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Dr. Brajesh Kumar
TATA College

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0 Photocatalysis
0 green synthesis
0 spectroscopic techniques
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green synthesis
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Short Biography

Dr. Brajesh Kumar is currently working as an Assistant Professor and Head in the Post Graduate Department of Chemistry, TATA College, Chaibasa, India. He received a Ph.D. in Chemistry from the University of Delhi, India in 2009. His research interests include the development of sustainable and eco-friendly techniques for nanoparticle synthesis and their applications for environmental remediation, active films of organic solar cells, nanomedicine, sensors, natural product extraction, purification and analysis, natural polymers, peptide chemistry, microwave and ultrasound-assisted organic synthesis, and organic synthesis. Dr. Brajesh Kumar has received different national and international fellowships and worked as a faculty member in various universities throughout India, Ecuador, and South Korea. He has also published numerous SCI/SCIE/Scopus research articles (h index = 26, Citations 2264) and is also working as board member in numerous journal and an active reviewer of more than 50 journals.

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Short communication
Published: 27 August 2021 in Inorganic Chemistry Communications
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Green methods using discarded fruit and vegetable waste are a safer alternative for the synthesis of metal nanoparticles, due to their simplicity, low cost and ecofriendly nature. In this investigation, the bioactive constituents of Nephelium Lappaceum L. (Rambutan) peel extract were effectively used as reducer to synthesize gold nanoflowers (AuNFs) and attempted to convert fruit waste into a valuable product. A quick and simple synthesis of bluish-purple color AuNfs was observed to occur with a plasmonic resonance band, λmax around 563 nm. Transmission electron microscopy and dynamic light scattering analysis confirming the formation of clusters of gold nanoparticle similar to flowers/AuNFs with a size of 70-115 nm and each monodispersed nanoparticles has an average size of 11.6 ± 2.35 nm. Fourier transform infrared spectroscopy confirmed that the AuNfs were capped with hydroxyl (-OH) and carboxyl (-COOH) groups of rambutan peel. In addition, the resulting AuNfs showed catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol (1.9089 x 10-1 min-1, R2 = 0.969), efficiently. The suggested synthetic method is facile, sustainable, cost-effective and convenient for the development of value-added products in future nanotechnology products.

ACS Style

Brajesh Kumar; Kumari Smita; Pavel Borovskikh; Alexandr Shchegolkov; Alexis Debut; Luis Cumbal. Spectroscopic and Morphological characterization of Nephelium lappaceum L. peel extract synthesized gold nanoflowers and its catalytic activity. Inorganic Chemistry Communications 2021, 108868 .

AMA Style

Brajesh Kumar, Kumari Smita, Pavel Borovskikh, Alexandr Shchegolkov, Alexis Debut, Luis Cumbal. Spectroscopic and Morphological characterization of Nephelium lappaceum L. peel extract synthesized gold nanoflowers and its catalytic activity. Inorganic Chemistry Communications. 2021; ():108868.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Pavel Borovskikh; Alexandr Shchegolkov; Alexis Debut; Luis Cumbal. 2021. "Spectroscopic and Morphological characterization of Nephelium lappaceum L. peel extract synthesized gold nanoflowers and its catalytic activity." Inorganic Chemistry Communications , no. : 108868.

Review
Published: 20 August 2021 in Materials
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Heavy metal is released from many industries into water. Before the industrial wastewater is discharged, the contamination level should be reduced to meet the recommended level as prescribed by the local laws of a country. They may be poisonous or cancerous in origin. Their presence does not only damage people, but also animals and vegetation because of their mobility, toxicity, and non-biodegradability into aquatic ecosystems. The review comprehensively discusses the progress made by various adsorbents such as natural materials, synthetic, agricultural, biopolymers, and commercial for extraction of the metal ions such as Ni2+, Cu2+, Pb2+, Cd2+, As2+ and Zn2+ along with their adsorption mechanisms. The adsorption isotherm indicates the relation between the amount adsorbed by the adsorbent and the concentration. The Freundlich isotherm explains the effective physical adsorption of the solute particle from the solution on the adsorbent and Langmuir isotherm gives an idea about the effect of various factors on the adsorption process. The adsorption kinetics data provide valuable insights into the reaction pathways, the mechanism of the sorption reaction, and solute uptake. The pseudo-first-order and pseudo-second-order models were applied to describe the sorption kinetics. The presented information can be used for the development of bio-based water treatment strategies.

ACS Style

Archana Gupta; Vishal Sharma; Kashma Sharma; Vijay Kumar; Sonal Choudhary; Priyanka Mankotia; Brajesh Kumar; Harshita Mishra; Amitava Moulick; Adam Ekielski; Pawan Kumar Mishra. A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment. Materials 2021, 14, 4702 .

AMA Style

Archana Gupta, Vishal Sharma, Kashma Sharma, Vijay Kumar, Sonal Choudhary, Priyanka Mankotia, Brajesh Kumar, Harshita Mishra, Amitava Moulick, Adam Ekielski, Pawan Kumar Mishra. A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment. Materials. 2021; 14 (16):4702.

