Cashew Apple Juice (Anacardium occidentaleL.) Speeds Up the Synthesis of Silver Nanoparticles

Mukunthan, K. S.; Balaji, S.

doi:10.1080/19430892.2012.676900

Cited by 157 publications

(70 citation statements)

References 32 publications

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“…terpineol, fenchol, perillyl alcohol, caryophyllene and ibozol (Campbell et al, 1997;Zelnik et al, 1978). Mukunthan and Balaji (2012) reported that nanoparticle characteristics can be influenced by extracts arising from different sources as they comprise different concentrations and combinations of organic reducing agents. However, in the present investigation, all methanol and aqueous-derived nanoparticles displayed similar FTIR spectra.…”

Section: Edx Analysismentioning

confidence: 99%

Green synthesis of nano-silver particles from leaf and stem extracts of Iboza (Tetradenia riparia)

Shaik¹,

Mkize²,

Khumalo³

et al. 2015

Afr. J. Trad. Compl. Alt. Med.

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Background: Secondary metabolites derived from plant extracts can be used in the reduction of metal salts into their respective nanoparticles using simple, environmentally friendly and cost effective green synthesis techniques. Metal nanoparticles have important applications in medicine and agriculture. The leaves of Tetradenia riparia (Iboza), an important medicinal species in South Africa, are reported to contain various terpenoids and pyrones which can be used in the reduction of silver nitrate (AgNO 3 ) to nano-silver particles. Materials and Methods: Fresh leaves and stems of Iboza were oven-dried, crushed, extracted in water and methanol and filtered followed by incubation with AgNO 3 . Synthesized nano-silver particles were characterised using ultraviolet visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. Results:The bio-reduction of metal ion to base metal was rapidly conducted in a single step and at room temperature and pressure. UV-Vis spectra showed the characteristic surface plasmon resonance band of the synthesized nano-silver particles at 410 nm for all extracts. SEM analysis revealed predominantly aggregated spherically-shaped nano-silver particles with a size range of 20-50 nm and an average diameter of 26 nm. The presence of elemental silver in the nanoparticles was confirmed by EDX at 3 keV. As revealed by FTIR analysis, the reducing agents included terpenoids and pyrones which were responsible for reducing and capping the nano-silver particles. Conclusion: Both methanol and aqueous-derived extracts of Iboza leaves and stems can be used to synthesize nano-silver particles. FTIR evidence suggests that the reduction of the silver ions and the synthesis of the nanoparticles may have been actioned by various terpenoid and pyrone compounds found in the plant parts.

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Section: Edx Analysismentioning

confidence: 99%

Green synthesis of nano-silver particles from leaf and stem extracts of Iboza (Tetradenia riparia)

Shaik¹,

Mkize²,

Khumalo³

et al. 2015

Afr. J. Trad. Compl. Alt. Med.

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“…SEM image also showed that the large bioactive compounds were attached to the surfaces of small AgNPs, making them stable by preventing agglomeration. 6,10,11 The presence of metallic silver in the synthesized AgNPs was further confirmed by the EDX analysis. The EDX spectrum ( Figure 7B) showed strong peaks of metallic silver in the range of 3.0-4.0 keV.…”

Section: Ftir Analysismentioning

confidence: 67%

“…10,11 These naturally occurring plant secondary metabolites possess strong reduction properties, which can be linked with the higher potential ability of plant extracts to synthesize chemical-free AgNPs with minimum toxic effects. 1 Among different plant species, medicinal plants are of special concern since they control the size and shape of nanoparticles by providing capping layers to nanoparticles and also prevent them from agglomeration.…”

Section: Introductionmentioning

confidence: 99%

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Biomimetic synthesis of antimicrobial silver nanoparticles using in vitro-propagated plantlets of a medicinally important endangered species: Phlomis bracteosa

