scholarly journals SORPTION PROPERTIES OF THE MIXED STATIONARY PHASE ”POLYDIMETHYLSILOXANE-/beta-CYCLODEXTRIN” IN GAS CHROMATOGRAPHY

2017 ◽  
Vol 18 (3.1) ◽  
pp. 164-172
Author(s):  
V.I. Platonov ◽  
J.G. Kuraeva ◽  
L.A. Onuchak ◽  
D.M. Kazurov ◽  
I.S. Goncharova
Keyword(s):  
Gas Chromatography ◽  
Stationary Phase ◽  
Chromatographic Method ◽  
Polymer Phase ◽  
Beta Cyclodextrin ◽  
Mixed Stationary Phase ◽  
Cyclic Compounds ◽  
Polar Substituents ◽  
Gas Chromatographic Method

Sorption and selective properties of the mixed stationary phase based on polydimethylsiloxane and methylated-beta-cyclodextrin were studied by gas chromatographic method in the temperature range 60–180С. It is also established that introduction of macrocyclic adding in polymeric immovable phase results in increasing sorption of organic compounds of different classes (apart from n-alkanes C6-C10 and cyclogegsan) and showing of enantioselectivity, more pronounced for cyclic compounds with polar substituents. A greater role of entropy factors acting in the mixed polymer phase on the sorption of sorbates redistribution

Preparation of mixed stationary phase of cellulose and polysiloxane ionic liquid for gas chromatography

2014 ◽  
Vol 32 (10) ◽  
pp. 1117
Author(s):  
Gang CHEN ◽  
Xiaojie ZHAO ◽  
Jun XING ◽  
Yuhua YAO ◽  
Jingjing ZHENG
Keyword(s):  
Gas Chromatography ◽  
Ionic Liquid ◽  
Stationary Phase ◽  
Mixed Stationary Phase

The Importance of Alcohol Testing by Gas Chromatography vs the Cordebard Classical Method Modified in the Medico Legal Investigation

2018 ◽  
Vol 69 (9) ◽  
pp. 2407-2410
Author(s):  
Dan Perju Dumbrava ◽  
Carmen Corina Radu ◽  
Sofia David ◽  
Tatiana Iov ◽  
Catalin Jan Iov ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Method ◽  
Classical Method ◽  
Blood Alcohol Concentration ◽  
Alcohol Concentration ◽  
Blood Alcohol ◽  
Technical Details ◽  
Gas Chromatographic Method ◽  
Alcohol Testing ◽  
Living Person

Considering the growing number of requests from the criminal investigations authorities addressed to the institutions of legal medicine, testing of blood alcohol concentration both in the living person and in the corpse, we believe that a presentation of the two methods which are used in our country, is a topic of interest at present. The purpose of this article is to provide the reader with the technical details on how blodd alcohol concentration is realised by means of the gas chromatographic method and the classical one, (Cordebard modified by D. Banciu and I. Droc) respectively. Another purpose of this article is to also show, in a comparative way, the elements that make the gas chromatographic method superior to the former one.

Gas Chromatographic Determination of N-Butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-toluidine and α,α,α-Trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine in Formulations

1971 ◽  
Vol 54 (3) ◽  
pp. 711-712
Author(s):  
Martha Fuzesi
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Electron Capture ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Electron Capture Detector ◽  
Reference Solution ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for the quantitative determination of N-butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-tolindine and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyI-p-toluidine herbicides in formulations. The sample is extracted with benzene, and equal amounts of sample and reference solution in the same concentration range are analyzed by gas chromatography, using an electron capture detector and an SE-30/Diatoport S column. The method has been applied successfully to laboratory-prepared and commercial samples.

