Detection of Radiation-Induced Hydrocarbons in Camembert Irradiated before and after the Maturing Process-Comparison of Florisil Column Chromatography and Online Coupled Liquid Chromatography-Gas Chromatography

1995 ◽  
Vol 43 (2) ◽  
pp. 372-376 ◽  
Author(s):  
Grit Schulzki ◽  
Almuth Spiegelberg ◽  
Klaus W. Boegl ◽  
Georg A. Schreiber
Keyword(s):  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Column Chromatography ◽  
Florisil Column ◽  
Process Comparison ◽  
Before And After ◽  
Florisil Column Chromatography ◽  
Radiation Induced

Detection of Radiation-Induced Hydrocarbons and 2-Alkylcyclobutanones in Irradiated Perilla Seeds

2000 ◽  
Vol 63 (11) ◽  
pp. 1563-1569 ◽  
Author(s):  
HAE-JUNG LEE ◽  
MYUNG-WOO BYUN ◽  
KYONG-SU KIM
Keyword(s):  
Gas Chromatography ◽  
Oleic Acid ◽  
Linoleic Acid ◽  
Mass Spectroscopy ◽  
Column Chromatography ◽  
Irradiation Dose ◽  
Florisil Column ◽  
Florisil Column Chromatography ◽  
Radiation Induced ◽  
Gas Chromatography Mass Spectroscopy

The method consists of the extraction of fat from perilla seeds, separation of hydrocarbons and 2-alkylcyclobutanones with florisil column chromatography, and identification of hydrocarbons and 2-alkylcyclobutanones by gas chromatography–mass spectroscopy (GC-MS). Concentrations of hydrocarbons and 2-alkylcyclobutanones increased with the irradiation dose. The major hydrocarbons in the irradiated perilla seeds were 8-heptadecene and 1,7-hexadecadiene from oleic acid and 6,9-heptadecadiene and 1,7,10-hexadecatriene from linoleic acid. One of the 2-alkylcyclobutanones, 2-(5′-tetradecenyl)cyclobutanone, was found in the highest concentration in the irradiated perilla seeds. Radiation-induced hydrocarbons in the perilla seeds were detected at doses of 0.5 kGy and higher, and radiation-induced 2-alkylcyclobutanones were detected at doses of 1 kGy and higher. These compounds were not detected in nonirradiated perilla seeds.

Multiresidue Method for Determining Substituted Urea Herbicides in Foods by Liquid Chromatography

1987 ◽  
Vol 70 (4) ◽  
pp. 740-745
Author(s):  
Ronald G. Luchtefeld
Keyword(s):  
Liquid Chromatography ◽  
Standard Deviation ◽  
Column Chromatography ◽  
Food Products ◽  
Chemical Derivatization ◽  
Florisil Column ◽  
Average Recovery ◽  
Multiresidue Method ◽  
Florisil Column Chromatography ◽  
Substituted Urea

Abstract A method is described for determining substituted urea herbicides in foods. The residues are extracted from the product with methanol, and the food coextractives are removed by using solvent partitioning and Florisil column chromatography. The extract is analyzed using liquid chromatography with postcolumn photodegradation, chemical derivatization with orthophthalaldehyde, and spectrofluorometry. Recoveries were determined by spiking 8 different food products with 6 phenylureas—chlorbromuron, chloroxuron, diuron, fluometuron, linuron, and metobromuron—at 0.05 and 0.5 ppm. Three determinations were made at each level for each product. Average recovery at 0.05 ppm was 95% (with a standard deviation of 7.9%), and at 0.5 ppm, 98% (with a standard deviation of 6.9%).

Multiresidue Method for Determining Substituted Urea Herbicides in Foods by Liquid Chromatography

1987 ◽  
Vol 70 (4) ◽  
pp. 740-745
Author(s):  
Ronald G Luchtefeld
Keyword(s):  
Liquid Chromatography ◽  
Standard Deviation ◽  
Column Chromatography ◽  
Food Products ◽  
Chemical Derivatization ◽  
Florisil Column ◽  
Average Recovery ◽  
Multiresidue Method ◽  
Florisil Column Chromatography ◽  
Substituted Urea

Abstract A method is described for determining substituted urea herbicides in foods. The residues are extracted from the product with methanol, and the food coextractives are removed by using solvent partitioning and Florisil column chromatography. The extract is analyzed using liquid chromatography with postcolumn photodegradation, chemical derivatization with orthophthalaldehyde, and spectrofluorometry. Recoveries were determined by spiking 8 different food products with 6 phenylureas—chlorbromuron, chloroxuron, diuron, fluometuron, linuron, and metobromuron—at 0.05 and 0.5 ppm. Three determinations were made at each level for each product. Average recovery at 0.05 ppm was 95% (with a standard deviation of 7.9%), and at 0.5 ppm, 98% (with a standard deviation of 6.9%).