Chicago/Turabian Style

Archana Gupta; Vishal Sharma; Kashma Sharma; Vijay Kumar; Sonal Choudhary; Priyanka Mankotia; Brajesh Kumar; Harshita Mishra; Amitava Moulick; Adam Ekielski; Pawan Kumar Mishra. 2021. "A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment." Materials 14, no. 16: 4702.

Review
Published: 16 August 2021 in Journal of Composites Science
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The green synthesis of nanoscale materials is of special interest to researchers all over the world. We describe a simple, robust, inexpensive, and environmentally friendly approach to the synthesis of gold, silver, and iron nanoparticles using a variety of biomolecules/phytochemicals as potential reducers and stabilizers. The green approach to the controlled synthesis of nanoparticles with different morphologies is based on the use of plant extracts. Green synthesized nanoparticles can be used as catalysts, photocatalysts, adsorbents, or alternative agents for the elimination of various organic dyes. The kinetic enhancement of nanoparticles for the degradation/removal of dyes could provide significant and valuable insights for the application of biochemically functionalized nanoparticles in engineering. In this review, current plant-mediated strategies for preparing nanoparticles of gold, silver, and iron are briefly described, and morphologically dependent nanoparticles for the degradation of organic pollutants in wastewater are highlighted. Overall, the approach presented in the article supports environmental protection and is a promising alternative to other synthesis techniques.

ACS Style

Brajesh Kumar. Green Synthesis of Gold, Silver, and Iron Nanoparticles for the Degradation of Organic Pollutants in Wastewater. Journal of Composites Science 2021, 5, 219 .

AMA Style

Brajesh Kumar. Green Synthesis of Gold, Silver, and Iron Nanoparticles for the Degradation of Organic Pollutants in Wastewater. Journal of Composites Science. 2021; 5 (8):219.

Chicago/Turabian Style

Brajesh Kumar. 2021. "Green Synthesis of Gold, Silver, and Iron Nanoparticles for the Degradation of Organic Pollutants in Wastewater." Journal of Composites Science 5, no. 8: 219.

Preprint content
Published: 05 May 2021
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Scope of green chemistry in nanobiotechnology is generating research interest in the development of an ecofriendly synthesis of nanoparticles and their wide range of applications in engineering and biomedical field. In the present study, we report a simple and ecofriendly phytosynthesis of silver nanoparticles (AgNPs) using Ají amarillo chilli (Capsicum baccatum L.) fruit, where phytoconstituents of C. baccatum behaves as a reducing as well as a stabilizing agent. The phyotsynthesized AgNPs were characterized through various spectroscopic and microscopic techniques. The produced AgNPs showed surface plasmon resonance (SPR) at λmax = 458 nm and stable for 10 days, confirmed by UV-vis spectroscopy. Transmission electron microscopy (TEM) explained that produced AgNPs were almost spherical in shape with average size of 10-30 nm along with small aggregation. Aggregation of AgNPs was indicated in the dynamic light scattering (DLS) analysis. The results also demonstrate that as-synthesized AgNPs are low-cost and rapid alternative as optical chemical sensors and showed >50% H2O2 quenching/ sensing activity for 15 mins at room temperature.

ACS Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. Ají Amarillo Chilli-Assisted Phytosynthesis of Silver Nanoparticles and Their H2O2 Sensing Ability. 2021, 1 .

AMA Style

Brajesh Kumar, Kumari Smita, Alexis Debut, Luis Cumbal. Ají Amarillo Chilli-Assisted Phytosynthesis of Silver Nanoparticles and Their H2O2 Sensing Ability. . 2021; ():1.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. 2021. "Ají Amarillo Chilli-Assisted Phytosynthesis of Silver Nanoparticles and Their H2O2 Sensing Ability." , no. : 1.

Journal article
Published: 24 November 2020 in Nanoscience & Nanotechnology-Asia
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Background: Natural and synthetic polymeric materials can be used in the fields of biomedicine and pharmaceuticals as a material for controlled drug delivery. Among the synthetic polymers, polyesters are synthesized from two natural monomers: lactic and glycolic acid, which are biocompatible and biodegradable. Objective: Here we review broad aspects of polyesters including its properties, synthesis, characterization, and particle drug delivery applications. Conclusion: Finally, we have concluded that polyesters are certainly very versatile material that is continuously reinvented for future application in new areas of science and medicine. However, several aspects must be considered when synthesizing polyesters, which have a direct influence on biodegradability and biocompatibility. These properties may limit the performance of in vitro and in vivo tests.

ACS Style

Katherine Pazmiño V.; Karla Sofía Vizuete; Frank Alexis; Brajesh Kumar; Alexis Debut. A Closer Look to Polyesters: Properties, Synthesis, Characterization, and Particle Drug Delivery Applications. Nanoscience & Nanotechnology-Asia 2020, 10, 1 -39.

