STUDIES ON THE DISSIPATION OF DIFLUBENZURON AND METHOPRENE FROM SHALLOW PRAIRIE POOLS

1980 ◽  
Vol 112 (2) ◽  
pp. 173-177 ◽  
Author(s):  
D. J. Madder ◽  
W. L. Lockhart
Keyword(s):  
Biological Activity ◽  
Liquid Chromatography ◽  
Growth Regulator ◽  
Mosquito Control ◽  
Parent Compound ◽  
Gas Liquid Chromatography ◽  
Mosquito Larvae ◽  
Canadian Prairie ◽  
Repeated Applications

AbstractA series of sod-lined pools were constructed and used to monitor repeated applications of diflubenzuron as Dimilin WP-25 and mefhoprene as Altosid SR-10. Diflubenzuron and methoprene "disappeared" rapidly from the pool water as determined by bioassays using Aedes aegypti (L.) (Culicidae) larvae and by gas-liquid chromatography (GLC). Chemical assays for a diflubenzuron derivative were positive for several days; bioassay indicated the presence of diflubenzuron (or at least growth regulator activity) at levels toxic to mosquito larvae for up to 16 days. In contrast methoprene "fell" below GLC detection within 2 days although biological activity persisted for approximately a week after treatment. Neither parent compound should cause a long-term persistence hazard when used for mosquito control in Canadian prairie waters.

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.

Biosynthesis of Gibberellins in Barley and Dwarf Rice Seedlings

1974 ◽  
Vol 1 (2) ◽  
pp. 199 ◽  
Author(s):  
KF Faull ◽  
BG Coombe ◽  
LG Paleg
Keyword(s):  
Biological Activity ◽  
Liquid Chromatography ◽  
Retention Time ◽  
De Novo ◽  
Mevalonic Acid ◽  
Biologically Active ◽  
Gas Liquid Chromatography ◽  
Rice Seedlings ◽  
Kaurenoic Acid ◽  
Gibberellin A1

Incorporation studies with 14 CO2 suggested that 11-day-old barley seedlings biosynthesized an A1- like gibberellin de novo and that the biosynthesized gibberellin completely turned over within 12 h. Exogenous [14C]mevalonic acid, supplied in a variety of ways, was not incorporated into the gibberellins of barley seedlings. Barley seedlings, which failed to elongate in response to exogenous ent-kaurenoic acid, metabolized exogenous [17-14C]ent-kaurenoic acid to a few compounds, but not to a biologically active gibberellin. Dwarf rice seedlings (cv. Tan-ginbozu), which elongated in response to exogenous ent-kaurenoic acid, metabolized exogenous [17-14C]ent-kaurenoic acid to a number of radioactive compounds, one of which behaved like [14C]gibberellin A1 in that it showed radioactivity and biological activity at the expected retention time during gas-liquid chromatography.

Hexachlorobenzene Residues in Spanish Meat Products After Cooking, Curing, and Long-term Ripening

1992 ◽  
Vol 55 (11) ◽  
pp. 920-923 ◽  
Author(s):  
AGUSTIN A. ARIÑO ◽  
ANTONIO HERRERA ◽  
MARIA P. CONCHELLO ◽  
CONSUELO PÉREZ
Keyword(s):  
Liquid Chromatography ◽  
Electron Capture ◽  
Meat Products ◽  
Packed Columns ◽  
Electron Capture Detector ◽  
Gas Liquid Chromatography ◽  
Curing Process ◽  
Pork Meat ◽  
Pork Sausage

The effect of cooking, curing, and long-term ripening on hexachlorobenzene (HCB) residues in Spanish pork meat products was investigated. Twenty pork bologna samples were analyzed before and before cooking at 80–82°C for 100 min. Twenty-six fermented dry-cured pork sausage samples were initially analyzed just before filling into natural casing and at 4-, 15-, and 30-d intervals during curing process. Thirty dry-salted cured ham samples were investigated fresh, after dry-salting for 10 d, and after 6 month ripening. HCB residues were quantitated by gas-liquid chromatography with electron capture detector using packed columns. Neither cooking nor curing significantly reduced the HCB content in pork bologna and pork sausage, respectively. Ham processing yielded a significant (p<0.001) reduction of 42% in HCB levels throughout the length of maturation.