Separation and quantitation of 3,3′,4,4′-tetrachlorobiphenyl and 3,3′,4,4′,5,5′-hexachlorobiphenyl in aroclors using florisil column chromatography and gas-liquid chromatography

1979 ◽  
Vol 23 (1) ◽  
pp. 51-56 ◽  
Author(s):  
LaVerne R. Kamops ◽  
William J. Trotter ◽  
Susan J. Young ◽  
Audrey C. Smith ◽  
John A. G. Roach ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Column Chromatography ◽  
Gas Liquid Chromatography ◽  
Florisil Column ◽  
Florisil Column Chromatography

Analysis of Radiation-Induced Hydrocarbons and 2-Alkylcyclobutanones from Dried Shrimps (Penaeus aztecus)

2004 ◽  
Vol 67 (1) ◽  
pp. 142-147 ◽  
Author(s):  
KYONG-SU KIM ◽  
HYE-YOUNG SEO ◽  
JEONG-MIN LEE ◽  
EUN-RYONG PARK ◽  
JUN-HYOUNG KIM ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Gas Chromatography ◽  
Oleic Acid ◽  
Gas Chromatography Mass Spectrometry ◽  
Radiation Doses ◽  
Florisil Column ◽  
Penaeus Aztecus ◽  
Florisil Column Chromatography ◽  
Radiation Induced

We investigated the usefulness of hydrocarbons and 2-alkylcyclobutanones as markers for irradiated, dried shrimps. A method was developed to detect the irradiation of dried shrimps ( Penaeus aztecus) by identifying radiation-induced hydrocarbons and 2-alkylcyclobutanones extracted from dried shrimps, which were separated by Florisil column chromatography and identified by a method using gas chromatography/mass spectrometry. Radiation-induced hydrocarbons and 2-alkylcyclobutanones are formed from the fatty acids of the irradiated fats. The quantity of the hydrocarbons and 2-alkylcyclobutanones formed from some fatty acids is related to the composition of fatty acids in a sample. The concentrations of hydrocarbons and 2-alkylcyclobutanones increased with radiation dose. The major hydrocarbons in the irradiated, dried shrimps were 1-tetradecene and pentadecane from palmitic acid; small amounts of heptadecane and 1-hexadecene from stearic acid; and 8-heptadecene and 1,7-hexadecadiene from oleic acid. 2-(5′-Tetradecenyl)cyclobutanone, one of the 2-alkylcyclobutanones, was present at the highest concentration. The radiation-induced hydrocarbons and 2-alkylcyclobutanones were detected at radiation doses of 0.5 kGy and greater. These compounds were not detected in nonirradiated, dried shrimps.

Determination of Chlorinated Pesticide Residues in Foods. III. Simultaneous Analysis of Chlorinated Pesticide and Phthalate Ester Residues by Using AgNO3-Coated Florisil Column Chromatography for Cleanup of Various Samples

1979 ◽  
Vol 62 (3) ◽  
pp. 689-694
Author(s):  
Takashi Suzuki ◽  
Kiyoshi Ishikawa ◽  
Nobutoshi Sato ◽  
Kei-Ichi Sakai
Keyword(s):  
Column Chromatography ◽  
Phthalate Esters ◽  
Ethanol Solution ◽  
Simultaneous Analysis ◽  
Phthalate Ester ◽  
Florisil Column ◽  
Vegetable Samples ◽  
Chemical Residues ◽  
Florisil Column Chromatography ◽  
Rice Samples

