Barleria prionitis Leaf Mediated Synthesis of Silver and Gold Nanocatalysts

Ghosh, Sougata; Chacko, Maliyackal Jini; Harke, Ashwini N.; Gurav, Sonal P.; Joshi, Komal; Dhepe, Aarti; Kulkarni, Anuja S.; Shinde, Vaishali; Parihar, Vijay Singh; Asok, Adersh; Banerjee, Kaushik; Kamble, Narayan; Bellare, Jayesh; Chopade, Balu A.

doi:10.4172/2157-7439.1000394

Cited by 41 publications

(23 citation statements)

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“…POLE exhibited excellent potential to reduce Au 3+ and Ag + ions to Au and Ag within 5 h which was found to be effective compared to earlier reports with Sesuvium portulacastrum L that take 24 hours for complete synthesis of AgNPs [32]. Development of intense brown and red colour confirmed the synthesis of AgNPs and AuNPs which was in agreement with the earlier reports with Litchi chinensis, Gloriosa superba and Dioscorea oppositifolia [9,17,18]. Optimization studies revealed that higher temperature facilitated the rate of synthesis while concentration of salt could enhance upto a certain limit beyond which the increase in salt concentration fails to show any visible increase in rate of synthesis [33].…”

Section: Discussionsupporting

confidence: 89%

“…Supernatant was collected and filtered through Whatman No.1 filter paper after centrifugation for 10 min at 3000 rpm. The filtrate was used for nanoparticles synthesis [17].…”

Section: Hrtem Eds Dls Analysismentioning

confidence: 99%

“…Biochemical assays were used to evaluate total phenolic content, starch, reducing sugar, ascorbic acid and citric acid in POLE according to our earlier report [10]. Further, GCMS fingerprinting was employed to estimate the predominant phytochemicals in POLE [10,[16][17][18][19].…”

Section: Phytochemical Analysismentioning

confidence: 99%

“…Addition of 50 µL of AuNPs (10 mM) and 20 µL of AgNPs (10 mM) separately started the reactions, followed to which immediately time dependent absorption spectra were recorded at an interval of 5 min intervals for 30 min at room temperature using UV-vis spectrophotometer. Deionized water was used as reference for background subtraction [14,16,17].…”

Section: Catalytic Activitymentioning

confidence: 99%

“…Hereby, herbal extracts rich in diverse groups of phytochemicals is preferred for simultaneous synthesis and capping of metal nanoparticles [8,9]. Medicinal plants like Dioscorea bulbifera, Dioscorea opposiifolia, Barleria prionitis, Gloriosa superba, Gnidia glauca, Plumbago zeylanica, have exhibited their nanobiotechnological potential towards synthesis of gold, silver, copper, platinum and palladium nanoparticles with biological activities [10][11][12][13][14][15][16][17][18][19]. Earlier reports showed that the phytogenic nanoparticles were more biocompatible and bioactive as compared to the chemically synthesized nanoparticles [13,19].…”

Section: Introductionmentioning

confidence: 99%

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Platanus orientalis Leaf Mediated Rapid Synthesis of Catalytic Gold and Silver Nanoparticles

Shende¹,

Joshi²,

Kulkarni³

et al. 2018

J Nanomed Nanotechnol

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This report details on synthesis of AuNPs and AgNPs using POLE with optimized reaction parameters, for the first time. The bioreduced nanoparticles were characterized using UV-visible spectroscopy, high resolution transmission electron microscopy (HRTEM), energy dispersive spectroscopy (EDS), dynamic light scattering (DLS), X-ray diffraction spectroscopy (XRD), fourier transform infrared (FTIR) spectrometry. Both AuNPs and AgNPs Further we evaluated the catalytic potential of the nanoparticles towards reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using NaBH 4 . AbstractIn an attempt to synthesize novel catalytic gold (AuNPs) and silver nanoparticles (AgNPs) we have used Platanus orientalis leaf extract for both reduction and capping. The synthesis was rapid which completed by 5 h as indicated by change in colour and development of prominent peak at 540 nm for AuNPs and 440 nm for AgNPs, as revealed by UV-visible spectroscopy. The phytogenic nanoparticles showed exotic shapes which included triangles, spheres, hexagons and pentagons as analyzed by high resolution transmission electron microscopy. The optimized processing parameters like salt concentration (1 mM concentration of HAuCl 4 and 4 mM of AgNO 3 ) and the reaction temperature (50°C) led to faster nanoparticles synthesis. Energy dispersive spectra and X-ray diffraction studies confirmed the elemental gold and silver in AuNPs and AgNPs. Detailed phytochemical characterization using biochemical techniques and gas chromatography mass spectrometry indicated the predominance of ascorbic acid, citric acid, reducing sugars and even starch which may together lead to simultaneous synthesis and capping. Further, AuNPs and AgNPs catalyzed the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using NaBH 4 with apparent rate constants of 1.908 × 10 -4 min -1 and 3.071 × 10 -4 min -1 , respectively. Figure 1: UV-vis spectra recorded as a function of reaction time for nanoparticle synthesis using POLE at 40°C with (A) HAuCl 4 solution and (B) 1mM AgNO 3 solution.Figure 2: Time course of nanoparticle synthesis using POLE at different reaction temperatures with (A) 1 mM HAuCl 4 and (B) 1 mM AgNO 3 .Figure 10: UV-vis absorption spectra during the reduction of 4-nitrophenol as a function of chemocatalytic activity of (A) AuNPs and (B) AgNPs synthesized by POLE. Inset figures represent plot of ln (A t /A 0 ) versus time for the reduction of 4-NP.

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Section: Discussionsupporting

confidence: 89%

“…Supernatant was collected and filtered through Whatman No.1 filter paper after centrifugation for 10 min at 3000 rpm. The filtrate was used for nanoparticles synthesis [17].…”

Section: Hrtem Eds Dls Analysismentioning

confidence: 99%