Antioxidant and Anti-tyrosinase Activities of Palladium Nanoparticles Synthesized Using Saururus chinensis

Basavegowda, Nagaraj,Mishra, Kanchan,Lee, Yong Rok,Kim, Sung Hong Springer-Verlag 2016 Journal of cluster science Vol.27 No.2

<P>This paper reports the phytosynthesis of palladium nanoparticles (PdNPs) using a Saururus chinensis (S. chinensis) leaf extract, which is believed to act as a bioreductant and stabilizer. Ultraviolet/visible spectroscopy was performed to confirm the formation of PdNPs. Fourier transform infrared spectroscopy was performed to recognize the possible bioactive molecules, such as polyphenols and flavonoids present in the S. chinensis leaf extract responsible for the reduction and stabilization of PdNPs. X-ray diffraction revealed the crystallinity of the nanoparticles. The mean particle size and their elemental composition were determined by transmission electron microscopy coupled with energy dispersive X-ray analysis (EDS). The PdNPs were spherical in shape with a mean size of similar to 4 nm. The EDS showed strong optical absorption peak at similar to 2.8 keV, confirmed the formation of PdNPs. The PdNPs exhibited moderate antioxidant and potent antityrosinase activities. [GRAPHICS] .</P>

Synthesis of silver nanoparticles using Satsuma mandarin (Citrus unshiu) peel extract: A novel approach towards waste utilization

Basavegowda, N.,Rok Lee, Y. North-Holland 2013 Materials letters Vol.109 No.-

Silver nanoparticles (AgNPs) were synthesized using Satsuma mandarin (Citrus unshiu) peel extract without adding external surfactant and capping agent. Aqueous silver (Ag<SUP>+</SUP>) ions when exposed to Satsuma mandarin peel extract were reduced and formed silver nanoparticles in the size range 5-20nm. The AgNPs produced were characterized by UV-visible, X-ray diffraction (XRD), transmission electron microscopy (TEM), and by energy dispersive X-ray analysis (EDX). This study demonstrates the feasibility of using fruit wastes for the synthesis of AgNPs.

Green fabrication of ferromagnetic Fe₃O₄ nanoparticles and their novel catalytic applications for the synthesis of biologically interesting benzoxazinone and benzthioxazinone derivatives

Basavegowda, Nagaraj,Somai Magar, Krishna Bahadur,Mishra, Kanchan,Lee, Yong Rok The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.11

<P>This paper demonstrates a novel and green approach for the synthesis of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles using the leaf extract of <I>Artemisia annua</I> (<I>A. annua</I>), which is widely distributed in Asia as a medicinal plant. The formation of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles was observed by UV-Vis spectroscopy. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDAX), Fourier transform infrared (FT-IR) spectroscopy, vibrating sample magnetometry (VSM), and thermogravimetric analysis (TGA). TEM analysis of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles showed that they were spherical in shape with an average size of 6 nm. The synthesized Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles were used as a catalyst for the preparation of biologically interesting benzoxazinone and benzthioxazinone derivatives in high yields. These results showed that the synthesized Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles could be used as a catalyst in organic synthesis.</P> <P>Graphic Abstract</P><P>The <I>Artemisia annua</I> leaf extract acts as a bioreductant for the synthesis of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles, which have been used as a nanocatalyst for the preparation of benzoxazinone and benzthioxazinone derivatives. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj01155d'> </P>

Preparation of Au and Ag nanoparticles using Artemisia annua and their in vitro antibacterial and tyrosinase inhibitory activities

Basavegowda, N.,Idhayadhulla, A.,Lee, Y.R. Elsevier 2014 Materials Science and Engineering C Vol.43 No.-

This work describes a plant-mediated approach to the preparation of metal nanoparticles using leaf extract of Artemisia annua (A. annua), an ethno-medicinal plant widely found in Asia, which was used as reducing and stabilizing agent. A. annua is used in traditional Chinese medicine to alleviate fever. Au and Ag nanoparticles were prepared using a one-step aqueous method at room temperature without any toxic chemicals. The formation of Au and Ag nanoparticles was monitored by UV-vis spectroscopy. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), Fourier transform infrared (FT-IR) spectroscopy, and thermogravimetric analysis (TGA). TEM analysis of Au nanoparticles showed that they had triangular and spherical shapes with sizes ranging from 15 to 40nm. The silver nanoparticles were predominantly spherical and uniformly sized (30-50nm). The Au and Ag nanoparticles produced showed significant tyrosinase inhibitory and antibacterial effects. These results suggest that the synthesized nanoparticles provide good alternatives in varied medical and industrial applications.

Phyto-synthesis of gold nanoparticles using fruit extract of Hovenia dulcis and their biological activities

Basavegowda, N.,Idhayadhulla, A.,Lee, Y.R. Elsevier 2014 INDUSTRIAL CROPS AND PRODUCTS Vol.52 No.-

The authors describe the synthesis of gold nanoparticles (GNPs) at room temperature using an aqueous extract of Hovenia dulcis fruit and the antioxidant and antibacterial activities of the GNPs obtained. The devised method provides a simple, cost-effective aqueous means of producing spherical and hexagonal GNPs of size ~20nm. The synthesized GNPs were characterized by UV-vis spectrum and obtain a peak at 536nm. Fourier transform infrared (FT-IR) spectroscopy results showed that the extract containing some biomolecules accountable for both reducing as well as capping gold ions into GNPs. Transmission electron microscopic (TEM) studies of the particles revealed a dominance of spherical particles with a very few hexagonal GNPs. The face centered cubic structure of the GNPs was confirmed by X-ray diffraction (XRD) peaks at 38<SUP>o</SUP>, 44<SUP>o</SUP>, 64<SUP>o</SUP> and 77<SUP>o</SUP>, which were indexed to the (111), (200), (220), and (311) planes with clear circular spots in the selected area electron diffraction (SAED). Elemental analysis was performed by energy dispersive X-ray analysis (EDX). In addition, the authors investigated in vitro antioxidant and antibacterial properties of the biosynthesized GNPs, which were found to be significant.

