The volatilities and conductivities of ionic liquids — GC–MS methodology and preliminary studies of acetic acid – base systems

2006 ◽  
Vol 84 (6) ◽  
pp. 915-924 ◽  
Author(s):  
Ronald G Treble ◽  
Keith E Johnson ◽  
Evangeline Tosh
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Acetic Acid ◽  
Ionic Liquids ◽  
Binary Systems ◽  
Gas Chromatography Mass Spectrometry ◽  
Acid Base ◽  
The Third ◽  
Acidic Proton ◽  
First Case

Gas chromatography – mass spectrometry studies of the headspaces above the binary systems pyridine (bp 115 °C) – acetic acid (bp 116 °C), 1-methylimidazole (bp 198 °C) – acetic acid, and triethylamine (bp 89 °C) – acetic acid show both components in the first case, acetic acid only in the second, and triethylamine only in the third. Negative deviations from Raoult's law are confirmed and proton transfer is evidenced by the downfield shift of the acidic proton as the addition of base proceeds. Specific conductances >2 mS cm–1 are found over wide composition ranges for all three systems with values >8 mS cm–1 at high (>2) mole ratios of acetic acid, suggesting the formation of acetatohydrogenate ionic liquids.Key words: GC–MS, air, vapor pressure, conductivity, ionic liquids, acetic acid.

scholarly journals GAS CHROMATOGRAPHY-MASS SPECTROMETRY ANALYSIS OF AN ENDANGERED MEDICINAL PLANT, SARCOSTEMMA VIMINALE (L.) R.BR. FROM THAR DESERT, RAJASTHAN (INDIA)

2017 ◽  
Vol 10 (9) ◽  
pp. 210 ◽  
Author(s):  
Arora Sunita ◽  
Meena Sonam ◽  
Kumar Ganesh
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Acetic Acid ◽  
Medicinal Plants ◽  
Maximum Amount ◽  
Mass Spectrometry Analysis ◽  
Gas Chromatography Mass Spectrometry ◽  
World Population ◽  
Thar Desert ◽  
Chromatography Mass Spectrometry

  Objective: Sarcostemma viminale (L.) R. Br. is one of the important endangered medicinal plants belonging to the family Asclepiadaceae. The aim of the present investigation was to determine the possible bioactive phytochemicals from stem of S. viminale (L.) R. Br. using methanol, chloroform, and hexane as solvents.Methods: Plant material was collected from typical conditions of Indian Thar Desert in the month of July-September, 2016. This plant always grows in association with the congeneric plant, Euphorbia caducifolia. The phytochemical compounds were investigated using Perkin-Elmer gas chromatography-mass spectrometry, while the mass spectra of the compounds found in the extract were matched with the National Institute of Standards and Technology library.Results: Maximum % area is found for Lup-20-(29)-en-3-yl acetate is present maximum amount (40.85%) with reaction time (RT)=43.787 minutes, followed by 4, 4, 6A, 6B, 8A, 11, 11, 14B-octamethyl-1, 4, 4A, 5, 6, 6A, 6B, 7, 8, 8A, 9, 10, 11, 12, 12A, 14, 14A, 14B-octadecahydro-2H-picen-3- one$$olean-12-en-3-one# (13.74%) with RT=44.420 minutes in the methanolic extract; acetic acid 4, 4, 6A, 8A, 11, 12, 14B-octamethyl-1, 2, 3, 4, 4A, 5, 6, 6A, 6B, 7, 8, 8A, 9, 10, 11, 12, 12A, 14, 14A, 14B-eicosahydro-picen-3-yl ester $$ urs-12-en-3-yl acetate is present maximum amount (44.98%) with RT=48.265 minutes, followed by. beta.-amyrin (18.51%) with RT=40.580 minutes in the chloroform extract; acetic acid 4, 4, 6A, 8A, 11, 12, 14B-octamethyl-1, 2, 3, 4, 4A, 5, 6, 6A, 6B, 7, 8, 8A, 9, 10, 11, 12, 12A, 14, 14A, 14B-eicosahydro-picen-3-yl ester $$ urs-12-en-3-yl acetate is present maximum amount (45.47%) with RT=48.514 minutes, followed by. beta.-amyrin (19.21%) with RT=40.555 minutes in the hexane extract of stem of S. viminale (L.) R. Br.Conclusion: Medicinal plants contain one or more substances that can be used for therapeutic purpose; they are used by the world population for their basic health needs. The importance of the study is to investigate the pinpoint biological activity of some of these compounds so that they can be used by pharma or some other drug designing industry to find a novel drug.

scholarly journals PEMBUATAN BIOADITIF TRIACETIN DENGAN KATALIS PADAT SILICA ALUMINA

2017 ◽  
Vol 5 (2) ◽  
pp. 101-109 ◽  
Author(s):  
Agus Aktawan ◽  
Zahrul Mufrodi
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Acetic Acid ◽  
Reaction Time ◽  
Biodiesel Production ◽  
Gas Chromatography Mass Spectrometry ◽  
Solid Catalyst ◽  
Heating Unit ◽  
Glycerol Conversion ◽  
Silica Alumina

