scholarly journals Liquid ChromatographicDiode-Array Detection Multiresidue Determination of Rice Herbicides in Drinking and Paddy-Field Water

2009 ◽  
Vol 92 (4) ◽  
pp. 1190-1195 ◽  
Author(s):  
Rafael Roehrs ◽  
Renato Zanella ◽  
Ionara Pizzuti ◽  
Martha B Adaime ◽  
Luca Pareja ◽  
...  
Keyword(s):  
Paddy Field ◽  
Solid Phase ◽  
Diode Array ◽  
Diode Array Detection ◽  
Lower Detection Limit ◽  
Lower Detection ◽  
Array Detection ◽  
Multiresidue Determination ◽  
Postemergence Herbicides

Abstract A sensitive, rapid, and simple multiresidue method for the simultaneous determination of six postemergence herbicides currently used in rice cultivationmetsulfuron methyl, bensulfuron methyl, pyrazosulfuron ethyl, bentazone, bispyribac sodium, and cyhalofop butylin drinking and paddy-field water is presented. Water samples were extracted with solid-phase extraction cartridges. Final determination was made by LC with diode-array detection. The extraction efficiencies of C18 and HLB cartridges were compared. The average recovery obtained for these compounds for the lowest spiked level (0.1 g/L) varied from 70 to 122 for C18 and 75119 for HLB, with RSDs of 11 and 8.3, respectively. The method had good linearity, and the lower detection limit for the pesticides studied varied from 0.03 to 0.04 g/L. The proposed method was also tested in paddy-field water, with recovery studies giving good results with low RSDs at 1.0 g/L.

scholarly journals Determination of Isoflavones in Soybean Flour by Matrix Solid-Phase Dispersion Extraction and Liquid Chromatography with UV-Diode Array Detection

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Antonella Aresta ◽  
Pietro Cotugno ◽  
Federica Massari ◽  
Carlo Zambonin
Keyword(s):  
Liquid Chromatography ◽  
Solid Phase ◽  
Extraction Yield ◽  
Diode Array ◽  
Diode Array Detection ◽  
Soybean Flour ◽  
Matrix Solid Phase Dispersion ◽  
Phase Dispersion ◽  
Array Detection

A new analytical method, based on liquid chromatography (LC) with UV-diode array detection, for the simultaneous determination of daidzein, genistein, and glycitein and their 7-O-β-D-glucopyranoside (daidzin, genistin, and glycitin, resp.) has been successfully developed. All the calibration curves showed good linearity within the concentration range 0.02–2 μg/ml. The limits of detection and quantitation were 0.057 (genistin and glycitein), 0.124 μg/ml (genistein), 0.190 μg/ml (genistin and glycitein), and 0.410 μg/ml (genistein), respectively. Within-day and between-days precision were found not to be significantly different according to an F-test; values (% RSD) ranged from 2.0 to 2.9%. Extraction and clean-up of soybean flour samples were carried out using matrix solid-phase dispersion extraction (MSPD). The main parameters affecting extraction yield, such as dispersant, type and amount of additives, cosorbent, and extractive solvent, were evaluated and optimized. The average recovery values were between 85.7 and 102.6%. The target isoflavone concentration levels estimated in this work fit existing literature data and were comprised between 39.3 and 345.3 μg/g. The whole procedure has proved to be simple, accurate, precise, and cheap.

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