Pharmacological and Phytochemical Assessment of Anagallis arvensis L. Leaf Extracts

The present study elucidates anti-inflammatory potential and biochemical activity via 2,2′-diphenyl-1-picrylhydrazyl scavenging potential (DPPH), total antioxidant activity (TAA), ferric reducing antioxidant power (FRAP), ferrous chelating activity (FCA), total phenolic content (TPC), total flavonoid content (TFC) of aqua-methanol (AqM) and aqua-acetone (AqA) extracts of Anagallis arvensis L. leaf along with mineral content (AAS) and quantitative phytochemicals (FT-IR and GC-MS). AqM extract exhibited maximum anti-inflammatory activity (82.90 ± 0.91%), DPPH (65.06 ± 1.87%), TAA (46.85 ± 7.32 μg VCE/mg), FRAP (73.82 ± 1.21 μg TE/mg), TPC (104.17 ± 1.41 μg GAE/mg); while AqA showed maximum FCA (64.77 ± 1.61%) and TFC (19.12 ± 1.24 μg QE/mg). FT-IR spectra of AqM extract ranged from 1020.58 to 3853.42 cm-1. The major six phytochemicals investigated through GC-MS were 9-octadecenoic acid (Z)-methylester; 2-hexadecen-1-ol-3,7,11,15-tetramethyl- [R-[R*,R*-(E)]]; methyl elaidate; 2-methoxy-4-vinylphenol; 9-octadecenamide-(Z)-; and benzoic acid 2-hydroxy-phenylmethyl ester exhibiting antioxidant and anti-inflammatory properties. The present investigation characterizes the pharmacognostic and phytochemical profile of A. arvensis leading towards its futuristic significance in pharmaceutical and nutraceutical industries.

Self-Metathesis of Methyl Oleate Using Ru-NHC Complexes: A Kinetic Study

A kinetic study concerning the self-metathesis of methyl oleate and methyl elaidate was performed, using a variety of NHC-ruthenium pre-catalysts, bearing either mesityl groups or di-isopropyl-phenyl groups on the NHC ligand and various trans ligands with respect to the NHC unit. We showed that the system can be satisfactorily described using one initiation constant per pre-catalyst and four propagation constants that, conversely, do not depend on the pre-catalyst. The difference of reactivity with oleate (Z) and elaidate (E) can be fully explained by the propagation parameters; the studied pre-catalysts initiate with the same rate starting from the Z or the E olefin. The ranking of the propagation parameters is driven by the thermodynamic equilibrium. The transformation rates of Z and E isomers is only driven by these propagation constants and nothing differentiates the initiation step.

Synthesis of Sodium Zirconia as a Catalyst for Transesterification Reaction of Used Cooking Oil

Catalyst is one of factor that affect the results of the transesterification reaction. Catalyst has spesific properties that can only be used in certain reaction. In order to carry out the transesterification reaction a suitable catalyst is needed and has optimal performance. This research aims to synthesize sodium zirconia (Na2O/ZrO2) as a catalyst for transesterification reaction of used cooking oil into biodiesel and the effect of the concentration of NaOH solution on the zirconia catalyst (ZrO2). The sodium zirconia catalyst(Na2O/ZrO2) was synthesized by wet impregnation method by mixing ZrO2 and NaOH solution with variations in concentrations of 2, 4 and 6 M. Transesterification reaction is carried out with catalyst amount of 5%(w/w), with areaction time of 20 minutes, and by microwave heating at 400 watt microwave power. The comparison of oil molar with methanol was 1:15. Na2O/ZrO2 catalysts was characterized by Fourier Transform Infrared(FT-IR) Spectrophotometer, and X-Ray Diffractometer (XRD) and Scanning Electron Microscopy/Energy Dispersive X-ray (SEM/EDX). The resulting biodiesel was characterized by Gas Chromatography-Mass Spectrometry (GC-MS). Using Na2O/ZrO2 2 M catalysts produced the most biodiesel which was 85.5% (w/w). The formed biodiesel contained methyl palmitate (25,11%), methyl linoleate (10,87%), methyl elaidate (57,88%), and methyl stearate (6,14%). The characterization results showed that Na2O/ZrO2 as the transesterification used cooking oil catalyst was successfully synthesized.

CATALYTIC ACTIVITY OF CALCIUM OXIDE FROM FISHBONE WASTE IN WASTE COOKING OIL TRANSESTERIFICATION PROCESS

Calcium oxide was obtained from waste fish bones that has been carried out systematically by decomposition at various temperatures that 800oC, 900oC and 1000oC for 4 hours. Calcium oxide from the decomposition process was characterized using XRD, FTIR, SEM EDX and SAA. The result of XRD Diffractogram showed that the crystallinity increased as the calcination temperature increased. The absorption bands in the FTIR spectra of calcium oxide from calcined waste fish bones shown at 355 cm-1 region indicated CaO vibration, which was reinforced by the emergence of a peak at 859 cm-1. Based on the analysis using SEM EDX, the calcined waste fish bones typically irregular particles and contained dominant calcium element. The low value of BET surface area and the total of pore volume were consistent with the adsorption measurement with SAA. The calcium oxide was applied for biodiesel synthesis from Waste cooking oil through transesterification reaction. The result of the optimization that the calcium oxide was decomposed from waste fish bones at 900oC. It exhibited best catalytic activity in the transesterification of waste cooking oil providing maximum biodiesel yield of 93% at 4% (w/v) of catalyst loading. The decomposition of biodiesel are determined by GC MS that produced methyl palmitate, methyl linoleate, methyl elaidate, methyl linoleolate, methyl stearate and methyl linolenate.

Study on Chemical Constituents of the Vietnamese Medicinal Plant Fissistigma petelotii

A new bisabolene derivative (1S*, 2R*, 4R*, 7R*, 10R*)-1,7,10,11-tetrahydroxy-1,7,11-trimethyl- 4,10(H)-2-O-cinnamoyl-bisabol-8(9)-ene (1), together with cinnamic acid (2), methyl cinnamate (3), sodium cinnamate (4) and methyl elaidate (5) have been isolated from the leaves and barks of Fissistigma petelotii. Sodium cinnamate (4) was isolated for the first time from the nature. The structures of these compounds were elucidated by analysis of their IR, MS, 1D and 2D NMR spectra.