HPLC DETERMINATION OF LINURON RESIDUES IN ASPARAGUS FOLLOWING PRE- AND EARLY POSTEMERGENCE APPLICATIONS

1990 ◽  
Vol 70 (2) ◽  
pp. 591-597 ◽  
Author(s):  
ALLAN J. CESSNA
Keyword(s):  
British Columbia ◽  
Residue Analysis ◽  
Hplc Determination

In a 2-yr study, residues of the herbicide linuron were determined by HPLC in asparagus which had been treated at two sites in British Columbia with both post- and preemergence applications at 1.1 and 2.2 kg ha−1. Maximum linuron residues detected in preemergence samples were in the order of 10 μg kg−1, whereas maximum residues in the postemergence samples were greater than 400 μg kg−1. Recoveries of linuron from fortified asparagus tissue were 92.2 ± 11.2% at the 10 μg kg−1 fortification level.Key words: Linuron, asparagus, preemergence application, residues, residue analysis

scholarly journals Current Strategies for Studying the Natural and Synthetic Bioactive Compounds in Food by Chromatographic Separation Techniques

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1100
Author(s):  
Wioletta Parys ◽  
Małgorzata Dołowy ◽  
Alina Pyka-Pająk
Keyword(s):  
Gas Chromatography ◽  
Bioactive Compounds ◽  
Residue Analysis ◽  
Food Products ◽  
Vital Role ◽  
Bioactive Molecules ◽  
Validation Parameters ◽  
Layer Chromatography ◽  
Natural And Synthetic

The present study summarizes the new strategies including advanced equipment and validation parameters of liquid and gas chromatography methods i.e., thin-layer chromatography (TLC), column liquid chromatography (CLC), and gas chromatography (GC) suitable for the identification and quantitative determination of different natural and synthetic bioactive compounds present in food and food products, which play an important role in human health, within the period of 2019–2021 (January). Full characteristic of some of these procedures with their validation parameters is discussed in this work. The present review confirms the vital role of HPLC methodology in combination with different detection modes i.e., HPLC-UV, HPLC-DAD, HPLC-MS, and HPLC-MS/MS for the determination of natural and synthetic bioactive molecules for different purposes i.e., to characterize the chemical composition of food as well as in the multi-residue analysis of pesticides, NSAIDs, antibiotics, steroids, and others in food and food products.

Gas Chromatographic Determination of Ametryn and Its Metabolites in Tropical Root Crops

1984 ◽  
Vol 67 (2) ◽  
pp. 280-284
Author(s):  
Promode C Bardalaye ◽  
Willis B Wheeler
Keyword(s):  
Anhydrous Sodium Sulfate ◽  
Residue Analysis ◽  
Gel Permeation Chromatography ◽  
Chromatographic Determination ◽  
Solvent System ◽  
Complete Separation ◽  
Flame Photometric Detector ◽  
Root Crops ◽  
Photometric Detector

Abstract Residue analysis of the herbicide ametryn (2-methyIthio-4-ethylamino-s-isopropylamino-s-triazine) is widely known but an analytical method for determining its metabolites has not yet been reported in the literature. A method has been developed for the extraction and determination of ametryn and 3 metabolites, 2-methylthio-4-amino-6-isopropylammo- s-triazine (GS-11354), 2-methylthio-4,6-diamino-.s-triazine(GS- 26831), and 2-methylthio-4-amino-6-ethylamino-s-triazine (GS-11355) in taniers, yams, cassava. Residues were extracted from crops with ethyl acetate-toluene (3 + 1 v/v), using a Polytron homogenizer and anhydrous sodium sulfate added for drying. The extracts were cleaned up by automated gel permeation chromatography on Bio-Beads SX-3 gel in the same solvent system. Quantitative determination was performed by gas chromatographic (GC) analysis on a column packed with 5% DEGS-PS on 100-120 mesh Supelcoport using either an N-P detector or a flame photometric detector (FPD) in the sulfur mode. Minimum detection by the flame photometric detector is 10 ng each for ametryn, GS-11354, and GS-11355 and 21 ng for GS-26831; by the N-P detector, 0.3 ng of each component gives easily quantitatable peaks. On a parts per million basis, starting with 25 g sample, the FPD detected a minimum level of 0.04 p.g/g each for ametryn, GS-11354, and GS-11355, and 0.08 p.g/g for GS-26831. The N-P detector could detect 0.0024 p.g/g for all 4 compounds. In addition to superior sensitivity, instrumental conditions allowed the complete separation of components in 10 min, for the N-P detector; more than 30 min was required for the FPD. Recoveries from fortified crops ranged from 67 to 111% at levels of 0.1-1.0 μg/g.

