Rapid Gas-Liquid Chromatographic Method for Determining Residues of Ethephon (2-Chloroethyl Phosphonic Acid) in Tomatoes

1976 ◽  
Vol 59 (5) ◽  
pp. 1185-1187
Author(s):  
George F Ernst ◽  
Marcia J P T Anderegg
Keyword(s):  
Liquid Chromatography ◽  
Ethyl Acetate ◽  
Phosphonic Acid ◽  
Growth Regulator ◽  
Chromatographic Method ◽  
Gas Liquid Chromatography ◽  
Flame Photometric Detector ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract A rapid method is described for the determination of the growth regulator ethephon (2-chloroethyl phosphonic acid) in tomatoes. Samples are extracted with ethyl acetate. The extract is methylated, decolorized with carbon, and analyzed by gas-liquid chromatography on a column packed with 15% QF-1/10% DC-200 on Chromosorb W (HP). A flame photometric detector is used. Recoveries from tomatoes fortified with 0.1–11.0 ppm ethephon were 78—98%. The sensitivity of this method is about 0.1 ppm.

High-Pressure Liquid Chromatographic Method for the Determination of Patulin in Apple Butter

1975 ◽  
Vol 58 (4) ◽  
pp. 754-756 ◽  
Author(s):  
George M Ware
Keyword(s):  
High Pressure ◽  
Acetic Acid ◽  
Liquid Chromatography ◽  
Ethyl Acetate ◽  
Chromatographic Method ◽  
High Pressure Liquid Chromatographic ◽  
Ultraviolet Detector ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract Patulin is extracted from apple butter samples with ethyl acetate and the extract is cleaned up on a silica gel column, using benzene-ethyl acetate (75+25) as the eluant. High-pressure liquid chromatography, using a 25 cm Zorbax-Sil column, isooctane-ethyl ether-acetic acid (750+250+0.5) as the mobile solvent, and a 254 nm ultraviolet detector, is used for the determinative step. Under these conditions, patulin is eluted before 5-hydroxymethylfurfural, a component of apple butter which interferes with other liquid chromatographic and thin layer chromatographic methods. Recoveries of patulin added at levels of 34.6, 138.4, and 276.8 μg/kg ranged from 89.0 to 112.1%.

scholarly journals Comparative Study of the Anthranilic Acid Esters by Ultraviolet Spectrophotometry, Colorimetry, Gravimetry, and Gas-Liquid Chromatography

1965 ◽  
Vol 48 (2) ◽  
pp. 341-343
Author(s):  
Richard L Brunelle ◽  
Glenn E Martin ◽  
V G Ohanesian
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Method ◽  
Steam Distillation ◽  
Gas Liquid Chromatography ◽  
Ultraviolet Spectrophotometry ◽  
Characteristic Peak ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic ◽  
Acid Esters

Abstract A rapid and specific gas-liquid chromatographic method has been developed for the separation and quantitative determination of methyl and ethyl anthranilate in grape extracts and imitation grape flavors in the presence of interfering substances. Total methyl and ethyl anthranilate can be quantitatively determined in imitation grape flavors by ultraviolet spectrophotometry after steam distillation of the sample. Methyl and ethyl anthranilate show a characteristic peak at 335 mμ. Results for methyl and ethyl anthranilate by gas-liquid chromatography and ultraviolet spectrophotometry are compared with those obtained by the official AOAC methods.

Collaborative Study of Gas-Liquid Chromatographic Method for Analysis of Microencapsulated Methyl Parathion Insecticide

1977 ◽  
Vol 60 (4) ◽  
pp. 862-864
Author(s):  
James J Karr
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Method ◽  
Methyl Parathion ◽  
Collaborative Study ◽  
Gas Liquid Chromatography ◽  
Flame Ionization ◽  
Extraction Step ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract Eleven laboratories collaboratively studied the assay of methyl parathion in 2 formulations of Penncap-M insecticide. The procedure includes a grinding and extraction step, followed by the determination of methyl parathion by flame ionization gas-liquid chromatography. At the 15% level, the variance within laboratories was 0.0905, and among laboratories, 0.0755. At the 20% level, the figures were 0.0556 and 0.0205, respectively. The method has been adopted as official first action.

Determination of Cymiazole Residues in Honey by Liquid Chromatography

1993 ◽  
Vol 76 (1) ◽  
pp. 92-94 ◽  
Author(s):  
Paolo Cabras ◽  
Marinella Melis ◽  
Lorenzo Spanedda
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Analysis ◽  
Mobile Phase ◽  
Chromatographic Method ◽  
Reversed Phase ◽  
Limit Of Determination ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic ◽  
Control Samples

Abstract A liquid chromatographic method is described for the determination of cymiazole residues in honey. This acaricide is determined on a reversed-phase (C18) column, with a CH3CN-O.OOIN HCI-NaCI mixture (950 mL + 50 mL + 0.3 g/L) as the mobile phase, and UV detection at 265 nm. Cymiazole is extracted with n-hexane from aqueous alkalinized (pH 9) honey solutions. No further cleanup of the honey extract was required before chromatographic analysis. Recoveries on control samples fortified with 0.01,0.10, and 1.00 ppm cymiazole ranged from 92 to 102%. The limit of determination was 0.01 ppm.

