Experimental and Modeling Studies on the Solubility of 2-Chloro-N-(4-methylphenyl)propanamide (S1) in Binary Ethyl Acetate + Hexane, Toluene + Hexane, Acetone + Hexane, and Butanone + Hexane Solvent Mixtures Using Polythermal Method

2017 ◽  
Vol 62 (10) ◽  
pp. 3193-3205 ◽  
Author(s):  
Gladys Kate Pascual ◽  
Philip Donnellan ◽  
Brian Glennon ◽  
Vamsi Krishna Kamaraju ◽  
Roderick C. Jones
Keyword(s):  
Ethyl Acetate ◽  
Solvent Mixtures ◽  
Modeling Studies ◽  
Acetone Hexane

Reversed phase behaviour of high molecular mass polystyrenes in ethyl acetate solvent mixtures

1994 ◽  
Vol 39 (11-12) ◽  
pp. 663-667 ◽  
Author(s):  
R. A. Shalliker ◽  
P. E. Kavanagh ◽  
I. M. Russell
Keyword(s):  
Ethyl Acetate ◽  
Molecular Mass ◽  
Reversed Phase ◽  
High Molecular Mass ◽  
Phase Behaviour ◽  
Solvent Mixtures

Determination of Organophosphorus Nematicide Residues in Banana-Field Soils by Gas Chromatography/Mass Spectrometry

1994 ◽  
Vol 77 (6) ◽  
pp. 1580-1586
Author(s):  
Jean-François Cooper ◽  
Shan-Qiang Zheng ◽  
Nigel R Wynn ◽  
Louis Palcy
Keyword(s):  
Ethyl Acetate ◽  
West Indies ◽  
Solid Phase ◽  
Mass Spectrometric ◽  
Gas Chromatography Mass Spectrometry ◽  
Solvent Mixtures ◽  
Phase Extraction ◽  
Field Soils ◽  
Chromatographic Mass

Abstract Gas chromatographic/mass spectrometric (GC/MS) methodology is presented for the determination, in banana-field soils, of the 4 most used organophosphorus nematicides in Martinique (French West Indies): cadusafos (Rugby), ethoprophos (Mocap), isazophos (Miral), and fenamiphos (Nemacur). After extraction with 2 successive solvent mixtures, ethyl acetate–dichloromethane (8 + 2, v/v) and ethyl acetate–acetone (7 + 3, v/v), cleanup was performed using solid-phase extraction cartridges (silica SPE). Fenamiphos and its metabolites were separated in the second eluate and then oxidized to sulfone. Analysis was performed by GC/MS in fragmentometric mode. Recoveries varied from about 75 to 90%. Limits of quantitation varied from 4 to 20 μg/kg fresh soil sample, depending on the nematicide.

scholarly journals Anti-hypercholesterolemic agent from Indonesian rice bran

2019 ◽  
Vol 10 (4) ◽  
pp. 2733-2738
Author(s):  
Syaikhul Aziz ◽  
Elfahmi ◽  
Andreanus Andaja Soemardji ◽  
Sukrasno
Keyword(s):  
Solvent Extraction ◽  
Ethyl Acetate ◽  
Mass Spectroscopy ◽  
Rice Bran ◽  
Total Cholesterol Level ◽  
Hexane Extract ◽  
Binary Solvents ◽  
Serum Total Cholesterol Level ◽  
Isolated Compound ◽  
Acetone Hexane

This research was conducted to determine the total oryzanol content of various extracts and bioassay-guided isolation of active anti-hypercholesterolemic agent from Indonesian rice bran. Hot solvent extraction was done by reflux method using single and binary solvents, namely hexane, chloroform, ethyl acetate, dichloromethane, isopropanol, acetone, hexane-ethyl acetate (1:1, v/v), hexane-isopropanol (1:1, v/v), and chloroform-ethyl acetate (1:1, v/v). TLC densitometric was used to quantitatively analyze the total oryzanol content in various extracts. The hexane extract was selected for fractionation and evaluated for their anti-hypercholesterolemic activity. The structure of an isolated compound was determined on the basis of NMR and Mass spectroscopy. The total oryzanol content was obtained using various solvents ranging from 27.92 to 43.59 mg/100g rice bran, in which hexane extract showed the highest amount (43.59 ± 3.36 mg/100g rice bran). β-sitosterol has been isolated from rice bran hexane extract, which shows a significant decrease in serum total cholesterol level. In summary, hexane is the best solvent to extract oryzanol compound using reflux method, and β-sitosterol was suspected to be responsible for anti-hypercholesterolemic activity in addition to existing compound such as oryzanol that contained in the rice bran.

scholarly journals ISOLATION ANTHOCYANIN FROM ROSELLE PETALS (Hibiscus sabdariffa L) AND THE EFFECT OF LIGHT ON THE STABILITY

2012 ◽  
Vol 12 (2) ◽  
pp. 167-171 ◽  
Author(s):  
Siti Nuryanti ◽  
Sabirin Matsjeh ◽  
Chairil Anwar ◽  
Tri Joko Raharjo
Keyword(s):  
Ethyl Acetate ◽  
Solvent Mixtures ◽  
Hibiscus Sabdariffa ◽  
Light Conditions ◽  
Color Test ◽  
Ft Ir ◽  
The Stability ◽  
Nonpolar Compounds ◽  
Dark Room ◽  
Effect Of Light

This study was conducted to isolate anthocyanins from roselle petals and testing the stability toward light. Isolation of anthocyanin was accomplished by extracting roselle petals using eluents with different polarity levels. Nonpolar compounds was eliminated using n-hexane, then semipolar compounds extracted with ethyl acetate and isolated anthocyanin by solvent mixtures of methanol-HCl 0.5%. Color test to determine the presence of anthocyanin was performed with NH3 vapor, Pb-acetate 1% and Pb-nitrate 5%. The structure of anthocyanin in the roselle flower was determined using UV-Vis spectrophotometer, FT-IR and 1H-NMR. Anthocyanin stability test of the influence of light carried out in a room without light conditions (dark room) and light 25 Watt at 31 °C. The results showed that the roselle petals contain anthocyanin cyanidin-3-glucoside. Light has been found to affect the stability of anthocyanin cyanidin-3-glucoside.

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