Volume 3 (2020) Issue 1

Author(s): Aisha Batool1, Farah Kanwal2, Shahzad Ahmad3, Sumreen Asim4, Murtaza Saleem5
1School of Physical Sciences, University of the Punjab, Lahore 54590, Pakistan.
2Institute of Chemistry, University of the Punjab, Lahore-54590, Pakistan
3School of Economics and Management, Beijing Forestry University, Beijing-100083, China
4Khwaja Fareed University of Engineering and Information Technology, Department of Chemistry, 64200-RYK, Pakistan.
5Department of Physics, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences (LUMS), 54792-Lahore, Pakistan.
Abstract:

In this research, we reported facile synthesis of efficient \(Ni_3Fe\) electrocatalyst nanostructures deposited on conducting carbon fibers surface by a simple chemical bath deposition method at moderate temperature. The composition, phase and electrocatalytic property of as-prepared binder-free electrocatalyst was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and electrochemical measurements. The as-synthesized \(Ni_3Fe@t-CF\) presented excellent performance and durability as water oxidation electrocatalyst in alkaline electrolyte owing to non-segregated deposition of \(Ni_3Fe\) nanostructures on conducting surface of carbon, high electrochemical surface area, and the fast absorption and desorption of water molecules during oxygen evolution reaction due to the \(3D\) architecture of conducting interlaced carbon fibers template.

Author(s): Francesco Saverio Robustelli della Cuna1,2, Ilaria Bruni3, Morena L. Martínez4, Marvin J. Núnez5
1Department of Drug Sciences, University of Pavia, via Taramelli 12, 27100, Pavia, Italy.;
2ZooPlantLab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2,I-20126, Milano, Italy
3ZooPlantLab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2,I-20126, Milano, Italy.
4Laboratorio de Investigación en Productos Naturales, Facultad de Química y Farmacia, Universidad de El Salvador, Final Av. de Mártires y Héroes del 30 de Julio, San Salvador 1101, El Salvador
5Laboratorio de Investigación en Productos Naturales, Facultad de Química y Farmacia, Universidad de El Salvador, Final Av. de Mártires y Héroes del 30 de Julio, San Salvador 1101, El Salvador.
Abstract:

Couroupita guianensis Aubl. (Lecythidaceae) “Cannonball tree” is a tropical plant with ethnobotanical uses. The present study is focused on analyzing the essential oil composition of Couroupita guianensis (C. guianensi) fresh flowers collected in El Salvador. Steam distillation, coupled with GC/FID and GC/MS analysis were employed to characterize the chemical composition and in vitro antioxidant activity study were carried out using DPPH assay. Eugenol was identified to be the most abundant constituent and quantified as \(46.20\)% of the total volatiles. Other constituents were found to be \(2\)-phenylethanol \((34.82\)%), \((E)-(E)\)-farnesol \((5.53\)%), nerol \((3.95\)%), geraniol \((3.20\)%), benzyl alcohol \((1.77\)%). \(DPPH\) assay showed a dose-dependent antioxidant activity. The study demonstrated that C. guianensis essential oil from El Salvador is a rich source of eugenol, which may be responsible for its antioxidant properties. Based on these results, further studies on the antibacterial and antifungal activity of C. guianensis essential oil are of fundamental importance.