A new method for the HPLC determination of gamma-hydroxybutyric acid (GHB) following derivatization with a coumarin analogue and fluorescence detection

Talanta ◽  
2008 ◽  
Vol 75 (2) ◽  
pp. 356-361 ◽  
Author(s):  
Constantinos K. Zacharis ◽  
Nikolaos Raikos ◽  
Nikolaos Giouvalakis ◽  
Helen Tsoukali-Papadopoulou ◽  
Georgios A. Theodoridis
Keyword(s):  
Fluorescence Detection ◽  
New Method ◽  
Hplc Determination ◽  
Hydroxybutyric Acid

Application of an improved steam distillation procedure in residue analysis. Part I. Determination of biphenyl and 2-phenylphenol in citrus fruits

The Analyst ◽  
1978 ◽  
Vol 103 (1229) ◽  
pp. 851 ◽  
Author(s):  
Akio Tanaka ◽  
Norihide Nose ◽  
Toshimasa Suzuki ◽  
Akiko Hirose ◽  
Akinobu Watanabe
Keyword(s):  
Steam Distillation ◽  
Residue Analysis ◽  
Citrus Fruits

Residue Analysis of Organophosphorus and Organochlorine Pesticides in Fatty Matrices by Gas Chromatography Coupled with Electron-Capture Detection

2006 ◽  
Vol 61 (5-6) ◽  
pp. 341-346 ◽  
Author(s):  
Jae-Woo Park ◽  
A. M. Abd El-Aty ◽  
Myoung-Heon Lee ◽  
Sung-Ok Song ◽  
Jae-Han Shim
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Simple Procedure ◽  
Linear Regression Analysis ◽  
Residue Analysis ◽  
Electron Capture Detection ◽  
Relative Standard ◽  
Wide Range ◽  
Repeatability And Reproducibility

A multiresidue method for the simultaneous determination of 22 organochlorine (OCs) and organophosphorus (Ops) pesticides (including isomers and metabolites), representing a wide range of physicochemical properties, was developed in fatty matrices extracted from meat. Pesticides were extracted from samples with acetonitrile/n-hexane (v :v, 1:1). The analytical screening was performed by gas chromatography coupled with electron-capture detection (ECD). The identification of compounds was based on their retention time and on comparison of the primary and secondary ions. The optimized method was validated by determining accuracy (recovery percentages), precision (repeatability and reproducibility), and sensitivity (detection and quantitation limits) from analyses of samples fortified at 38 to 300 ng/g levels. Correlation coefficients for the 22 extracted pesticide standard curves (linear regression analysis, n = 3) ranged from 0.998 to 1.000. Recovery studies from 2 g samples fortified at 3 levels demonstrated that the GC-ECD method provides 64.4-96.0% recovery for all pesticides except 2,4′-DDE (44.6-50.4%), 4,4′-DDE (51.1-57.5%) and 2,4′-DDT (50.0-51.2%). Both repeatability and reproducibility relative standard deviation values were < 20% for all residues. Detection limits ranged from 0.31 to 1.27 ng/g and quantification limits were between 1.04 and 4.25 ng/g. The proposed analytical method may be used as a simple procedure in routine determinations of OCs and Ops in meat. It can also be applied to the determination of pesticide multi-residues in other animal products such as butter and milk.

HPLC Determination of Furfural after Preliminary Extraction to Aqueous Phase

2007 ◽  
Vol 30 (14) ◽  
pp. 2081-2093 ◽  
Author(s):  
Hossein Sid Kalal ◽  
Mohamad Khayatzadeh Mahani ◽  
Mohamad Ghanadi Maragheh ◽  
Marzieh Chaloosi
Keyword(s):  
Aqueous Phase ◽  
Hplc Determination ◽  
Preliminary Extraction
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