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Synthesis of novel and diverse mollugin analogues and their antibacterial and antioxidant activities
Idhayadhulla, A.,Xia, L.,Lee, Y.R.,Kim, S.H.,Wee, Y.J.,Lee, C.S. Academic Press ; Academic Press 2014 Bioorganic chemistry Vol.52 No.-
Novel and diverse mollugin analogues (1-12) were synthesized using PhB(OH)<SUB>2</SUB>/AcOH-mediated electrocyclization reaction as a key step. The newly synthesized compounds were screened for antioxidant and antibacterial activities. Compounds 1, 2, 5, 6, 8, and 10-12 showed high antioxidant activities in DPPH inhibition (IC<SUB>50</SUB>=0.52-1.11μM) compared with BHT (IC<SUB>50</SUB>=9.67μM). Compounds 3 exhibited potent antibacterial activity against Staphylococcus aureus (KCTC-1916) bacterial strain at 100μg/mL. Structures of newly synthesized compounds were confirmed by IR, <SUP>1</SUP>H NMR, <SUP>13</SUP>C NMR data and high-resolution mass spectrometry.
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.
Xia, L.,Idhayadhulla, A.,Lee, Y.R.,Kim, S.H.,Wee, Y.J. Korean Society of Industrial and Engineering Chemi 2015 Journal of industrial and engineering chemistry Vol.22 No.-
Diverse 3,5,6,7-tetrahydrobenzofuran-4-one derivatives (3a-3n) were synthesized in high yields by ruthenium complex or rhodium complex catalyzed [3+2] cycloaddition. The antibacterial activities of these 3,5,6,7-tetrahydrobenzofuran-4-ones were evaluated against Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Enterobacter aerogenes) and Gram-positive bacteria (Bacillus cereus and Staphylococcus aureus). In particular, compound 3b showed the highest antibacterial activity against P. aeruginosa and S. aureus (both MICs: 2μg/mL). Compound 3l, which has the 2H-pyrano[2,3-b]benzofuran skeleton, exhibited excellent inhibitory activity against B. cereus (MIC: 0.5μg/mL) as compared with ciprofloxacin (MIC: 2μg/mL) and ampicillin (MIC: 1μg/mL).
하립개,Akber Idhayadhulla,이용록,김성홍,위영중 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Diverse 3,5,6,7-tetrahydrobenzofuran-4-one derivatives (3a–3n) were synthesized in high yields byruthenium complex or rhodium complex catalyzed [3 + 2] cycloaddition. The antibacterial activities ofthese 3,5,6,7-tetrahydrobenzofuran-4-ones were evaluated against Gram-negative bacteria (Escherichiacoli, Pseudomonas aeruginosa, and Enterobacter aerogenes) and Gram-positive bacteria (Bacillus cereus andStaphylococcus aureus). In particular, compound 3b showed the highest antibacterial activity against P. aeruginosa and S. aureus (both MICs: 2 mg/mL). Compound 3l, which has the 2H-pyrano[2,3-b]benzofuran skeleton, exhibited excellent inhibitory activity against B. cereus (MIC: 0.5 mg/mL) ascompared with ciprofloxacin (MIC: 2 mg/mL) and ampicillin (MIC: 1 mg/mL).
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.
Xia, Likai,Idhayadhulla, Akber,Lee, Yong Rok,Kim, Sung Hong,Wee, Young-Jung American Chemical Society 2014 ACS Combinatorial Science Vol.16 No.7
<P>With the aim of developing a general and practical method for library production, a novel and efficient two-phase microwave-assisted cascade reaction between isatins and beta-ketoamides in [Bmim]BF4/toluene was developed for the synthesis of pyrrolo[3,4-c]quinoline-1,3-diones. The features of this methodology are, the use of microwave-assisted rapid synthesis, mild reaction conditions, high yields, operational simplicity, facile product separation, and recyclability. Furthermore, the antibacterial activities of the pyrrolo[3,4-c]quinoline-1,3-dione derivatives produced were evaluated against Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Enterobacter aerogenes) and Gram-positive bacteria (Bacillus cereus and Staphylococcus aureus). These derivatives showed antibacterial activities against Gram-positive strains that were at least equivalent to that against Gram-negative strains. Compound 7{3,5} displayed the most potent antibacterial activity against P. aeruginosa (MIC = 0.5 mu g/mL) and greater activity than standard ampicillin (MIC = 1 mu g/mL). Compound 7{4,7} exhibited the best inhibitory activity against E. coli and E. aerogenes (MIC = 1 and 0.5 mu g/mL), compared with the standard ampicillin (both MICs = 1 mu g/mL). The synthesized pyrrolo[3,4-c]quinoline-1,3-diones are expected to be widely used as lead compounds for the development of new antibacterial agents.</P>
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.