AMA Style

Katherine Pazmiño V., Karla Sofía Vizuete, Frank Alexis, Brajesh Kumar, Alexis Debut. A Closer Look to Polyesters: Properties, Synthesis, Characterization, and Particle Drug Delivery Applications. Nanoscience & Nanotechnology-Asia. 2020; 10 ():1-39.

Chicago/Turabian Style

Katherine Pazmiño V.; Karla Sofía Vizuete; Frank Alexis; Brajesh Kumar; Alexis Debut. 2020. "A Closer Look to Polyesters: Properties, Synthesis, Characterization, and Particle Drug Delivery Applications." Nanoscience & Nanotechnology-Asia 10, no. : 1-39.

Brief communication
Published: 06 November 2020 in Journal of Cluster Science
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Copper oxide nanoparticles have gained considerable attention in the past two decades due to their simplicity and exhibit a range of potentially useful physical properties. In the present study, a simple, low cost, and environmental friendly synthesis of Cuprous oxide (Cu2O) nanoparticles using Prunus serotina Ehrh. var. Capuli cherry extract has been reported. The phytochemicals of Capuli cherry induce the reduction Cu2+ ions to Cu2O and also act as capping agent. UV–vis spectroscopy technique confirms the formation of Cu2O NPs at λmax = 446.5 nm (energy bandgap = 2.77 eV). Morphology, crystallinity and surface properties of nanoparticles were studied using Scanning transmission electron microscopy (STEM), Dynamic light scattering (DLS), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. STEM and DLS characterization indicated the formation of spherical Cu2O NPs of average size 30–55 nm. The XRD analysis confirmed that as-synthesized Cu2O were face-centered cubic (FCC) crystalline structures. The produced Cu2O nanoparticles exhibited good photocatalytic activity for degradation of Thioflavin T dye (> 60%, 90 min). In future, the present investigation could prove to synthesize nanoparticles in bulk and also for environmental remediation.

ACS Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. Green Synthesis of Cuprous Oxide Nanoparticles Using Andean Capuli (Prunus serotina Ehrh. var. Capuli) Cherry. Journal of Cluster Science 2020, 1 -8.

AMA Style

Brajesh Kumar, Kumari Smita, Alexis Debut, Luis Cumbal. Green Synthesis of Cuprous Oxide Nanoparticles Using Andean Capuli (Prunus serotina Ehrh. var. Capuli) Cherry. Journal of Cluster Science. 2020; ():1-8.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. 2020. "Green Synthesis of Cuprous Oxide Nanoparticles Using Andean Capuli (Prunus serotina Ehrh. var. Capuli) Cherry." Journal of Cluster Science , no. : 1-8.

Short communication
Published: 17 October 2020 in Waste and Biomass Valorization
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Nowadays, iron oxide based nanomaterials are well known for their multifunctional properties and their applications in various fields. In this article, a simple, one pot and green method for the biosynthesis of single phase maghemite (γ-Fe2O3) nanoparticles using an aqueous fruit extract of Ficus carica were reported. A detailed spectroscopic and microscopic analysis based on UV–Vis, XRD, FTIR, TGA, DLS, TEM and SAED were used to establish the optical property, morphology, composition, purity, nature and other properties of the synthesized γ-Fe2O3 NPs. UV–Vis, FTIR and TGA analysis indicated the involvement of phytochemicals of Ficus carica fruits in nanoparticle synthesis and direct functionalization of nanoparticle surfaces. XRD pattern confirmed the purity and nature of well-crystallized γ-Fe2O3 NPs. DLS showed the average hydrodynamic size of γ-Fe2O3 NPs while, TEM micrographs confirmed the formation of spherical and 4–6 nm sized γ-Fe2O3 NPs. In addition, the γ-Fe2O3 NPs showed (a) free radical scavenging activity against DPPH and (b) catalytic activity for the reduction of 4-Nitrophenol in the presence of NaBH4. This biosynthetic method provided an advantageous pathway to fabricate bulk quantities of γ-Fe2O3 NPs and maybe extend their applications in different biotechnological applications.

ACS Style

Brajesh Kumar; Kumari Smita; Salome Galeas; Victor H. Guerrero; Alexis Debut; Luis Cumbal. One-Pot Biosynthesis of Maghemite (γ-Fe2O3) Nanoparticles in Aqueous Extract of Ficus carica Fruit and Their Application for Antioxidant and 4-Nitrophenol Reduction. Waste and Biomass Valorization 2020, 12, 3575 -3587.

AMA Style

Brajesh Kumar, Kumari Smita, Salome Galeas, Victor H. Guerrero, Alexis Debut, Luis Cumbal. One-Pot Biosynthesis of Maghemite (γ-Fe2O3) Nanoparticles in Aqueous Extract of Ficus carica Fruit and Their Application for Antioxidant and 4-Nitrophenol Reduction. Waste and Biomass Valorization. 2020; 12 (7):3575-3587.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Salome Galeas; Victor H. Guerrero; Alexis Debut; Luis Cumbal. 2020. "One-Pot Biosynthesis of Maghemite (γ-Fe2O3) Nanoparticles in Aqueous Extract of Ficus carica Fruit and Their Application for Antioxidant and 4-Nitrophenol Reduction." Waste and Biomass Valorization 12, no. 7: 3575-3587.