Antioxidants (BHA and BHT) in Breakfast Cereals

1965 ◽  
Vol 48 (4) ◽  
pp. 694-699
Author(s):  
David M Takahashi
Keyword(s):  
Gas Chromatography ◽  
Petroleum Ether ◽  
Chromatographic Method ◽  
Steam Distillation ◽  
Gas Chromatograph ◽  
Breakfast Cereals ◽  
Collaborative Studies ◽  
Different Types ◽  
Gas Chromatographic Method

Abstract Antioxidants (BHA and BHT) in different types of breakfast cereals were studied by argon ionization gas chromatography. Samples containing antioxidants were packed into the column, and antioxidants were eluted with redistilled petroleum ether. EIuates were concentrated under N2 and injected into a Barber-Colman Model 10 gas chromatograph. Recoveries ranged from about 92 to 110%. Results obtained by steam distillation-colorimetry methods were erratic. Colorimetric procedures were not free from interferences and could lead to highly erroneous results at the lower ppm levels. The gas chromatographic method is faster, simpler, and more accurate. Collaborative studies on corn and rice ready-to-eat breakfast cereals are recommended.

scholarly journals The Use of Cryogenic Temperature Gas Chromatography for the Determination of Carbon Monoxide and Carbon Dioxide in Cigarette Smoke

1972 ◽  
Vol 6 (4) ◽  
Author(s):  
G.P. Morie ◽  
C.H. Sloan
Keyword(s):  
Carbon Dioxide ◽  
Gas Chromatography ◽  
Carbon Monoxide ◽  
Liquid Nitrogen ◽  
Cigarette Smoke ◽  
Cryogenic Temperature ◽  
Chromatographic Method ◽  
Porapak Q ◽  
Gas Chromatographic Method

AbstractA gas chromatographic method for the determination of carbon monoxide and carbon dioxide in cigarette smoke was developed. A column containing Porapak Q packing and a cryogenic temperature programmer which employed liquid nitrogen to cool the column to subambient temperatures was used. The separation of N

Comparison of Emmerie-Engel Method and Gas Chromatographic Method for Determination of Supplemental α-Tocopheryl Acetate in Feed Concentrates

1987 ◽  
Vol 70 (3) ◽  
pp. 417-419
Author(s):  
Michael P Labadie ◽  
Charles E Boufford
Keyword(s):  
Gas Chromatography ◽  
Vitamin E ◽  
Coefficient Of Variation ◽  
Chromatographic Method ◽  
Tocopheryl Acetate ◽  
High Potency ◽  
Gc Analysis ◽  
Gas Chromatographic Method ◽  
Official Procedure

Abstract The determination of supplemental a-tocopheryl acetate in high potency vitamin E powders and oils was compared using the Emmerie- Engel method and gas chromatography (GC). The Emmerie-Engel reaction requires saponification, extraction of the saponiflable fracaon, and quantitation by colorimetry. GC analysis requires only an extraction and/or dilution before quantitation. These are represented essentially by AOAC methods 43.147-43.151 (colorimetry) and 43.152-43.159 (GC) for high potency vitamin E concentrates. Each method was statistically evaluated for precision and sample-to-sample reproducibility. Each Emmerie-Engel value was divided by the GC value obtained for the same sample; an average of 1.049 with a coefficient of variation of 2.89% was obtained. It was concluded that (he GC procedure was superior to the Emmerie-Engel method, and ahould be the official procedure for determination of supplemental a-tocopheryl acetate in feed concentrates.

Capillary Column Gas Chromatographic Determination of Trace Residues of the Herbicide Chlorsulfuron in Agricultural Runoff Water

1987 ◽  
Vol 70 (4) ◽  
pp. 745-748
Author(s):  
Uaz Ahmad
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Method ◽  
Capillary Column ◽  
Methylene Chloride ◽  
Chromatographic Determination ◽  
Agricultural Runoff ◽  
Runoff Water ◽  
Florisil Column ◽  
Gas Chromatographic Method

Abstract A capillary column gas chromatographic method is described for determining parts-per-trillion (ppt) levels of chlorsulfuron in agricultural runoff water. The water sample is acidified with acetic acid and extracted with methylene chloride. The chlorsulfuron in the extract is derivatized to its monomethyl derivative. After Florisil column cleanup, the methylated chlorsulfuron is determined by electron-capture gas chromatography. Recovery of chlorsulfuron from fortified water samples is greater than 80%. Detection limit of the method is 25 ng chlorsulfuron/L water (25 ppt). There are 2 reaction sites on the chlorsulfuron molecule, both of which are susceptible to methylation leading to monomethyl chlorsulfuron and dimethyl chlorsulfuron. A procedure is described to methylate selectively the sulfonamide nitrogen of chlorsulfuron.

