scholarly journals Use of an Oxidation Reaction for the Quantitative Determination of Albendazole with Chloramine-T and Acid Dyes

2003 ◽  
Vol 19 (5) ◽  
pp. 779-784 ◽  
Author(s):  
Kanakapura BASAVAIAH ◽  
Hulikal Chandrashekar PRAMEELA
Keyword(s):  
Quantitative Determination ◽  
Oxidation Reaction ◽  
Acid Dyes ◽  
Chloramine T

scholarly journals Quantitative Determination of Paralytic Shellfish Poisoning Toxins in Shellfish by Using Prechromatographic Oxidation and Liquid Chromatography with Fluorescence Detection

2001 ◽  
Vol 84 (4) ◽  
pp. 1099-1108 ◽  
Author(s):  
James F Lawrence ◽  
Barbara Niedzwiadek
Keyword(s):  
Quantitative Determination ◽  
Oxidation Reaction ◽  
Solid Phase ◽  
Paralytic Shellfish Poisoning ◽  
Phase Extraction ◽  
Shellfish Poisoning ◽  
Paralytic Shellfish ◽  
Cleanup Procedure ◽  
Psp Toxins

Abstract The prechromatographic oxidation LC method developed by Lawrence [J. Assoc. Off. Anal. Chem. 74, 404–409(1991)] for the determination of paralytic shellfish poisoning (PSP) toxins has been tested for the quantitative determination of PSP toxins in shellfish. All aspects of the method were studied and modified as necessary to improve its performance for routine regulatory purposes. The chromatographic conditions were changed to shorten analysis time. The oxidation reaction was tested for repeatability and the influence of the s ample matrix on quantitation. An important part of the study was to quantitatively evaluate an ion exchange (-COOH) cleanup step using disposable solid-phase extraction cartridges that separated the PSP toxins into 3 distinct groups for quantitation, namely the C toxins, the GTX toxins, and the saxitoxin group. The cleanup step was very simple and used increasing concentrations of aqueous NaCl for elution of the toxins. The C toxins were not retained by the cartridges and thus were eluted unretained with water. The GTX toxins (GTX1 to GTX6 as well as dcGTX2 and dcGTX3) eluted from the cartridges with 0.05M NaCl while the saxitoxin group (saxitoxin, neosaxitoxin, and dcsaxitoxin) required 0.3M NaCl for elution. Each fraction was analyzed by LC after oxidation with periodate or peroxide. All of the compounds could be separated and quantitatively determined in spiked samples of mussels, clams, and oysters. The nonhydroxylated toxins could be quantitated at concentrations as low as about 0.02 μg/g (2 μg/100 g) of tissue while the hydroxylated toxins could be quantitated at concentrations as low as about 0.1 μg/g (10 μg/100 g). Average recoveries of the toxins through the complete cleanup procedure were 85%or greater for spiked extracts of oysters and clams and greater than 73%for mussels.

Spectrodensitometric Determination of Chloramine-T in Ice Cream

1978 ◽  
Vol 61 (6) ◽  
pp. 1415-1418
Author(s):  
Paul R Beljaars ◽  
Theo M M Rondags
Keyword(s):  
Detection Limit ◽  
Thin Layer ◽  
Quantitative Determination ◽  
Chromatographic Separation ◽  
Ice Cream ◽  
Average Recovery ◽  
Scanning Procedure ◽  
Chloramine T ◽  
Whipped Cream

Abstract A spectrodensitometric method has been developed for the quantitative determination of chloramine-T (N-chloro-Ar-sodium-p-toluenesulfonamide) in ice cream. Chloramine-T is extracted and converted into p-toluenesulfonamide (p-TSA) followed by thin layer chromatographic separation of concentrated extracts on silica gel and quantitation of the p-TSA spots from standards and samples by direct scanning with a reflectance densitometer at 228 nm. A linear relationship was obtained between recorded peak area and concentration for 0.5–7.0 μg p-TSA/spot. The reproducibility of the complete method was 2.87% (n = 9 determinations). The detection limit of the scanning procedure was 0.5 μg p-TSA/spot, corresponding to a concentration of 4 mg chloramine-T/kg sample. The average recovery was 88±3% (P = 95%) for 10 ice cream samples spiked with chloramine-T at levels ranging from 10 to 55 mg/kg. The described method was used to assay 146 commercial ice cream and whipped cream samples for chloramine-T.

Quantitative determination of octestrol by a model chain oxidation reaction

1981 ◽  
Vol 15 (12) ◽  
pp. 904-907
Author(s):  
A. U. Tulegenova ◽  
L. I. Brutko ◽  
V. F. Tsepalov ◽  
G. P. Gladyshev
Keyword(s):  
Quantitative Determination ◽  
Oxidation Reaction ◽  
Chain Oxidation ◽  
Model Chain

Quantitative determination of longitudinal and transverse cross-relaxation rates

1999 ◽  
Vol 96 (9/10) ◽  
pp. 1608-1615
Author(s):  
T. E. Malliavin ◽  
H. Desvaux ◽  
M. A. Delsuc
Keyword(s):  
Quantitative Determination ◽  
Cross Relaxation ◽  
Relaxation Rates

Quantitative Determination of Gallic acid and Cyanidin-3-O-Glucoside within Sumac Extracts by HPLC-MS/MS

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
M Koşar ◽  
F Göger ◽  
N Kırımer ◽  
KHC Başer
Keyword(s):  
Quantitative Determination ◽  
Gallic Acid
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