Rapid communications
Published: 11 September 2020 in Applied Physics A
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This article presents a simple and inexpensive method for the synthesis of SnO2 nanoparticles (SnO2 NPs) in the presence of non-toxic cochineal dye. As-synthesized nanoparticles were confirmed by various spectroscopic and microscopic techniques such as UV–Visible, XRD, FTIR, DLS and TEM. UV–Visible spectroscopy showed λmax for SnO2 NPs at 350 nm and it remains stable for 3 months at room temperature. The XRD result confirms the simultaneous presence of orthorhombic SnO2 (78%) and Sn (22%) nanoparticles. FTIR showed strong vibration at 543 and 598 cm−1 which corresponds to Sn–O of SnO2 NPs. The obtained TEM and DLS results stated the formation of the cube and spherical SnO2 NPs with an average diameter of about 30–50 nm. These particles do not aggregate in suspension because their outer surface is protected by an organic layer of cochineal. Approximately 83% methylene blue dye was degraded photocatalytically by SnO2 NPs within 180 min at a rate constant of 17.6001 × 10–3 min−1.

ACS Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. Synthesis and characterization of SnO2 nanoparticles using cochineal dye. Applied Physics A 2020, 126, 1 -9.

AMA Style

Brajesh Kumar, Kumari Smita, Alexis Debut, Luis Cumbal. Synthesis and characterization of SnO2 nanoparticles using cochineal dye. Applied Physics A. 2020; 126 (10):1-9.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. 2020. "Synthesis and characterization of SnO2 nanoparticles using cochineal dye." Applied Physics A 126, no. 10: 1-9.

Short communication
Published: 11 July 2020 in Inorganic Chemistry Communications
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In the present study, iron oxide nanoparticles (FeONPs) were firstly synthesized using non-edible peel extracts of Citrus paradisi, which is abundantly available in the Andean Region, Latin America. Characterizations techniques like Visual, U.V.–Vis spectroscopy, Dynamic Light Scattering (DLS), Transmission electron microscopy (TEM) with Selected area electron diffraction (SAED), X- ray diffraction (XRD) and Thermogravimetric analysis (TGA) were performed for characterization of as-prepared material in terms of size, morphology, composition and structure. Furthermore, based on the Fourier-transform infrared spectroscopy (FTIR) analysis, a possible synthesis mechanism was proposed for the synthesis of FeONPs. The DLS shows that the FeONPs with average size of 27.1 ± 13.9 nm and TEM analysis confirms that the FeONPs are mostly spherical shape, aggregating in nature with an average size of 28–32 nm, respectively. XRD confirmed the existence of Fe3O4, α-Fe2O3 and γ-Fe2O3 nanoparticle mixture, whereas TG analysis indicated that the nanoparticles contain 76% metal,16% adsorbed moisture and 8% capping ligand. Finally, as prepared iron nanoparticles exhibited antioxidant activities against 1, 1-diphenyl-2-picrylhydrazyl (>15%, 100 µg) and also they were used for the treatment of different synthetic dyes (Methyl Rose, MR; Methylene Blue, MB and Methyl Orange, MO) to evaluate their adsorbity. The different decolourization percentages were obtained for the dyes MR (96.65%, 50 mg/L), MB (80.76%, 10 mg/L) and MO (89.64%,10 mg/L), respectively for 6 h at 25 °C. As a result, the use of agricultural waste as Citrus paradisi peel in nanoscience offers a sustainable, low cost, non toxic and friendly to the environment compared to other synthetic methods.

ACS Style

Brajesh Kumar; Kumari Smita; Salome Galeas; Vishal Sharma; Victor H. Guerrero; Alexis Debut; Luis Cumbal. Characterization and application of biosynthesized iron oxide nanoparticles using Citrus paradisi peel: A sustainable approach. Inorganic Chemistry Communications 2020, 119, 108116 .

AMA Style

Brajesh Kumar, Kumari Smita, Salome Galeas, Vishal Sharma, Victor H. Guerrero, Alexis Debut, Luis Cumbal. Characterization and application of biosynthesized iron oxide nanoparticles using Citrus paradisi peel: A sustainable approach. Inorganic Chemistry Communications. 2020; 119 ():108116.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Salome Galeas; Vishal Sharma; Victor H. Guerrero; Alexis Debut; Luis Cumbal. 2020. "Characterization and application of biosynthesized iron oxide nanoparticles using Citrus paradisi peel: A sustainable approach." Inorganic Chemistry Communications 119, no. : 108116.

