Bio-functionalized anisotropic gold nanoparticles as efficient catalyst for nitrile hydration and hydrogenation of nitrophenol

Hazarika, Mukut; Kalita, Gauravjyoti D.; Pramanik, Sujata; Borah, Debajit; Das, Pankaj

doi:10.1016/j.crgsc.2020.100018

Cited by 10 publications

(5 citation statements)

References 32 publications

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“… 45 In plant extract-mediated synthesis, different phytochemicals in the extracts are capable of reducing the Au 3+ and give rise to anisotropic AuNPs. 59 − 61 No signs of aggregation was observed in this study, and this could be attributed to the presence of phytochemicals in the extract, which also acted as stabilizing agents during the biosynthesis. 62 This is further supported by the presence of a “halo” around the NPs.…”

Section: Resultsmentioning

confidence: 55%

Anticancer, Antioxidant, and Catalytic Activities of Green Synthesized Gold Nanoparticles Using Avocado Seed Aqueous Extract

et al. 2023

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Disposal of agricultural waste has a negative impact on the environment and human health and may contribute to the greenhouse effect. The field of nanotechnology could provide alternative solutions to upcycle agricultural wastes in a safer manner into high-end value products. Organic waste from plants contain biomaterials that could serve as reducing and capping agents in the synthesis of nanomaterials with enhanced activities for use in biomedical and environmental applications. Persea americana (avocado) is a fruit with a high nutritional value; however, despite its rich phytochemical profile, its seed is often discarded as waste. Therefore, this study aimed to upcycle avocado seeds through the synthesis of gold nanoparticles (AuNPs) and evaluate their anticancer, antioxidant, and catalytic activities. The biosynthesis of avocado seed extract (AvoSE)-mediated AuNPs (AvoSE−AuNPs) was achieved following the optimization of various reaction parameters, including pH, temperature, extract, and gold salt concentrations. The AvoSE−AuNPs were poly-dispersed and anisotropic, with average core and hydrodynamic sizes of 14 ± 3.7 and 101.39 ± 1.4 nm, respectively. The AvoSE−AuNPs showed excellent antioxidant potential in terms of ferric reducing antioxidant power (343.88 ± 0.001 μmolAAE/L), 2,2-diphenyl-1-picrylhydrazyl (128.80 ± 0.0159 μmolTE/L), and oxygen radical absorbance capacity (1822.02 ± 12.6338 μmolTE/L); significantly reduced the viability of Caco-2 and PC-3 cells in a dose-dependent manner; and efficiently reduced 4-nitrophenol (4-NP) to 4-aminophenol. This study demonstrated how avocado seeds, an agricultural waste, can be used as sources of new bioactive materials for the synthesis of AuNPs, which have excellent antioxidant, anticancer, and catalytic activities, showing AvoSE−AuNPs' versatility in various applications. In addition, the AvoSE−AuNPs exhibited good stability and recyclability during the catalytic activity, which is significant because some of the primary issues with the use of metallic NPs as catalysts are around the cost-effectiveness, recovery, and reusability of the catalyst.

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Section: Resultsmentioning

confidence: 55%

Anticancer, Antioxidant, and Catalytic Activities of Green Synthesized Gold Nanoparticles Using Avocado Seed Aqueous Extract

et al. 2023

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“…This table clearly showed that our catalytic system is more efficient with respect to various factors such as time, solvent, temperature, and catalyst amount, and so forth when compared with other reported systems. 77-94% [30] 2 Cs (OH) in DMSO (5-10 mol%) H 2 O, under air, 100 C 6 0 -96% [67] 3 Ru@imine-nanoSiO 2 (5 mg) KOH (2 mmol), 40 C, 5 h 60-96% [30] 4 Au NPs KOH, i-PrOH: H 2 O, 80 C 3 5 -99% [35] 5…”

Section: Comparison With Other Reported Systemsmentioning

confidence: 99%

“…[32] The selective hydration of nitriles to amides under mild reaction conditions is difficult. [33] A large number of precious metals such as Au, [34,35] Pt, [36] Ru, [29][30][31]37] Rh, [38,39] Pd, [40,41] and so forth have been used for the hydration of nitriles, however due to their limited accessibility and moisture sensitivity still demand to search for a more effective protocol using low-cost metals, namely, Co, Fe, Cu, Ni, and so forth. Despite all the attempts, most of the methods reported to date have some limitations such as long reaction time, high quantity of reagents, high temperatures (180 C, 160 C, 140 C, and 120 C-100 C), [42] use of expensive catalysts, [43,44] and inert atmosphere (Ar, N 2 ).…”