Triasetin is a bioaditif to increase the octane number of the gasoline. Triasetin was generated from the reaction between giserol and acetic acid. Glycerol is a byproduct of biodiesel production. Triasetin production can reduce glycerol which is actually a waste by converting it into bioaditif having higher value. The reaction can be accelerated by addition of catalysts either solid or liquid catalyst. The reaction in this study used a solid catalyst types Silica Alumina. The reaction takes place in the three-neck flask reactor which is equipped with heating unit, mixers, and tools to take samples at regular intervals. Variables used in this research is the variety of reaction time and the reaction temperature (70, 80, 90, 100, and 1100C). The concentration of triasetin obtained will be known through the analysis of Gas Chromatography - Mass Spectrometry (GC-MS). The results of the analysis of GC or GC-MS treated or counted so getting glycerol conversion and selectivity of triasetin. The highest glycerol conversion 8,45% occurs at a temperature of 700C the reaction time of 90 minutes with triasetin selectivity 100%.

scholarly journals Home-made cider brandy (Calvados): analysis of distillation fractions by gas chromatography-mass spectrometry method

Chemija ◽  
2021 ◽  
Vol 32 (3-4) ◽  
Author(s):  
Indrė Vaičikauskytė ◽  
Vilius Poškus ◽  
Vytautas Nekrošius ◽  
Vida Vičkačkaitė ◽  
Aivaras Kareiva
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Isoamyl Alcohol ◽  
Gas Chromatography Mass Spectrometry ◽  
Spectrometry Method ◽  
Mass Spectrometry Method ◽  
The Third ◽  
Chromatography Mass Spectrometry ◽  
Main Fraction ◽  
Chromatographic Mass

In this study, the distillation fractions of cider brandy produced illegally in Lithuania using gas chromatographic-mass spectrometry method were investigated. The conditions of gas chromatography-mass spectrometry were firstly optimized. A qualitative analysis of three distillation fractions was performed and estimated. The first fraction (initial) of distillation products was collected for 0.5 h, the second one (intermediate) was collected for the next 1.5 h and the third (main) fraction for the next 5 h. A method of the quantitative analysis of different volatile analytes such as acetaldehyde, methanol, ethanol, 1-propanol, isobutanol, 1-butanol, isoamyl alcohol and benzyl alcohol in the distillation products was also developed. The concentration of ethanol decreased significantly in the main fraction in comparison with those of the initial and intermediate fractions. The concentration of 1-propanol, isobutanol, 1-butanol and isoamyl alcohol in the last fraction decreased drastically as well.

Analysis of the acid and neutral fractions present in Carramboa tachirensis (Aristeg.) Cuatrec. (Asteraceae) by Gas Chromatography-Mass Spectrometry

2021 ◽  
Author(s):  
Ysbelia M. Obregón ◽  
Luis B Rojas ◽  
Rosa L Aparicio ◽  
Alfredo Usubillaga
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Diethyl Ether ◽  
Gas Chromatography Mass Spectrometry ◽  
Acid Fraction ◽  
Acid Base ◽  
Chromatography Mass Spectrometry

The genus Carramboa (family Asteraceae) comprises seven species, among which is the Carramboa tachirensis (Aristeg.) (Cuatrec.), species endemic to the Andean paramos. In this paper we prepared an extract of n-hexane: diethyl ether (3:1) from dried leaves of the plant then followed a march acid-base, yielding two fractions: an acid, which was methylated, and one neutral. Both were analyzed by Gas Chromatography-Mass Spectrometry. The identification was made by comparison with authentic standards and with the use of databases Wiley (6th Edition), Nist 05, and Adams. Compounds identified were: ent-kaur-16-en-19-oic acid (11.16 %), ent-kauran-19-oic acid (9.18 %) and ent-15α-hydroxy-16-en-kaur-19-oic acid (17.03 %) of the acid fraction and ent-kaur-16-en-19-ol (2.63 %), epi-ruilopeziol (5.19 %) and 16

scholarly journals Identification of New Metabolites of Bacterial Transformation of Indole by Gas Chromatography-Mass Spectrometry and High Performance Liquid Chromatography

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Pankaj Kumar Arora ◽  
Hanhong Bae
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
High Performance Liquid Chromatography ◽  
Acetic Acid ◽  
Liquid Chromatography ◽  
High Performance ◽  
Glyoxylic Acid ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Indole 3 Acetic Acid

Arthrobactersp. SPG transformed indole completely in the presence of an additional carbon source. High performance liquid chromatography and gas chromatography-mass spectrometry detected indole-3-acetic acid, indole-3-glyoxylic acid, and indole-3-aldehyde as biotransformation products. This is the first report of the formation of indole-3-acetic acid, indole-3-glyoxylic acid, and indole-3-aldehyde from indole by any bacterium.

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