Journal article
Published: 06 June 2020 in Bioengineering
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In this work, Andean sacha inchi (Plukenetia volubilis L.) leaves were used to prepare monodispersed cuprous oxide (Cu2O) nanoparticles under heating. Visual color changes and UV-visible spectroscopy of colloidal nanoparticles showed λmax at 255 nm, revealing the formation of copper oxide nanoparticles. Transmission electron microscopy and dynamic light scattering analysis indicated that the prepared nanoparticles were spherical with an average size of 6–10 nm. The semi-crystalline nature and Cu2O phase of as-prepared nanoparticles were examined by X-ray diffraction. Fourier-transform infrared spectroscopy confirmed the presence of polyphenols, alkaloids and sugar in the sacha inchi leaf, allowing the formation of Cu2O nanoparticles from Cu2+. Additionally, as-synthesized Cu2O nanoparticles exhibited good photocatalytic degradation activity against methylene blue (>78%, 150 min) with rate constant 0.0219106 min−1. The results suggested that the adopted method is low-cost, simple, ecofriendly and highly selective for the synthesis of small Cu2O nanoparticles and may be used as a nanocatalyst in the future in the efficient treatment of organic pollutants in water.

ACS Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. Andean Sacha Inchi (Plukenetia Volubilis L.) Leaf-Mediated Synthesis of Cu2O Nanoparticles: A Low-Cost Approach. Bioengineering 2020, 7, 54 .

AMA Style

Brajesh Kumar, Kumari Smita, Alexis Debut, Luis Cumbal. Andean Sacha Inchi (Plukenetia Volubilis L.) Leaf-Mediated Synthesis of Cu2O Nanoparticles: A Low-Cost Approach. Bioengineering. 2020; 7 (2):54.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. 2020. "Andean Sacha Inchi (Plukenetia Volubilis L.) Leaf-Mediated Synthesis of Cu2O Nanoparticles: A Low-Cost Approach." Bioengineering 7, no. 2: 54.

Conference paper
Published: 19 February 2020 in Materials Today: Proceedings
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In this research article, we reported a clean and sustainable approach for the phytosynthesis of silver nanoparticles (AgNPs) by in situ reductions of Ag+ to Ag0 using an aqueous extract of Cabbage. The analytical characterizations using UV-vis spectroscopy, transmission electron microscopy, dynamic light scattering, and X-ray diffraction confirmed the successful synthesis of AgNPs. Spectroscopic and morphological studies revealed the formation of semi-crystalline, spherical AgNPs with size around 15–80 nm at λmax = 440 nm. The in vitro radical scavenging/ antioxidant property of as-synthesized AgNPs against DPPH· was enhanced with respect to Cabbage extract. The H2O2 sensing activity of AgNPs also found. Further, the obtained AgNPs show remarkable catalytic activity towards the reduction of 4-nitrophenol to 4-aminophenol in water. The catalytic conversion of 4-NP to 4-AP was studied in UV-vis spectroscopy. We concluded that the phytosynthesis of AgNPs by Cabbage extract is ecofriendly and have potential application as antioxidant, H2O2 sensor and nanocatalyst

ACS Style

Brajesh Kumar; Kumari Smita; Luis Cumbal; Alexis Debut. Phytosynthesis of Silver Nanoparticles using Andean Cabbage: Structural Characterization and its Application. Materials Today: Proceedings 2020, 21, 2079 -2086.

AMA Style

Brajesh Kumar, Kumari Smita, Luis Cumbal, Alexis Debut. Phytosynthesis of Silver Nanoparticles using Andean Cabbage: Structural Characterization and its Application. Materials Today: Proceedings. 2020; 21 ():2079-2086.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Luis Cumbal; Alexis Debut. 2020. "Phytosynthesis of Silver Nanoparticles using Andean Cabbage: Structural Characterization and its Application." Materials Today: Proceedings 21, no. : 2079-2086.

Articles
Published: 31 October 2019 in Spectroscopy Letters
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In the present study, we have utilized attenuated total reflectance Fourier transform infrared spectroscopy for the examination of raw, pasteurized and adulterated milk samples. Principal component analysis and discriminant analysis have been applied for discrimination and classification purposes. According to the observations and the model of “goodness of fit”, the obtained results explain 100% of the original classification of the dataset and leave one out cross-validation provides 93.74% of accurate classification.

ACS Style

Raj Kumar; Atamjot Kaur; Kashma Sharma; Brajesh Kumar; Vishal Sharma. On the examination of raw, pasteurized, powdered, and adulterated milk samples and their multivariate classification: applications in food and forensic science. Spectroscopy Letters 2019, 52, 583 -598.

AMA Style

Raj Kumar, Atamjot Kaur, Kashma Sharma, Brajesh Kumar, Vishal Sharma. On the examination of raw, pasteurized, powdered, and adulterated milk samples and their multivariate classification: applications in food and forensic science. Spectroscopy Letters. 2019; 52 (10):583-598.

