A simple method for the gas-chromatographic determination of the most common hypnotics in the same extract of serum

1978 ◽  
Vol 290 (2) ◽  
pp. 155-155 ◽  
Author(s):  
W. R. Külpmann
Keyword(s):  
Chromatographic Determination ◽  
Simple Method

Simple liquid-chromatographic determination of urinary coproporphyrin in workers exposed to lead.

1986 ◽  
Vol 32 (5) ◽  
pp. 872-873 ◽  
Author(s):  
K Tomokuni ◽  
Y Hirai
Keyword(s):  
High Performance ◽  
Chromatographic Determination ◽  
Hplc Method ◽  
Simple Liquid ◽  
Fluorescence Detector ◽  
Liquid Chromatograph ◽  
Simple Method ◽  
Liquid Chromatographic ◽  
Urinary Coproporphyrin

Abstract We developed a simple method for the determination of urinary coproporphyrin (CP) in lead workers, using a "high-performance" liquid chromatograph (HPLC) equipped with a fluorescence detector. The detection limit of urinary CP in this method was 5 micrograms per liter of urine. The working linear range of urinary CP concentration was 5 to 1500 micrograms/L. In 41 lead-exposed workers, the urinary CP values obtained by the present HPLC method were well correlated with those obtained by a conventional spectrophotometric method (r = 0.94). The present method is useful for screening workers exposed to lead.

Chromatographic Determination of Mineral Oil in Pesticide Formulations

1973 ◽  
Vol 56 (1) ◽  
pp. 14-16
Author(s):  
Giuseppe Trombetti ◽  
Tullio Gordini
Keyword(s):  
Column Chromatography ◽  
Chromatographic Determination ◽  
Mineral Oil ◽  
Simple Method ◽  
Pesticide Formulations

Abstract A simple method is described for the determination of mineral oil in emulsified concentrates, based on the separation of the oil from the emulsifiers by column chromatography. The emulsifiers are not eluted and the oil is determined gravimetrically after the solvent is evaporated. This method is also applicable to emulsifiable concentrates that do not contain solvents as co-formulants.

Gas-Liquid Chromatographic Determination of Sorbitol in Cooked Sausage Products

1978 ◽  
Vol 61 (1) ◽  
pp. 164-166
Author(s):  
Fred A Moseley ◽  
Joel S Salinsky ◽  
Robert W Woods
Keyword(s):  
Chromatographic Determination ◽  
Flame Ionization Detector ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Simple Method ◽  
Flame Ionization ◽  
Freeze Dried ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A rapid and simple method of analysis has been developed for sorbitol in cooked sausage products. Sorbitol is extracted from cooked sausage products with water, an aliquot of the extract is freeze-dried, and the trimethylsilyl (TMS) derivative of sorbitol is formed. An aliquot of the TMS-sorbitol is injected into a gas chromatograph and measured by a flame ionization detector. Analysis of fortified samples shows that the recovery compares well with known amounts of sorbitol added.

Gas-chromatographic determination of polyol profiles in cerebrospinal fluid.

1978 ◽  
Vol 24 (4) ◽  
pp. 545-548 ◽  
Author(s):  
S L Smith ◽  
M Novotny ◽  
E L Weber
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Cerebrospinal Fluid ◽  
Chromatographic Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Glass Capillary ◽  
Simple Method ◽  
Glass Capillary Columns ◽  
First Time

Abstract We describe a simple method for collectively determining polyols in the cerebrospinal fluid. The method consists of protein removal, sample derivatization, and gas chromatography of the trimethylsilylated polyols, with use of glass capillary columns. Nine major polyol constituents, the structures of which were verified by combined gas chromatography/mass spectrometry, can be simultaneously assayed. The presence of three polyols in the cerebrospinal fluid is reported here for the first time.

