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

Deshpande, Raghunandan; Basavaraja, S.; Mahesh, B.; Balaji, S.; Manjunath, S. Y.; Venkataraman, A.

doi:10.1007/s12030-009-9030-8

Cited by 129 publications

(62 citation statements)

References 29 publications

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“…It is well known that the shape of metallic nanoparticles considerably changed their optical and electronic properties as reported earlier by [35,36] Shipway et al, (2000); Nie and Emory (1997). When compared to the previous reports of [37,38] Noruzi et al, and Raghunandan et al, states that the algal-mediated silver nanoparticle shape varies as spherical triangle, and pseudospherical [35][36][37][38]. The coating material is believed to be a bioorganic component of S. fusiformis.…”

Section: Discussionmentioning

confidence: 76%

Green Synthesis, Characterization of Silver Nanoparticles of a Marine Red Alga Spyridia Fusiformis and Their Antibacterial Activity

Murugesan¹,

Bhuvaneswari²,

Sivamurugan³

2017

Int J Pharm Pharm Sci

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Objective: In the present system, the green synthesis of silver nanoparticles using marine the red alga Spyridia fusiformis and antibacterial activity was carried out. Methods:The seaweed extract was used for the synthesis of AgNPs Results:The UV-visible spectroscopy revealed surface plasmon resonance at 450 nm. The FT-IR measurements showed the possible functional groups responsible for the formation of nanoparticles. The X-ray diffraction analysis showed that the particles were crystalline in nature. TEM micrograph has shown the formation of silver nanoparticles with the size in the range of 5-50 nm. The silver nanoparticles synthesized from the S. fusiformis showed higher activity and proved their efficacy in controlling the pathogenic bacterial strains. The nanoparticles showed highest inhibition activity on K. pneumaniae and S. aureus up to 26 and 24±0.01 mm at 100 μg/ml of nanoparticles.at room temperature. The silver nanoparticles were characterized by using UVVisible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscope and X-ray diffraction (XRD) techniques. The antibacterial activity of biosynthesized silver nanoparticles was carried out by disc diffusion method against pathogenic bacteria. Conclusion:The synthesised AgNPs have shown the best antibacterial activity against human pathogens Keywords: Antibacterial activity, Green synthesis, Marine algae, Silver nanoparticles, Spyridia fusiformis E. coli, K. pneumoniae, S. aureus and P. aeruginosa. The above eco-friendly AgNPs synthesis procedure could be a viable solution for industrial applications in the future and therapeutic needs.

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Section: Discussionmentioning

confidence: 76%

Green Synthesis, Characterization of Silver Nanoparticles of a Marine Red Alga Spyridia Fusiformis and Their Antibacterial Activity

Murugesan¹,

Bhuvaneswari²,

Sivamurugan³

2017

Int J Pharm Pharm Sci

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“…In addition to presenting a surface image, AFM can also provide quantitative measurements of feature sizes, such as step heights and other dimensions [32,33].…”

Section: Experimental Methods Applied For Characterization Of Metal Nmentioning

confidence: 99%

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Masarovičová¹,

Kráľová²

2013

Ecological Chemistry and Engineering S

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Metal nanoparticles (MNPs) belong mostly to the engineered type of nanoparticles and have not only unique physical and chemical properties but also different biological actions. In recent years, noble MNPs and their nano-sized agglomerates (collectively referred to as nanoparticles or particles in the subsequent sections) have been the subjects of much focused research due to their unique electronic, optical, mechanical, magnetic and chemical properties that can be significantly different from those of bulk materials. To enhance their use, it is important to understand the generation, transport, deposition, and interaction of such particles. Synthesis of MNPs is based on chemical or physical synthetic procedures and by use of biological material ("green synthesis" as an environmentally benign process) including bacteria, algae and vascular plants (mainly metallophytes). In biological methods for preparation of metal nanoparticles mainly leaf reductants occurring in leaf extracts are used. MNPs can be formed also directly in living plants by reduction of the metal ions absorbed as a soluble salt, indicating that plants are a suitable vehicle for production of MNPs. These methods used for preparation of MNPs are aimed to control their size and shape. Moreover, physicochemical properties of MNPs determine their interaction with living organisms. In general, inside the cells nanoparticles might directly provoke either alterations of membranes and other cell structures or activity of protective mechanisms. Indirect effects of MNPs depend on their physical and chemical properties and may include physical restraints, solubilization of toxic nanoparticle compounds or production of reactive oxygen species. Toxic impacts of MNPs on plants is connected with chemical toxicity based on their chemical composition (eg release of toxic metal ions) and with stress or stimuli caused by the surface, size and shape of these nanoparticles. Positive effects of MNPs were observed on the following plant features: seed germination, growth of plant seedlings, stimulation of oxygen evolution rate in chloroplasts, protection of chloroplasts from aging for long-time illumination, increase of the electron transfer and photophosphorylation, biomass accumulation, activity of Rubisco, increase of quantum yield of photosystem II, root elongation, increase of chlorophyll as well as nucleic acid level and increase in the shoot/root ratio. However, it should be stressed that MNPs impact on human and environmental health remains still unclear.

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“…Previous researcher reported that the P. guajava leaf extract showed terpenoids compounds in high concentration (>50%) when compared with other plant phytochemicals such as flavonoids, tannins, etc. [15,20]. Guajadial (1) is a novel caryophyllene based meroterpenoid, was isolated from the leaves of P. guajava [21], which may be responsible for the reduction of AgNPs.…”

Section: Resultsmentioning

confidence: 99%

“…Among these medicinal plants, Psidium guajava (Guava) plant has showed high medicinal value. Studies have shown that AgNPs prepared from guava leaves were used in different application [15]. In most ethnopharmacological studies of P. guajava leaves showed that the leaf extract has antidiarrheal, antibacterial, anti-inflammatory, and anticancer activities [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Psidium Guajava: A Novel Plant in the Synthesis of Silver Nanoparticles for Biomedical Applications.

Sharmila¹,

Ranjith²,

B³

2018

Asian J Pharm Clin Res

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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 ecofriendly nanoparticles, which could be used in biomedical applications.

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

Cited by 129 publications

References 29 publications

Green Synthesis, Characterization of Silver Nanoparticles of a Marine Red Alga Spyridia Fusiformis and Their Antibacterial Activity

Green Synthesis, Characterization of Silver Nanoparticles of a Marine Red Alga Spyridia Fusiformis and Their Antibacterial Activity

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Psidium Guajava: A Novel Plant in the Synthesis of Silver Nanoparticles for Biomedical Applications.

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