Anjum

Abbasi

2016

IJN

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In vitro-derived cultures of plants offer a great potential for rapid biosynthesis of chemical-free antimicrobial silver nanoparticles (AgNPs) by enhancing their phytochemical reducing potential. Here, we developed an efficient protocol for in vitro micropropagation of a high-value endangered medicinal plant species, Phlomis bracteosa , in order to explore its biogenic potential in biomimetic synthesis of antimicrobial AgNPs. Murashige and Skoog medium supplemented with 2.0 mg/L thidiazuron was found to be more efficient in inducing optimum in vitro shoot regeneration (78%±4.09%), and 2.0 mg/L indole-3-butyric acid was used for maximum root induction (86%±4.457%). Antimicrobial AgNPs were successfully synthesized by using aqueous extract (rich in total phenolics and flavonoids content) of in vitro derived plantlets of P. bracteosa . Ultraviolet–visible spectroscopy of synthesized AgNPs showed characteristic surface plasmon band in the range of 420–429 nm. The crystallinity, size, and shape of the AgNPs were characterized by X-ray diffraction and scanning electron microscopy. Face-centered cubic AgNPs of almost uniform spherical size (22.41 nm) were synthesized within a short time (1 hour) at room temperature. Fourier-transform infrared spectroscopy revealed that the polyphenols were mainly responsible for reduction and capping of synthesized AgNPs. Energy dispersive X-ray analysis further endorsed the presence of elemental silver in synthesized AgNPs. These biosynthesized AgNPs displayed significantly higher bactericidal activity against multiple drug-resistant human pathogens. The present work highlighted the potent role of in vitro-derived plantlets of P. bracteosa for feasible biosynthesis of antimicrobial AgNPs, which can be used as nanomedicines in many biomedical applications.

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“…The nature of plant extract affects the kind of nanoparticles synthesized in a highly critical manner, with the source of plant extract being the most vital factor affecting the morphology of synthesized nanoparticles. 9 Interestingly, this is so because different plant extracts contain different amounts of biochemical reducing agents. 10 Use of extracts from various plant parts, such as fruits, stems, bark, seeds, and latex, has been reported for the green synthesis of AgNPs.…”

Section: Introductionmentioning

confidence: 99%

Thidiazuron-enhanced biosynthesis and antimicrobial efficacy of silver nanoparticles via improving phytochemical reducing potential in callus culture of Linum usitatissimum L.

Anjum¹,

Abbasi²

2016

IJN

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Green synthesis of silver nanoparticles (AgNPs) by using plants is an emerging class of nanobiotechnology. It revolutionizes all domains of medical sciences by synthesizing chemical-free AgNPs for various biomedical applications. In this report, AgNPs were successfully synthesized by using whole plant extract (WPE) and thidiazuron-induced callus extract (CE) of Linum usitatissimum . The phytochemical analysis revealed that the total phenolic and flavonoid contents were higher in CE than that in WPE. Ultraviolet-visible spectroscopy of synthesized AgNPs showed a characteristic surface plasmon band in the range of 410–426 nm. Bioreduction of CE-mediated AgNPs was completed in a shorter time than that of WPE-mediated AgNPs. Scanning electron microscopy showed that both types of synthesized AgNPs were spherical in shape, but CE-mediated AgNPs were smaller in size (19–24 nm) and more scattered in distribution than that of WPE-mediated AgNPs (49–54 nm). X-ray diffraction analysis confirmed crystalline nature (face-centered cubic) of both types of AgNPs. Fourier-transform infrared spectroscopy revealed that the polyphenols and flavonoids were mainly responsible for reduction and capping of synthesized AgNPs. Energy dispersive X-ray analysis further confirmed the successful synthesis of AgNPs. Moreover, the synthesized AgNPs were found to be stable over months with no change in the surface plasmon bands. More importantly, CE-mediated AgNPs displayed significantly higher bactericidal activity against multiple drug-resistant human pathogens than WPE-mediated AgNPs. The present work highlighted the potent role of thidiazuron in in vitro-derived cultures for enhanced biosynthesis of chemical-free AgNPs, which can be used as nanomedicines in many biomedical applications.

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Cashew Apple Juice (Anacardium occidentaleL.) Speeds Up the Synthesis of Silver Nanoparticles

Cited by 157 publications

References 32 publications

Green synthesis of nano-silver particles from leaf and stem extracts of <i>Iboza</i> (<i>Tetradenia riparia</i>)

Green synthesis of nano-silver particles from leaf and stem extracts of <i>Iboza</i> (<i>Tetradenia riparia</i>)

Biomimetic synthesis of antimicrobial silver nanoparticles using in vitro-propagated plantlets of a medicinally important endangered species: Phlomis bracteosa

Thidiazuron-enhanced biosynthesis and antimicrobial efficacy of silver nanoparticles via improving phytochemical reducing potential in callus culture of Linum usitatissimum L.

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