPARTICLES

2018 ◽  
Vol 19 (2) ◽  
pp. 72
Author(s):  
Iwan Syahjoko Saputra ◽  
Yoki Yulizar ◽  
Sudirman Sudirman
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Leaf Extract ◽  
Synthesis Method ◽  
Ion Source ◽  
Imperata Cylindrica ◽  
Hydroxyl Group ◽  
Synthesis Process ◽  
Tem Analysis ◽  
Ft Ir

Gold Nanoparticles (GoldNPs) successful was performed using HAuCl4 precursor as Au3+ ion source with 7x10-4 M concentration. The research aims to knows effect of concentration variation of Imperata cylindrica L leaf extract on synthesis process of gold nanoparticles. The research used of green synthesis method. Colloid of nanoparticles which is formed in analyzed using UV-Vis Spectrophotometer, FT-IR Spectroscopy, PSA, PZC, XRD and TEM. The results of synthesis showed the best concentration of Imperata cilindrica L leaf extract at 3,46%, happen a shift of wavelength at UV-Vis from 216 nm to 530 nm with 1.779 absorbance value. The PSA analysis showed a particle size of 51.87 nm and a PZC value of -19.2 mV. The result of FT-IR indicated a shift of wavenumber in the hidroxyl group from 3354 cm-1 to 3390 cm-1 and showed a interaction of hydroxyl group at imperata cylindrica L leaf extract with Au3+ ion. TEM analysis shows the morphology of GoldNPs that spherical shape with a particle size of 20 nm. XRD calculation results show crystallite size of gold nanoparticles is 15.47 nm.

scholarly journals Green Synthesis and Characterization of α-Fe2O3 Nanoparticles using Leaf Extract of Syzygium cumini and their Suitability for Adsorption of Cu(II) and Pb(II) Ions

2019 ◽  
Vol 31 (8) ◽  
pp. 1809-1814 ◽  
Author(s):  
Naveen Chandra Joshi ◽  
Akshita Chodhary ◽  
Yashwini Prakash ◽  
Ajay Singh
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Large Scale ◽  
Leaf Extract ◽  
Low Cost ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Syzygium Cumini ◽  
Fe2o3 Nanoparticles ◽  
Synthetic Process

In the present study, we have synthesized α-Fe2O3 nanoparticles by using the leaf extract of Syzygium cumini. The applying green synthetic process is very efficient, low cost and can be applicable in the large scale operations. The freshly synthesized dried nanoparticles were characterized by UV-visible, FT-IR, XRD and FESEM. The α-Fe2O3 (haematite) nanoparticles have now used as effective nano-adsorbents for the removal of Cu(II) and Pb(II) ions from synthetically prepared wastewater under batch conditions. The batch system included contact time, dosage, pH, concentration and temperature. The maximum adsorption efficiency was found at optimized conditions such as contact time 60 min, higher acidic pH 6, higher dosage of sorbent 1.0 g and lower metal ion concentration 10 mg/L. For Pb(II) ions, 59.79, 85.10, 51.39 and 36.81 % adsorption was found at contact time 60 minutes, pH 6, dosage 1 g and metal ion concentration 10 mg/L. Similarly, for Cu(II) ions at same conditions, the adsorption was found to be 49.88, 69.73, 53.77 and 20.68 %, respectively. The equilibrium data of adsorption have been tested by Langmuir, Freundlich and Temkin isotherm models. The adsorption data were best fitted to Langmuir isotherm model with the regression values R2 = 0.984 for Cu(II) ions and R2 = 0.9383 for Pb(II) ions. The adsorption capacity of α-Fe2O3 nanoparticles for Cu(II) and Pb(II) ions was found 7.535 and 6.480 mg/g, respectively.

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