KARAKTERISASI FALOVONOID DARI DAUN BUNGO PERAK-PERAK (Begonia versicolar. Irmsch)

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Ermi Abriyani
Keyword(s):  
Melting Point ◽  
Ir Spectroscopy ◽  
Silica Gel ◽  
Wave Length ◽  
Yellow Powder ◽  
Flavonoid Compounds

ABSTRACT This research was conducted to isolate the compounds from Begonia versicolar Irmsch plants. Flavonoid compounds that produced from Begonia versicolar Irmsch is flavonol were isolated and purified by using silica gel and sephadex LH-20 and the melting point was observed. Characterization of isolated compounds was carried out by using the UV and IR spectroscopy. The purification results were yellow powder. The melting point is 195-197oC; and the wave length maximum are λmax of (MeOH) = 257nm, 357 nm. Keywords; Flavonol, Begonia versicolar Irmsch., melting point, UV and IR spectroscopy ABSTRAK Penelitian ini dilakukan untuk mengisolasi senyawa dari tanaman Begonia versicolor Irmsch. Senyawa flavonoid yang dihasilkan dari Begonia versicolar Irmsch adalah flavonol yang diisolasi dan dimurnikan dengan menggunakan silica gel dan sephadex LF-20 dan diamati titik lelehnya. Karakterisasi senyawa yang telah diisolasi dilakukan dengan menggunakan spektroskopi UV dan IR. Hasil purifikasinya adalah serbuk kuning. Titik lelehnya 195-197oC dan panjang gelombang maksimum, λmax dalam MeOH = 257 nm , 357 nm. Kata kunci; Flavonol, Begonia versicolar Irmsch., titik leleh, Spektroskopi UV dan IR

Preparation and Characterization of LLM-105 Cocrystal Explosives

2014 ◽  
Vol 900 ◽  
pp. 251-255 ◽  
Author(s):  
Shu Hai Zhang ◽  
Hai Long Zhao
Keyword(s):  
Melting Point ◽  
Ir Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Cocrystal explosive can effectively improve the physical and chemical properties of explosive and contributed to new unique properties of cocrystal explosive. Based on cocrystal principle, a few recrystallization explosives of LLM-105 were prepared using solvent/non-solvent technique. The prepared samples were analyzed by IR spectroscopy. The results showed that cocrystals such as LLM-105/ HNIW, LLM-105/HMX and LLM-105/RDX can be prepared. Melting point and density of the cocrytals above changed little. It can be inferred the cocrystal explosive will have better energy and their application performances will not reduce obviously.

Preparation and Characterization of Biodiesel from Karanja Oil by Using Silica Gel Reactor

2014 ◽  
Author(s):  
Sukanta Mondal ◽  
Kaniz Ferdous ◽  
M. Rakib Uddin ◽  
Maksudur R. Khan ◽  
M. A. Islam ◽  
...  
Keyword(s):  
Silica Gel ◽  
Karanja Oil

Elaboration and Characterization of the Properties of Refractory Cr Base Alloys

2010 ◽  
Vol 72 ◽  
pp. 46-52 ◽  
Author(s):  
Laurent Royer ◽  
Stéphane Mathieu ◽  
Christophe Liebaut ◽  
Pierre Steinmetz
Keyword(s):  
Mechanical Properties ◽  
Melting Point ◽  
Molten Glass ◽  
Energy Production ◽  
Creep Properties ◽  
Refractory Alloys ◽  
Industrial Use ◽  
Kinetics Of ◽  
Selection Of

For energy production and also for the glass industry, finding new refractory alloys which could permit to increase the process temperatures to 1200°C or more is a permanent challenge. Chromium base alloys can be good candidates, considering the melting point of Cr itself, and also its low corrosion rate in molten glass. Two families of alloys have been studied for this purpose, Cr-Mo-W and Cr-Ta-X alloys (X= Mo, Si..). A finer selection of compositions has been done, to optimize their chemical and mechanical properties. Kinetics of HT oxidation by air, of corrosion by molten glass and also creep properties of several alloys have been measured up to 1250°C. The results obtained with the best alloys (Cr-Ta base) give positive indications as regards the possibility of their industrial use.

scholarly journals Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1301
Author(s):  
Zully J. Suárez Montenegro ◽  
Gerardo Álvarez-Rivera ◽  
Jose A. Mendiola ◽  
Elena Ibáñez ◽  
Alejandro Cifuentes
Keyword(s):  
Aluminum Oxide ◽  
Silica Gel ◽  
Supercritical Co2 ◽  
Olive Leaves ◽  
Fractionation Process ◽  
Selective Enrichment ◽  
Adsorption Desorption ◽  
First Time ◽  
By Products

This work reports the use of GC-QTOF-MS to obtain a deep characterization of terpenoid compounds recovered from olive leaves, which is one of the largest by-products generated by the olive oil industry. This work includes an innovative supercritical CO2 fractionation process based on the online coupling of supercritical fluid extraction (SFE) and dynamic adsorption/desorption for the selective enrichment of terpenoids in the different olive leaves extracts. The selectivity of different commercial adsorbents such as silica gel, zeolite, and aluminum oxide was evaluated toward the different terpene families present in olive leaves. Operating at 30 MPa and 60 °C, an adsorbent-assisted fractionation was carried out every 20 min for a total time of 120 min. For the first time, GC-QTOF-MS allowed the identification of 40 terpenoids in olive leaves. The GC-QTOF-MS results indicate that silica gel is a suitable adsorbent to partially retain polyunsaturated C10 and C15 terpenes. In addition, aluminum oxide increases C20 recoveries, whereas crystalline zeolites favor C30 terpenes recoveries. The different healthy properties that have been described for terpenoids makes the current SFE-GC-QTOF-MS process especially interesting and suitable for their revalorization.

Electrospun PU/MgO/Ag Nanofibers for Antibacterial Activity and Flame Retardency

2021 ◽  
pp. 0887302X2110094
Author(s):  
V. Mamtha ◽  
H. N. Narasimha Murthy ◽  
V. Pujith Raj ◽  
Prashantha Tejas ◽  
C. S. Puneet ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Melting Point ◽  
Protective Clothing ◽  
Electrospun Nanofibers ◽  
Synthesis And Characterization ◽  
Zone Of Inhibition ◽  
Solution Combustion ◽  
E Coli ◽  
Afterglow Time

Antibacterial activity and fire retardation are equally desired for protective clothing. For achieving this, AgNP and MgO are independently researched as nanofillers in Polyurethane based electrospun nanofibers and their synergistic effect is scarcely addressed. This article reports synthesis and characterization of MgO of 70.01 nm and AgNP of 51 to 76 nm by solution combustion and hydrothermal routes respectively and their incorporation in electrospinning of Polyurethane. Flow rate 1 ml/hr, applied voltage 13 kV, tip to collector distance 15 cm were adopted for the electrospinning. Nanofibers of 65 nm were obtained for PU/MgO (3 wt. %) and 106 nm for PU/MgO (3 wt. %)/Ag (1 wt. %). Addition of MgO increased the melting point, after flame time and afterglow time. Incorporation of AgNP improved antibacterial activity. PU/MgO/Ag (2 wt. %) exhibited zone of inhibition of 2.1 cm and 3 cm against E. Coli and S. Aureus, respectively.

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