Sonochemical Green Synthesis of Yttrium Oxide (Y2O3) Nanoparticles as a Novel Heterogeneous Catalyst for the Construction of Biologically Interesting 1,3-Thiazolidin-4-ones

Basavegowda, N.,Mishra, K.,Thombal, R. S.,Kaliraj, K.,Lee, Y. R. Springer Science + Business Media 2017 Catalysis letters Vol.147 No.10

Synthesis of Gold and Silver Nanoparticles Using Leaf Extract of Perilla Frutescens-A Biogenic Approach

Basavegowda, N.,Lee, Y.R. American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.6

The present investigation demonstrates a rapid biogenic approach for the synthesis of gold and silver nanoparticles using biologically active and medicinal important Perilla frutescens leaf extract as a reducing and stabilizing agent under ambient conditions. Gold and silver nanoparticles were first synthesized from Perilla frutescens leaf extract which was used as a vegetable and in traditional medicines for a long time in Korea, Japan, and China. The nanoparticles obtained were characterized by UV-vis spectroscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. Surface plasmon resonance spectra of gold and silver nanoparticles were obtained at 540 and 430 nm and triangular and spherical shape respectively. TEM studies showed that the particle sizes of gold and silver nanoparticles ranges similar to 50 nm and similar to 40 nm respectively. X-ray diffraction studies confirm that the biosynthesized nanoparticles were crystalline gold and silver. Fourier transform infra-red spectroscopy revealed that biomolecules were involved in the synthesis and capping of the nanoparticles produced. XRD and EDX confirmed the formation of gold and silver nanoparticles. This is a simple, efficient and rapid method to synthesize gold and silver nanoparticles at room temperature without use of toxic chemicals. Obtained gold and silver nanoparticles can be used in various biomedical and biotechnological applications.

Tyrosinase inhibitory activity of silver nanoparticles treated with Hovenia dulcis fruit extract: An in vitro study

Basavegowda, N.,Idhayadhulla, A.,Lee, Y.R. North-Holland 2014 Materials letters Vol.129 No.-

This work describes a novel approach for the preparation of silver nanoparticles (AgNPs) using Hovenia dulcis fruit bodies, as opposed to physical and chemical methods. The active phytochemicals present in the extract reduced silver ions (Ag<SUP>+</SUP>) to AgNPs (Ag<SUP>0</SUP>). The results of UV-vis spectrum, transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) revealed that the synthesized AgNPs were in the size range of 40-50nm. In addition, the synthesized AgNPs were evaluated for their tyrosinase inhibitory activity using L-DOPA as the substrate with significant results.

Trimetallic FeAgPt alloy as a nanocatalyst for the reduction of 4-nitroaniline and decolorization of rhodamine B: A comparative study

Basavegowda, Nagaraj,Mishra, Kanchan,Lee, Yong Rok Elsevier 2017 Journal of alloys and compounds Vol.701 No.-

<P><B>Abstract</B></P> <P>Novel FeAgPt alloy nanoparticles were biosynthesized <I>via</I> ultra-sonication using the root extract of <I>Platycodon grandiflorum</I>. The nanoparticles exhibited enhanced catalytic activities in the reduction of 4-nitroaniline (4-NA) to <I>p</I>-phenylenediamine with a significantly reduced reaction time and increased rate constant because of their high number of active surface sites. In addition, the same catalyst exhibited enhanced catalytic activity in the decolorization of an environment polluting dye, rhodamine B (RhB). The time taken for the complete conversion of 4-NA to <I>p</I>-phenylenediamine was 25 min with an apparent rate constant of 10.06 × 10<SUP>−2</SUP> min<SUP>−1</SUP>. Similarly, the catalytic decolorization of RhB took 15 min for complete decolorization of the dye molecules with a rate constant 25.60 × 10<SUP>−2</SUP> min<SUP>−1</SUP>. The performance difference of mono, bi and trimetallic nanoparticles for both the reduction of 4-NA and decolorization of RhB was also examined. These trimetallic alloy nanostructures with excellent catalytic efficiency can also be used for other applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> FeAgPt alloy nanoparticles were prepared using a green method <I>via</I> ultrasonication. </LI> <LI> The synthesized nanoparticles were well characterized by XRD and TEM. </LI> <LI> The alloy nanoparticles showed the best catalytic reduction activity compared to mono and bimetallic nanoparticles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Magnetically Separable Iron Oxide Nanoparticles: An Efficient and Reusable Catalyst for Imino Diels–Alder Reaction

Nagaraj Basavegowda,미스라칸찬,이용록,Young-Gull Joh 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.2

Iron oxide nanoparticles were synthesized using Saururus chinensis (S. chinensis) leaf extract as a reducing and stabilizing agent via ultrasonication. The size, morphology, crystallinity, elemental composition, weight loss, surface chemical state, and magnetic properties of the synthesized nanoparticles were investigated. The synthesized nanoparticles were used as an efficient and recyclable catalyst for the synthesis of a variety of 2-methyl-4-substituted-1,2,3,4-tetrahydroquinoline derivatives by the imino Diels–Alder reaction. After the reaction, the catalyst was recovered by an external magnetic field. The recovered catalyst was then reused in a subsequent reaction under identical conditions. The recycled iron oxide nanoparticles (IONPs) were reused five times without any significant loss of catalytic activity.