Abstract A simplified method suitable for simultaneous analysis of chlorinated pesticide and phthalate ester residues in various foods was developed. Chemical residues were quantitatively extracted from fatty and vegetable samples with acetonitrile as follows: Chemical standard in 0.5 mL ethanol solution was added to 10 g homogenized sample. After 3 hr, pork and beef were extracted 3 times with 20 mL portions of acetonitrile. The acetonitrile layers were diluted with water and extracted with n-hexane. Rice samples were combined with 10 mL water, 5 mL acetonitrile, and 1 mL ethanol and extracted 3 times with 20 mL portions of n-hexane. The re-hexane concentrate from each sample was submitted to AgNO3-coated Florisil column chromatography. The AgNO3 coating adequately adsorbed interfering coextractives. Extracts of fish and vegetable samples were separated into 2 fractions by the above column chromatography. Supplemental cleanup procedures were also developed to accurately determine phthalate esters eluted in the second fraction. Satisfactory gas chromatograms were obtained for most samples.

A Method for Fractional Determination of Soybean Sterols in Four Classes by Florisil Column Chromatography

1974 ◽  
Vol 38 (9) ◽  
pp. 1661-1667
Author(s):  
Masayuki Katayama ◽  
Ching Tsang Hou ◽  
Norman C. Chen ◽  
Takako Hirota ◽  
Toshiko Kiribuchi ◽  
...  
Keyword(s):  
Column Chromatography ◽  
Florisil Column ◽  
Florisil Column Chromatography

scholarly journals Comparative Study of Dark Beer Before and After Freeze Drying Rehydration Cycle

2018 ◽  
Vol 72 (2) ◽  
pp. 123-127
Author(s):  
Ingmārs Cinkmanis ◽  
Guntis Gailums ◽  
Sanita Vucāne
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Phenolic Compounds ◽  
Organic Acids ◽  
High Performance ◽  
Freeze Drying ◽  
Gas Chromatography Mass Spectrometry ◽  
Before And After

Abstract The aim of the study was to compare dark beer before and after a freeze drying rehydration cycle. The pH, colour, and concentrations of extract, organic acids, and phenolic compounds were determined. Dark beer before and after freeze drying was analysed using standard brewing analysis methods of the Mitteleuropäische Brautechnische Analysenkommision (MEBAK) and two types of chromatography: high-performance liquid chromatography (HPLC) and gas chromatography mass spectrometry (GC/MS). Increase of pH was not observed in dark beer after freeze drying. Dissolved powdered beer in deionised water was clear, dark brown, without sediments, and reproduced the original commercially available dark beer, with original extract substance content 8.88%. Concentrations of the following organic acids were determined: oxalic, tartaric, quinic, malic, ascorbic, lactic, acetic, citric, fumaric, and succinic. Volatile compounds by GC/MS analysis were isolated from dark beer before and after freeze drying.

Automated Sample Cleanup for Pesticide Multiresidue Analysis. Part II—Design and Evaluation of Column Chromatography Module

1984 ◽  
Vol 67 (4) ◽  
pp. 783-789
Author(s):  
Fred M Gretch ◽  
Joseph D Rosen
Keyword(s):  
Column Chromatography ◽  
Pesticide Residues ◽  
Continuous Flow ◽  
Flow System ◽  
Organophosphorus Pesticides ◽  
Multiresidue Analysis ◽  
Florisil Column ◽  
Continuous Flow System ◽  
Florisil Column Chromatography ◽  
Organochlorine And Organophosphorus Pesticides

Abstract An automated, continuous flow system is described for Florisil column chromatography of pesticide residues from food extracts. Evaluation of the system using 5 common organochlorine and organophosphorus pesticides in 2 crop matrices demonstrates essentially no difference in recovery or precision between automated and currently used manual analyses. The automated procedure uses only 20% of the solvents and adsorbents used in the manual procedure and is 3 times faster.

scholarly journals A method for fractional determination of soybean sterols in four classes by florisil column chromatography.

1974 ◽  
Vol 38 (9) ◽  
pp. 1661-1667 ◽  
Author(s):  
Masayuki KATAYAMA ◽  
Ching Tsang HOU ◽  
Norman C. CHEN ◽  
Takako HIROTA ◽  
Toshiko KIRIBUCHI ◽  
...  
Keyword(s):  
Column Chromatography ◽  
Florisil Column ◽  
Florisil Column Chromatography
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