Quantitative Determination of L-Ascorbic Acid by Gas-Liquid Chromatography

1974 ◽  
Vol 57 (6) ◽  
pp. 1346-1348
Author(s):  
Janis E Schlack
Keyword(s):  
Ascorbic Acid ◽  
Lead Acetate ◽  
Chromatographic Method ◽  
Ethanol Solution ◽  
Lead Salt ◽  
Gas Liquid Chromatography ◽  
Trimethylsilyl Derivative ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract A gas-liquid chromatographic method for L-ascorbic acid in foods and food products has been devised. Ascorbic acid is extracted into an ethanol solution, precipitated with lead acetate, regenerated from the lead salt as its trimethylsilyl derivative, and chromatographed on an SE- 30 column. Recoveries averaged 100.1%; the standard deviation was ±0.23%.

Fast Cleanup of Difficult Substrates for Determination of Fenitrothion and Some Derivatives

1981 ◽  
Vol 64 (6) ◽  
pp. 1470-1473
Author(s):  
Patrick Haché ◽  
René Marquette ◽  
Gilles Volpé ◽  
Victorin N Mallet
Keyword(s):  
Liquid Chromatography ◽  
Ethyl Acetate ◽  
Parent Compound ◽  
Chicken Liver ◽  
Gas Liquid Chromatography ◽  
Fast Recovery ◽  
Simple Method ◽  
Flame Photometric Detector ◽  
Derivatives Of

Abstract A simple method is described for the fast recovery of fenitrothion, an organophosphorus insecticide, from soil, chicken liver, urine, clams, and pine needles. The substrate is homogenized with acetonitrile or methanol, diluted with water, and passed through a column containing Amberlite XAD-7. Fenitrothion is recovered quantitatively by eluting with 4 portions of 25 mL ethyl acetate. After evaporation, the compound is determined quantitatively by gas-liquid chromatography with a flame photometric detector. The procedure is also suitable for some derivatives of fenitrothion, namely, fenitrooxon and S-methylfenitrothion. As low as 0.05 ppm of the parent compound may be determined.

Determination of Cinnamyl Anthranilate in Perfume, Cologne, and Toilet Water by Liquid Chromatography with Fluorescence Detection

1987 ◽  
Vol 70 (6) ◽  
pp. 958-960
Author(s):  
Francois X Demers ◽  
Ronald L Yates ◽  
Henry M Davis
Keyword(s):  
Liquid Chromatography ◽  
Standard Deviation ◽  
Fluorescence Detection ◽  
Chromatographic Method ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract A liquid chromatographic method with fluorescence detection was developed for the determination of cinnamyl anthranilate in perfumes and other fragrance compositions. The method was evaluated by conducting recovery studies of 10 different commercial fragrance compositions to which cinnamyl anthranilate had been added at levels of 0.1, 0.5, and 1.0 mg/mL. Recoveries ranged from 91 to 103% with a mean of 97% and a standard deviation of ±3.3%.

Evaluation and Confirmation of an Alkylation-Gas-Liquid Chromatographic Method for the Determination of Carbamate and Urea Herbicides in Foods

1976 ◽  
Vol 59 (5) ◽  
pp. 1061-1065
Author(s):  
James F Lawrence
Keyword(s):  
Sodium Methoxide ◽  
Chromatographic Method ◽  
Parent Compound ◽  
Sodium Hydride ◽  
Food Type ◽  
Gas Liquid Chromatography ◽  
Liquid Chromatographic Method ◽  
Herbicide Concentration ◽  
Liquid Chromatographic

Abstract An alkylation technique using methyl iodide and sodium hydride in dimethyl sulfoxide has been evaluated for 3 carbamate and 7 urea herbicides in 9 foods. Recoveries ranged from 56 to 113%, depending on herbicide, concentration, and food type. Reproducibility was about ±6% at 0.1 and 1.0 ppm. Identities of the herbicides were confirmed at these and lower levels by cleaving the aniline moiety from the alkylated herbicides with sodium methoxide in methanol, followed by gas-liquid chromatography on the same column as the parent compound. An electrolytic conductivity detector in the nitrogen mode was used for all analyses. Minimum detectable levels were in the range of 0.005–0.01 ppm in the foods studied.

Liquid Chromatographic Method for Determination of Cyfluthrin in Technical and Formulated Products

1990 ◽  
Vol 73 (4) ◽  
pp. 595-598
Author(s):  
Stephen C Slahck
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Method ◽  
Internal Standard ◽  
Normal Phase ◽  
Liquid Chromatographic Method ◽  
Phase Liquid ◽  
Liquid Chromatographic

Abstract A liquid chromatographic method for determination of cyfluthrin (Baythrold®, Tempo®) diastereomers In technical and formulated products has been developed. Samples are dissolved in dloxane-hexane and analyzed by normal-phase liquid chromatography using acetophenone as an internal standard. The method Is applicable to technical Baythrold, Baythrold 2 EC, Tempo 20 WP, and granular formulations. The method separates all 4 diastereomers of cyfluthrin and all impurities in less than 19 mln.

A 57Co-soap assay for plasma total non-esterified fatty acids compared with a gas-liquid chromatographic method.

1980 ◽  
Vol 26 (13) ◽  
pp. 1879-1882 ◽  
Author(s):  
D C Turnell ◽  
C P Price ◽  
M M France
Keyword(s):  
Fatty Acids ◽  
Liquid Chromatography ◽  
Chromatographic Method ◽  
Gas Liquid Chromatography ◽  
Esterified Fatty Acids ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract We describe a relatively rapid radiochemical assay for determining plasma non-esterified fatty acids, by use of a Dole-type (J. Clin. Invest. 35: 150, 1956) extraction and formation of 57Co soaps. Results correlated well (r = 0.957) with those by gas-liquid chromatography. The between-batch CV for 1.12 mmol of non-esterified fatty acids per liter was 7%; the sensitivity is estimated to be 22 mumol/L.

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