Worker environment research. III. A rapid method for the semi-quantitative determination of some dislodgable pesticide residues on citrus foliage

1976 ◽  
Vol 15 (3) ◽  
pp. 305-310 ◽  
Author(s):  
Charles A. Smith ◽  
Francis A. Gunther ◽  
James D. Adams
Keyword(s):  
Quantitative Determination ◽  
Rapid Method ◽  
Pesticide Residues ◽  
Environment Research

Rapid Method for Quantitative Determination of Propoxyphene in Serum by Gas-Liquid Chromatography

1973 ◽  
Vol 19 (5) ◽  
pp. 492-495 ◽  
Author(s):  
M A Evenson ◽  
Susan Koellner
Keyword(s):  
Liquid Chromatography ◽  
Quantitative Determination ◽  
Rapid Method ◽  
Coefficient Of Variation ◽  
Therapeutic Dose ◽  
Gas Liquid Chromatography ◽  
Healthy Controls ◽  
Serum Pool ◽  
Sedative Drugs

Abstract Rapid, accurate, and precise gas-chromatographic methods are reported for measurement of propoxyphene ("Darvon") in serum. A sample of 5 ml of serum is required for quantitation in blood after a therapeutic dose of 130-195 mg of propoxyphene; in cases of overdose of propoxyphene, only 1 ml of serum is required in a "toxic method" variation. Neither serum from healthy controls or from hospitalized patients contains interfering substances. Several commonly used analgesic and sedative drugs, added to a serum pool, also did not interfere. Day-to-day precision of the therapeutic method, as measured by the coefficient of variation (CV), is 7%; the CV for the method as applied to overdose cases is less than 3%. Propoxyphene added to serum could be about 86% accounted for analytically.

Quantitative Determination of Sorbitol in Raisins and Dietetic Foods by Gas-Liquid Partition Chromatography

1973 ◽  
Vol 56 (5) ◽  
pp. 1267-1269
Author(s):  
Enrique Fernandez-Flores ◽  
Victor H Blomquist
Keyword(s):  
Organic Acids ◽  
Quantitative Determination ◽  
Rapid Method ◽  
Internal Standard ◽  
Trimethylsilyl Derivative ◽  
Partition Chromatography ◽  
Lead Salts

Abstract A rapid method for the determination of sorbitol in raisins and dietetic foods is described. Sorbitol is converted to a trimethylsilyl derivative after precipitation of interfering organic acids as lead salts and determined by GLC, using α-d-glucoheptose as an internal standard. Nine samples of dietetic foods were analyzed. The results compared satisfactorily with the declared sorbitol content for each product. The recovery of 0.5% sorbitol added to raisins was 93%.

scholarly journals Spectrophotometric Determination of Ritodrine and Isoxsuprine Hydrochlorides Using 4-Aminoantipyrine

2000 ◽  
Vol 83 (6) ◽  
pp. 1440-1445 ◽  
Author(s):  
Hosakere D Revanasiddappa ◽  
Bochhe Gowda Manju
Keyword(s):  
Quantitative Determination ◽  
Rapid Method ◽  
Spectrophotometric Determination ◽  
Dosage Forms ◽  
Oxidizing Agent ◽  
Ritodrine Hydrochloride ◽  
Colored Product

Abstract A simple, accurate, and rapid method for the quantitative determination of ritodrine hydrochloride (RTH) and isoxsuprine hydrochloride (ISH) in both pure and dosage forms, is described. The method is based on the development of pink colored product as a result of the condensation of 4-aminoantipyrine with phenols in the presence of an alkaline oxidizing agent. The resulting products are measured at 510 nm for both drugs, with molar absorptivities of 0.98 × 104 and 1.20 × 104 L/mol·cm for RTH and ISH, respectively. A study of the effect of commonly associated excipients revealed that they did not cause interference.

Formation of Pentafluorobenzyl Derivatives for the Identification and Quantitation of Acid and Phenol Pesticide Residues

1973 ◽  
Vol 56 (6) ◽  
pp. 1503-1505 ◽  
Author(s):  
Lauren G Johnson
Keyword(s):  
Quantitative Determination ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Cleanup Procedure ◽  
Derivatives Of

Abstract A procedure is described for the preparation and electron capture GLC determination of pentafluorobenzyl ester and ether derivatives of 2,4-D, p,p′-DDA, 1-naphthol, p-nitrophenol, and sec.-amyl phenols. A column cleanup procedure quantitatively isolates the derivatives from excess reagents and other interferences. The method can be used as an aid in the confirmation of the identity of pesticide residues and for the quantitative determination of extracted residues.

Quantitative Determination of Tryptophan Metabolites (via Kynurenine) in Biologic Fluids

1959 ◽  
Vol 5 (5) ◽  
pp. 391-401 ◽  
Author(s):  
D Coppini ◽  
C A Benassi ◽  
M Montorsi
Keyword(s):  
Quantitative Determination ◽  
Rapid Method ◽  
Methyl Ether ◽  
Anthranilic Acid ◽  
Kynurenic Acid ◽  
Large Range ◽  
Xanthurenic Acid ◽  
Two Dimensional ◽  
Tryptophan Metabolites

Abstract A simple and rapid method for the quantitative determination of eight tryptophan (via kynurenine) metabolites is described. The following compounds can be determined even when present in the same sample of urine, blood or spinal fluid: kynurenine, 3-hydroxykynurenine, Nα-acetylkynurenine, anthranilic and 3-hydroxyanthranilic acids, kynurenic and xanthurenic acids, 8-methyl ether of the xanthurenic acid. The compounds are separated by means of two-dimensional chromatography. Spots of kynurenic acid, Nα-acetylkynurenine and xanthurenic acid 8-methyl ether are eluted with ethanol and the absorbancies are read in the ultraviolet. An acetic solution of p-dimethylaminobenzaldehyde serves as eluent and chromogenic reagent for the spots of kynurenine and anthranilic acid. Spots corresponding to 3-hydroxykynurenine, xanthurenic and 3-hydroxyanthranilic acids are eluted with water and determined by means of the color developed with a diazo reagent. Kynurenic and xanthurenic acids can also be determined conveniently by means of a spectrophotofluorometric procedure. The reproducibility of the results is satisfactory over a large range, and very good for amounts of 1 to 5 µg.

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