Chicago/Turabian Style

Raj Kumar; Atamjot Kaur; Kashma Sharma; Brajesh Kumar; Vishal Sharma. 2019. "On the examination of raw, pasteurized, powdered, and adulterated milk samples and their multivariate classification: applications in food and forensic science." Spectroscopy Letters 52, no. 10: 583-598.

Editorial
Published: 30 January 2019 in Journal of Nanotechnology
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ACS Style

Rachid Seqqat; Lee Blaney; David Quesada; Brajesh Kumar; Luis Cumbal. Nanoparticles for Environment, Engineering, and Nanomedicine. Journal of Nanotechnology 2019, 2019, 1 -2.

AMA Style

Rachid Seqqat, Lee Blaney, David Quesada, Brajesh Kumar, Luis Cumbal. Nanoparticles for Environment, Engineering, and Nanomedicine. Journal of Nanotechnology. 2019; 2019 ():1-2.

Chicago/Turabian Style

Rachid Seqqat; Lee Blaney; David Quesada; Brajesh Kumar; Luis Cumbal. 2019. "Nanoparticles for Environment, Engineering, and Nanomedicine." Journal of Nanotechnology 2019, no. : 1-2.

Journal article
Published: 16 January 2019 in Progress in Organic Coatings
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Silver nanoparticles (AgNps) properties are affected due to the high surface area to volume ratio. The high thermal stability has been proved to be more efficient as antibacterial than bulk silver. Due to antibiotic resistance, the AgNps become a powerful weapon against the re-emergence of multidrug-resistant bacteria. The aim of this research article is to synthesize colloidal AgNps by a combination of ultrasonication and chemical reduction method using gallic acid and chitosan, respectively. Different spectroscopic and microscopic techniques were used to characterize the biophysical properties GC-AgNps. The results revealed that as-synthesized gallic acid- chitosan modified silver nanoparticles (GC-AgNps) were monodispersed, spherical shape with an average size of 26.23 ± 9.92 nm, and stable for four weeks without any noticeable change in size. The X-ray diffraction (XRD) analysis and Infrared spectroscopy (FTIR) confirmed that as-synthesized GC-AgNps were face-centered cubic (FCC) crystalline structures and the most prominent Ag-O vibrations at 599 cm−1. Further, GC-AgNps were studied for the antibacterial activity against Escherichia coli (E.coli) using a minimum inhibitory concentration at various concentrations of GC-AgNps. The sensibility caused by GC-AgNps against E. coli was 1 μg/mL after 120 min of exposure. The adopted method was rapid, facile and straightforward, affording stabilized GC-AgNPs that exhibited good antibacterial activity.

ACS Style

Katherine Guzmán; Brajesh Kumar; Maria Jose Vallejo; Marcelo Grijalva; Alexis Debut; Luis Cumbal. Ultrasound-assisted synthesis and antibacterial activity of gallic acid-chitosan modified silver nanoparticles. Progress in Organic Coatings 2019, 129, 229 -235.

AMA Style

Katherine Guzmán, Brajesh Kumar, Maria Jose Vallejo, Marcelo Grijalva, Alexis Debut, Luis Cumbal. Ultrasound-assisted synthesis and antibacterial activity of gallic acid-chitosan modified silver nanoparticles. Progress in Organic Coatings. 2019; 129 ():229-235.

Chicago/Turabian Style

Katherine Guzmán; Brajesh Kumar; Maria Jose Vallejo; Marcelo Grijalva; Alexis Debut; Luis Cumbal. 2019. "Ultrasound-assisted synthesis and antibacterial activity of gallic acid-chitosan modified silver nanoparticles." Progress in Organic Coatings 129, no. : 229-235.

Journal article
Published: 17 November 2018 in Vacuum
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Mortiño (Vaccinium floribundum Kunth) berry is an endemic fruit from the Andes region and rich in vitamins, polyphenolic and anthocyanin compounds. The present report describes the Mortiño berry extract mediated biosynthesis of silver nanoparticles and their photocatalytic evaluations. The conditions for the synthesis of silver nanoparticles were optimised by adjusting amount of berry extract, pH, and time. Biosynthesis of silver nanoparticles was primarily identified by the appearance of yellow colour and confirmed by measurements of UV–visible spectroscopy. Particle size distribution, morphology and crystalline nature of silver nanoparticles were characterised by transmission electron microscopy, dynamic light scattering, and X-ray diffraction techniques. All characterisation technique reveals that the generated silver nanoparticles were stable, non-aggregated, monodispersed, spherical shape with an average size of 20.5 ± 1.5 nm and face centred cubic in nature. In order to evaluate photocatalytic activity, degradation of methylene blue dye by silver nanoparticles under sunlight was used as model system. It showed photocatalytic activity against methylene blue dye (5 mg/L, k = 0.00707788 min−1), efficiently. This ecofriendly approach highlighted the importance of Mortiño berry in green nanotechnology and generates a new scope of other Andean fruits in engineering applications.