Normal-Phase Liquid Chromatographic Determination of Menadione in Animal Feeds

1988 ◽  
Vol 71 (4) ◽  
pp. 826-828 ◽  
Author(s):  
Roberto Laffi ◽  
Silvia Marchetti ◽  
Mario Marchetti
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Determination ◽  
Normal Phase ◽  
Vitamin K3 ◽  
Simple Method ◽  
Working Standard ◽  
Liquid Chromatographic Determination ◽  
Phase Liquid ◽  
Liquid Chromatographic

Abstract A simple method is presented for determination of menadione in vitamin premixes and feedstuffs by normal-phase liquid chromatography (LC). Vitamin K3 is extracted and converted to free menadione, which can be determined directly by LC analysis. Peak area or height is measured at 251 nm, and menadione is quantitated by comparison with the working standard. Menadione can be estimated with a detection limit of 2.5 ppm. Recoveries for premixes ranged from 97.3 to 98.3% and for feedstuffs from 93.7 to 96.8%. The method allows the assay of all commercial K3 compounds in pure or stabilized form and is applicable to a wide variety of feeds and premixes.

Chloramphenicol Extraction from Milk by Using the Diphasic Dialysis Method Followed by Liquid Chromatographic Determination

1994 ◽  
Vol 77 (4) ◽  
pp. 854-856 ◽  
Author(s):  
Javier Bayo ◽  
Miguel A Moreno ◽  
Javier Prieta ◽  
Susana Díaz ◽  
Guillermo Suárez ◽  
...  
Keyword(s):  
Working Conditions ◽  
Chromatographic Determination ◽  
Reversed Phase ◽  
Reversed Phase Liquid Chromatography ◽  
Simple Method ◽  
Dialysis Method ◽  
Liquid Chromatographic Determination ◽  
Phase Liquid ◽  
Liquid Chromatographic

Abstract An economical, fast, and simple method for the extraction and liquid chromatographic determination of chloramphenicol (CAP) in milk is described. CAP is extracted by using a recently developed membrane-based method named “diphasic dialysis.” CAP is detected and quantitated in the organic solvent used in dialysis without additional cleanup steps by reversed-phase liquid chromatography and UV detection (270 nm). The determination imit of CAP in milk was about 5 μg/L, although as little as 1 μg/L could be detected under optimal working conditions.

scholarly journals High-performance liquid chromatography for determination of α-tocopherol in vegetables

2013 ◽  
Vol 42 (1-2) ◽  
pp. 197-205 ◽  
Author(s):  
Marcin Horbowicz
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Chromatographic Determination ◽  
Uv Detector ◽  
Elution Time ◽  
Simple Method ◽  
Silica Column ◽  
Minimum Detectable Amount

A simple method for the determination of α-tocopherol in vegetables is described. The procedure consists of the following steps: saponification, extraction, silica-column clean-up, and high-performance liquid chromatography. Elution time for D, L-α-tocopherol was 9.0 min using a Zorbax Sil (250 x 4.6 mm) column and an isocratic mobile phase of hexane-methanol (99.3 + 0.7), with a flow rate of 1 ml/min, and detection at 292 nm using a variable UV detector. The average recovery of α-tocopherol was 91.2%, and the minimum detectable amount was 0.1 mg/100 g of fresh vegetable tissue. This method is comparable to gas-chromatographic determination of α-tocopherol, but has fewer analytical steps and gives more reproducible results.

Reverse Phase High Pressure Liquid Chromatographic Determination of Arprinocid in Animal Feeds

1982 ◽  
Vol 65 (1) ◽  
pp. 43-47
Author(s):  
Virginia A Thorpe
Keyword(s):  
High Pressure ◽  
Chromatographic Determination ◽  
Peak Height ◽  
Reverse Phase ◽  
High Pressure Liquid Chromatographic ◽  
Simple Method ◽  
Working Standard ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A simple method is presented for determination of arprinocid in finished feeds by reverse phase high pressure liquid chromatography. The sample is extracted with 95% DMF, the major feed interferences are removed by alumina chromatography, and arprinocid is separated from the remaining interferences on the HPLC column. The peak height detected at 254 nm can be quantitated by direct comparison with the working standard.

Simple method for gas chromatographic determination of ethylene emitted from plant tissues

1974 ◽  
Vol 46 (11) ◽  
pp. 1621-1622 ◽  
Author(s):  
K. A. Ramsteiner ◽  
B. A. Karlhuber ◽  
W. D. Hoermann
Keyword(s):  
Chromatographic Determination ◽  
Plant Tissues ◽  
Simple Method
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