Section: Introductionmentioning

confidence: 99%

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Hazarika

Borah

2022

Applied Organom Chemis

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The silica‐supported cobalt ferrite spinel nanocatalyst has been successfully synthesized by the coprecipitation method and extensively characterized by FTIR, XRD, SEM‐EDX, TEM, BET, VSM, XPS, TGA, and ICP‐AES analysis. The bands observed at 3435 cm−1 (ν OH of Si‐OH) and 1637 cm−1 (γ OH of Si‐OH) in the FTIR spectrum of the as‐synthesized nanocatalyst unambiguously tell the presence of silica support. Moreover, a very weak intensity and a medium intensity peak at 683 cm−1 and 463 cm−1 suggested intrinsic stretching vibrations of Fe‐O and Co‐O of cobalt ferrite, respectively. The XRD pattern confirms the formation of CoFe2O4 spinel. The average crystallite size was found to be 5.4 nm as calculated by using the Debye–Scherrer equation based on the (220) plane while the average particle size was found to be 5.08 nm from TEM analysis. The crystalline nature of the nanocomposite was confirmed by the SAED pattern. The successful incorporation of CoFe2O4 on the surface of silica was established by the BET surface area measurements. The silica‐supported cobalt ferrite nanocatalyst has been explored as a heterogeneous multifunctional catalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids as well under mild reaction conditions with moderate to excellent isolated yield of the desired products (60–99%). The catalyst was magnetically recoverable within a time frame of ~90 s and reusable up to the fifth catalytic cycle without profound loss of activity. A magnetic hysteresis study was performed to elucidate the magnetic behavior of the catalyst. The saturation magnetization value of 39.785 emu/g with a coercivity value of 110.87 Oe and saturation remanence value of 5.185 emu/g clearly indicated the presence of a ferromagnetic component in the material.

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“…[23,24] Many parts of G. cowa have been found to have reducing activity which is further utilized to synthesize the Au NPs of controlled morphology. [25][26][27] Biosynthesized Au NPs, overcomes challenges in lowering toxicity, yet have limited applications in catalytic coupling reactions. [28] In addition to use of green chemical protocol, realization of several modifications in a single step with the use of environmentally benign reaction conditions, or non-traditional methods, microwave irradiation (MWI) was explored.…”

Section: Introductionmentioning

confidence: 99%

“…The surface functional groups of biosynthesized nanomaterials are significant factors influencing the catalytic behaviour causing incorporation of the capping agents to synthesized NPs [23,24] . Many parts of G. cowa have been found to have reducing activity which is further utilized to synthesize the Au NPs of controlled morphology [25–27] . Biosynthesized Au NPs, overcomes challenges in lowering toxicity, yet have limited applications in catalytic coupling reactions [28] .…”

Section: Introductionmentioning

confidence: 99%

Au Nanostructures with Controlled Morphology, Biosynthesized from Garcinia cowa Fruit Extract, and Their Use in Microwave‐Mediated Bisindole Synthesis

Gohain

Thakur

2021

ChemistrySelect

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Au nanoparticles (NPs) of controlled morphology have been synthesised through an eco-friendly biogenic method utilizing the aqueous fruit extract of Garcinia cowa at room temperature. The bio extract executes dual role of reducing agent and stabilizing agent to add excellent stability to the synthesized colloidal Au NPs. The variation of particle size and morphology of Au nanostructures with respect to the quantitative part of the bio-extract were studied. After microscopic and spectroscopic characterization, further application of the Au NPs synthesized via green method in the preparation of complex organic molecules was studied. The Au NPs were employed as homogeneous catalyst in coupling of substituted indole and aromatic aldehydes to yield bisindolylmethanes, which are known precursors of anti-cancer bioactive molecules. In addition, microwave irradiation makes the coupling reaction more sustainable with very short reaction time of 40 secs.

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Bio-functionalized anisotropic gold nanoparticles as efficient catalyst for nitrile hydration and hydrogenation of nitrophenol

Cited by 10 publications

References 32 publications

Anticancer, Antioxidant, and Catalytic Activities of Green Synthesized Gold Nanoparticles Using Avocado Seed Aqueous Extract

Anticancer, Antioxidant, and Catalytic Activities of Green Synthesized Gold Nanoparticles Using Avocado Seed Aqueous Extract

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Au Nanostructures with Controlled Morphology, Biosynthesized from Garcinia cowa Fruit Extract, and Their Use in Microwave‐Mediated Bisindole Synthesis

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