ACS Style

Brajesh Kumar; Karla Sofía Vizuete; Vishal Sharma; Alexis Debut; Luis Cumbal. Ecofriendly synthesis of monodispersed silver nanoparticles using Andean Mortiño berry as reductant and its photocatalytic activity. Vacuum 2018, 160, 272 -278.

AMA Style

Brajesh Kumar, Karla Sofía Vizuete, Vishal Sharma, Alexis Debut, Luis Cumbal. Ecofriendly synthesis of monodispersed silver nanoparticles using Andean Mortiño berry as reductant and its photocatalytic activity. Vacuum. 2018; 160 ():272-278.

Chicago/Turabian Style

Brajesh Kumar; Karla Sofía Vizuete; Vishal Sharma; Alexis Debut; Luis Cumbal. 2018. "Ecofriendly synthesis of monodispersed silver nanoparticles using Andean Mortiño berry as reductant and its photocatalytic activity." Vacuum 160, no. : 272-278.

Journal article
Published: 21 July 2018 in Environmental Nanotechnology, Monitoring & Management
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Green synthesis of nanoparticles using vegetable oil is growing interest in recent years. In this report, Persea americana (Avocado) oil is used to produce gold nanoparticles (AuNPs) in the presence of direct sunlight. The successful formation of AuNPs was confirmed by various analytical techniques including UV-vis spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The UV-vis spectra for as-synthesized AuNPs showed λmax = 520 nm, TEM, and DLS analysis depicted the formation of spherical, quasi-spherical, decahedral and triangular shape AuNPs of average size 48.8 ± 24.8 nm. FTIR analysis confirmed the AuNPs were capped with carboxylic acid (COOH) groups of fatty acid in an avocado oil. The prepared AuNPs also showed higher antioxidant activity than avocado oil against 1,1-diphenyl-2-picrylhydrazyl and photocatalytic decomposition of the methylene blue (>84%, 10 mg/L) under real sunlight, without using any reducing agent. The suggested synthetic method via microemulsion approach is clean, cost-effective and convenient in the development of future nanotechnology products.

ACS Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. Utilization of Persea americana (Avocado) oil for the synthesis of gold nanoparticles in sunlight and evaluation of antioxidant and photocatalytic activities. Environmental Nanotechnology, Monitoring & Management 2018, 10, 231 -237.

AMA Style

Brajesh Kumar, Kumari Smita, Alexis Debut, Luis Cumbal. Utilization of Persea americana (Avocado) oil for the synthesis of gold nanoparticles in sunlight and evaluation of antioxidant and photocatalytic activities. Environmental Nanotechnology, Monitoring & Management. 2018; 10 ():231-237.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Alexis Debut; Luis Cumbal. 2018. "Utilization of Persea americana (Avocado) oil for the synthesis of gold nanoparticles in sunlight and evaluation of antioxidant and photocatalytic activities." Environmental Nanotechnology, Monitoring & Management 10, no. : 231-237.

Dataset
Published: 29 March 2018 in nano Online
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This report describes a rapid, facile and an ecofriendly synthesis of silver nanoparticles (AgNps) using fruit extracts of Shora (Capparis petiolaris) and further as-synthesized AgNps were characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The effects of various other parameters such as pH, concentration of fruit extract, time, and change of light sources are studied. Analytical characterizations revealed that the sunlight-induced AgNps appeared at λmax=423 nm, had a spherical shape and varied in the range of 10–30 nm. Furthermore, AgNps showed moderate antioxidant activity against 2, 2-diphenyl-1-picrylhydrazyl (DPPH·) (38.98%, 0.125 mm) and photocatalytic activity for the degradation of methylene blue (MB) (>58%, 240 min). The results indicated that as-synthesized AgNps could be used in future engineering and biomedical products.

ACS Style

Karla Sofía Vizuete; Brajesh Kumar; Katherine Guzmán; Alexis Debut; Luis Cumbal. Shora (Capparis petiolaris) fruit mediated green synthesis and application of silver nanoparticles. nano Online 2018, 1 .

AMA Style

Karla Sofía Vizuete, Brajesh Kumar, Katherine Guzmán, Alexis Debut, Luis Cumbal. Shora (Capparis petiolaris) fruit mediated green synthesis and application of silver nanoparticles. nano Online. 2018; ():1.

Chicago/Turabian Style

Karla Sofía Vizuete; Brajesh Kumar; Katherine Guzmán; Alexis Debut; Luis Cumbal. 2018. "Shora (Capparis petiolaris) fruit mediated green synthesis and application of silver nanoparticles." nano Online , no. : 1.