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.

Determination of Altosid Insect Growth Regulator in Waters, Soils, Plants, and Animals by Gas-Liquid Chromatography

1975 ◽  
Vol 58 (1) ◽  
pp. 10-18
Author(s):  
Wayne W Miller ◽  
James S Wilkins ◽  
Loren L Dunham
Keyword(s):  
Liquid Chromatography ◽  
Growth Regulator ◽  
High Speed ◽  
Insect Growth Regulator ◽  
Gas Liquid Chromatography ◽  
Mass Fragmentography ◽  
Neutral Alumina ◽  
Insect Growth ◽  
Extraction Solvent ◽  
Hydrogen Flame

Abstract Residues of isopropyl (2E,4E)-ll-methoxy-3, 7,1 l-trimethyl-2,4-dodecadienoate (Altosid®) insect growth regulator are determined in waters, soils, plants, milk, eggs, fish, shellfish, poultry and cattle tissues, blood, urine, and feces. Acetonitrile is the primary extraction solvent for all samples. Residues are extracted by high-speed blending followed by vacuum filtration. Fatty extracts are subjected to cold-temperature precipitation and filtration. Samples are cleaned up by petroleum ether partitioning and Florisil and neutral alumina chromatography. The concentrated eluants are analyzed by gas-liquid chromatography (GLC) on columns of differing polarity, using hydrogen flame ionization detectors. The identity of suspected residues is confirmed by additional GLC and by mass fragmentography. The lower limits of detection were: water samples, 0.0004–0.001 ppm; soils, blood, and urine, 0.001 ppm; forage grasses, forage legumes, and rice foliage, 0.005 ppm; and milk, eggs, fish, shellfish, poultry and cattle tissues, and feces, 0.010 ppm.

scholarly journals Primary seed production of drug-free varieties of cannabis in the Middle Volga region

2021 ◽  
pp. 4-8
Author(s):  
Irina Vladimirovna Bakulova
Keyword(s):  
Experimental Data ◽  
Liquid Chromatography ◽  
Seed Production ◽  
Gas Liquid Chromatography ◽  
Middle Volga Region ◽  
Economically Valuable Traits ◽  
Middle Volga ◽  
High Level ◽  
Drug Free

The article discusses the practical aspects of seed production of monoecious Ko noble planting. It is shown that the production of varietal seeds, maintenance of economically valuable traits, properties and preservation of biological purity of hemp varieties at a high level is possible only with a well-established seed production system. Long-term experimental data on the assessment of plants from 1-year breeding nurseries for the content of tetrahydrocannabinol (THC) by gas-liquid chromatography (GC) are presented. Techniques that ensure the formation of high varietal and sowing qualities as well as yield properties of seed material are considered.

A study of asphalt-aggregate interactions using inverse gas-liquid chromatography

1974 ◽  
Vol 24 (11) ◽  
pp. 645-654 ◽  
Author(s):  
F. Alan Barbour ◽  
Richard V. Barbour ◽  
J. Claine Peterson
Keyword(s):  
Liquid Chromatography ◽  
Gas Liquid Chromatography

GASCHROMATOGRAPHIC DETERMINATION OF STEROIDS IN THE URINE OF PATIENTS WITH CUSHING'S SYNDROME

1971 ◽  
Vol 67 (2) ◽  
pp. 303-315 ◽  
Author(s):  
A. J. Moolenaar ◽  
A. P. van Seters
Keyword(s):  
Liquid Chromatography ◽  
Cushing’S Syndrome ◽  
Normal Subjects ◽  
Diagnostic Value ◽  
Cushing's Syndrome ◽  
Gas Liquid Chromatography ◽  
Obese Subjects

ABSTRACT The 17-oxosteroids were estimated in the urine of 27 patients with Cushing's syndrome by gas-liquid chromatography (G. L. C.). The values of the various steroid fractions are compared with those of normal subjects, patients with thyrotoxicosis and obese subjects. The effect of the age of the patients on the diagnostic value of the invidual 17-oxosteroids and their ratios is discussed.

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