Applicability of TLC in Multiresidue Methods for the Determination of Pesticides in Wheat Grain

Survey of Residual Pesticides in Various Fresh Fruit Crops: A Case Study

“…The samples were spotted along with marker compounds and developed in a pre-saturated tank of ethyl acetate following the method of Afful et al [30]. The method (aluminium oxide G incorporated with silver nitrate and UV exposition) is specific for the detection of halogen and several other compounds by following the method of Tiryaki and Aysal [31]. This method (enzyme inhibition with cow liver extract and β-naphthyl-acetate substrate) is very specific for the detection of phosphoric, thiophosphoric acid ester and carbamate pesticides in fruits as per the method of Katrolia et al [32].…”

Testing the Stability of Pesticides During Sample Processing for the Chlorpyrifos and Malathion Residue Analysis in Cucumber, Including Matrix Effects

“…For changing the solvent, 1 mL of the solvent mixture of EtAc/ cyclohexane 1/1 v/v was added and finally evaporated to 0.8 mL. The final volume of extract was adjusted exactly to 1 mL for the GPC (semi-automatic KL-SX-3) cleanup (Tiryaki and Aysal 2005).…”

New Approach to Multiresidue Pesticide Determination in Foods with High Fat Content Using Disposable Pipette Extraction (DPX) and Gas Chromatography−Mass spectrometry (GC-MS)

“…Analysis of target pesticides at low concentrations, particularly in grain products and other food products of high fat content, requires cleanup or elimination of matrix interferences prior to chromatographic and mass spectrometric analysis. Although liquid−liquid extraction and gel permeation chromatography (GPC) have been commonly employed for cleanup with multiresidue pesticide analysis , , solid-phase extraction (SPE) largely replaced these traditional methods due to its selectivity and elimination of large volumes of organic solvents − . The presence of fatty acids produces severe interferences with gas chromatography of pesticides, and their removal is necessary prior to analysis.…”

“…The presence of fatty acids produces severe interferences with gas chromatography of pesticides, and their removal is necessary prior to analysis. In recent years, there has been a great amount of interest in using SPE to remove sample matrix components from extracts, with most research focused on reducing or eliminating fatty acids − ,, . Florisil, strong anion-exchange sorbents (SAX) , , and weak anion-exchange sorbents including primary−secondary amine (PSA) , , aminopropyl (−NH 2 ) , , and diethylaminopropyl (DEA) have been investigated for removal of fatty acids naturally occurring in food samples.…”