The Confirmation of Diethylstilbestrol Residues in Beef Liver by Gas Chromatography-Mass Spectrometry

1975 ◽  
Vol 58 (3) ◽  
pp. 520-524
Author(s):  
Edgar W Day ◽  
Lynn E Vanatta ◽  
Robert F Sieck
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chromatographic Method ◽  
Gas Chromatography Mass Spectrometry ◽  
Confirmatory Test ◽  
Beef Liver ◽  
Isotope Pattern ◽  
Chromatography Mass Spectrometry ◽  
Growth Promoting ◽  
Gas Chromatographic Method

Abstract A confirmatory test for the presence of the growth-promoting hormone, diethylstilbestrol (DES), in beef liver is described. Samples are subjected to a published electron capture gas chromatographic method that involves the formation and measurement of the bis-dichloroacetyl derivative of DES. The presence of the derivative is then confirmed by gas chromatography-mass spectrometry, using a repetitive scanning technique to maximize response. The isotope pattern of the tetrachlorinated molecular ion greatly facilitates the confirmation.

Qualitative and Quantitative Determination of Methaqualone in Serum by Gas Chromatography

1974 ◽  
Vol 20 (2) ◽  
pp. 249-254 ◽  
Author(s):  
M A Evenson ◽  
G L Lensmeyer
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Chromatographic Method ◽  
Internal Standard ◽  
Serum Concentrations ◽  
Single Extraction ◽  
Qualitative And Quantitative ◽  
Gas Chromatographic Method ◽  
Isothermal Gas

Abstract A rapid, simple, accurate, and precise isothermal gas-chromatographic method is introduced for determination of methaqualone (2-methyl-3-o-tolyl-4(3H)-quinazolinone) in serum. A single extraction of 2 ml of serum, without derivative formation, will give adequate sensitivity for quantitation of therapeutic serum concentrations of the drug within 15 min. The method is free of interferences from biological substances, as well as from commonly used drugs. A non-drug internal standard compensates for variables in extraction, injection, and instrumental changes during analysis. The coefficient of variation, day-to-day, is 5.6%. Mean recovery of added methaqualone was 80%. To compensate for the nonquantitative yield and ensure accurate results, we prepared all analytical methaqualone standards in serum.

Rapid Gas Chromatographic Method for Quantitation of Ethchlorvynol ("Placidyl") in Serum

1974 ◽  
Vol 20 (2) ◽  
pp. 212-216 ◽  
Author(s):  
M A Evenson ◽  
M A Poquette
Keyword(s):  
Gas Chromatography ◽  
Correlation Coefficient ◽  
Chromatographic Method ◽  
Colorimetric Method ◽  
Healthy Controls ◽  
Serum Pool ◽  
Correlation Plot ◽  
Instrument Response ◽  
Gas Chromatographic Method ◽  
Sensitive Method

Abstract A rapid, simple, and sensitive method for quantitation of ethchlorvynol by gas chromatography has been developed. Instrument response is linear to a concentration of 200 mg/liter (2.0-ml sample of serum). Day-to-day (20 days) precision of a 15 mg/liter serum pool was 0.85 mg/liter (SD) and 5.6% (CV). For 30 samples analyzed by both the gas chromatographic method and a colorimetric method, the correlation plot had a slope of 0.989, x and y intercepts near zero, and a correlation coefficient of 0.997. Mean recovery of ethchlorvynol added to serum was 87%. Subsequently, all standards were prepared in serum, to compensate for the nonquantitative yield and to help assure accuracy. Sera from healthy controls and from hospitalized patients contain no endogenous interfering substances, nor did any of a series of commonly prescribed drugs interfere.

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