Review
Published: 21 March 2018 in Unraveling the Safety Profile of Nanoscale Particles and Materials - From Biomedical to Environmental Applications
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Cell models for the study of antiproliferative and/or cytotoxic properties of engineered nanoparticles are valuable tools in cancer research. Several techniques and methods are readily available for the study of nanoparticles’ properties regarding selective toxicity and/or antiproliferative effects. Setting up of those techniques, however, needs to be carefully monitored. Harmonization of the wide range of methods available is necessary for assay comparison and replicability. Although individual or core laboratory capabilities play a role in selection and availability of techniques, data arising from cancer cell models are useful in guiding further research. The variety of cell lines available and the diversity of metabolic routes involved in cell responses make cell models suitable for the study of the biological effect of nanoparticles at the cell level and a valid approach for further and clinical studies. The present systematic review looks at the biological effects of different types of nanoparticles in cancer cell models.

ACS Style

Marcelo Grijalva; María José Vallejo-López; Lizeth Salazar; Javier Camacho; Brajesh Kumar. Cytotoxic and Antiproliferative Effects of Nanomaterials on Cancer Cell Lines: A Review. Unraveling the Safety Profile of Nanoscale Particles and Materials - From Biomedical to Environmental Applications 2018, 1 .

AMA Style

Marcelo Grijalva, María José Vallejo-López, Lizeth Salazar, Javier Camacho, Brajesh Kumar. Cytotoxic and Antiproliferative Effects of Nanomaterials on Cancer Cell Lines: A Review. Unraveling the Safety Profile of Nanoscale Particles and Materials - From Biomedical to Environmental Applications. 2018; ():1.

Chicago/Turabian Style

Marcelo Grijalva; María José Vallejo-López; Lizeth Salazar; Javier Camacho; Brajesh Kumar. 2018. "Cytotoxic and Antiproliferative Effects of Nanomaterials on Cancer Cell Lines: A Review." Unraveling the Safety Profile of Nanoscale Particles and Materials - From Biomedical to Environmental Applications , no. : 1.

Journal article
Published: 31 May 2017 in Arabian Journal of Chemistry
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In recent years, the development of efficient green chemistry methods for detoxification of metal poisoning has become a major focus of researchers. They have investigated in order to find an eco-friendly and recyclable technique for the removal of heavy metal (Pb2+, Hg2+) contamination from the natural resources. One of the most considered methods is the removal of Pb2+, Hg2+ metal using green plants and their wastes. Among these plant wastes seem to be the best candidates and they are suitable for detoxification of heavy metals. Biosorption by plants involve complex mechanisms, mainly ion exchange, chelation, adsorption by physical forces and ion entrapment in inter and intra fibrillar capillaries and spaces of the structural polysaccharide cell wall network. The advantages of using green plants and their wastes for detoxification of heavy metal have interested researchers to investigate mechanisms of metal ion uptake, and to understand the possible utilization. In this review, we discuss the role of plants and their wastes for minimizing mercury and lead pollution with their toxic effect on both human beings and plants.

ACS Style

Brajesh Kumar; Kumari Smita; Luis Cumbal Flores. Plant mediated detoxification of mercury and lead. Arabian Journal of Chemistry 2017, 10, S2335 -S2342.

AMA Style

Brajesh Kumar, Kumari Smita, Luis Cumbal Flores. Plant mediated detoxification of mercury and lead. Arabian Journal of Chemistry. 2017; 10 ():S2335-S2342.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Luis Cumbal Flores. 2017. "Plant mediated detoxification of mercury and lead." Arabian Journal of Chemistry 10, no. : S2335-S2342.

Journal article
Published: 01 January 2017 in Journal of Saudi Chemical Society
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This article describes a new approach for synthesis of silver nanostructured particles by using a Sacha inchi shell biomass (SISB). Sacha inchi shell biomass should be considered as an important source of phytochemicals for the synthesis and stabilization of silver nanoparticles (AgNPs). The characterization of AgNPs was performed by UV–vis spectroscopy, Transmission Electron Microscopy and Selected Area Electron Diffraction, indicating that AgNps were synthesized successfully with an average size of 7.2nm. Infrared spectrum measurements were carried out to hypothesize the possible biomolecules responsible for stabilization and capping of the silver nanoparticles. Then, AgNps were used as a catalyst in the presence of sunlight for the removal of methyl orange dye (MO, anionic dye) from aqueous solution. The results implied AgNps to be effective photocatalyst for the decomposition of MO (∼60%, pH 2.0) from aqueous solution

ACS Style

Brajesh Kumar; Kumari Smita; Luis Cumbal; Alexis Debut. Sacha inchi (Plukenetia volubilis L.) shell biomass for synthesis of silver nanocatalyst. Journal of Saudi Chemical Society 2017, 21, S293 -S298.

AMA Style

Brajesh Kumar, Kumari Smita, Luis Cumbal, Alexis Debut. Sacha inchi (Plukenetia volubilis L.) shell biomass for synthesis of silver nanocatalyst. Journal of Saudi Chemical Society. 2017; 21 ():S293-S298.

Chicago/Turabian Style

Brajesh Kumar; Kumari Smita; Luis Cumbal; Alexis Debut. 2017. "Sacha inchi (Plukenetia volubilis L.) shell biomass for synthesis of silver nanocatalyst." Journal of Saudi Chemical Society 21, no. : S293-S298.