Agilent Manuals

This application note describes a method for analyzing 20 contract laboratory protocol (CLP) pesticides in olive oil using an Agilent GC-µECD system. A QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) with dispersive solid phase extraction (dSPE) procedure cleaned the sample prior to analysis. A dual µECD and dual capillary GC column approach accomplished simultaneous primary and confirmatory analysis. The primary column, an Agilent J&W DB-35ms 30 m × 0.25 mm × 0.25 µm and a confirmatory column, an Agilent J&W DB-XLB 30 m × 0.25 mm × 0.50 µm effectively resolved all 20 CLP pesticides. An unpurged two-way capillary flow technology splitter divided the flow from a single injection port to the two analytical GC columns. Endosulfan sulfate and endosulfan 1 were present in the olive oil sample.

This application note describes a simple and rapid extraction procedure for pesticide residues in lemon essential oils. The method uses Agilent Bond Elut QuEChERS extraction and modified dispersive SPE coupled with GC/MS.

Using the AOAC buffered extraction method followed by the use of the Universal Dispersive SPE method for preparing lettuce and apple samples for residue analysis by GC/MS

This application note details a quick and effective analytical method for the determination of low and trace level polycyclic aromatic hydrocarbons (PAHs) in fish samples as an alternative to procedures involving more time consuming and complex techniques. A simplified QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method with dispersive solid phase extraction (dSPE) provided sufficient sample matrix cleanup while preserving low level analyte detection. A pressure controlled tee was installed post column to implement the use of automated backflush to diminish residual sample carryover and reduce instrument cycle times. The Agilent J&W DB-5ms Ultra Inert (UI) 20 m × 0.18 mm , 0.18 µm column effectively resolved the 16 targeted PAHs. A GC/MS method employing selective ion monitoring (SIM) was calibrated at the 10, 25, 50, 100, 250, 500, and 1000 ng/mL PAH levels, yielding excellent linearity and reproducibility. The spiked levels for recovery determinations were 25, 250, and 500 ng/mL. Recoveries ranged from 80% and 139% with RSD below 6%.

A method for the determination of low ppm and trace level organophosphorus pesticides residues in apple extract using Agilent J&W DB-35ms Ultra Inert GC Column for GC/MS/FPD

Analysis of Pesticide Residues in Apples using Agilent Bond Elut QuEChERS AOAC Kit by LC/MS/MS Detection

This study investigates the blind added multipesticides in cherry tomato and cucumber using Agilent Bond Elut QuEChERS extraction kits and Agilent 5975T LTM GC/MSD. The method allows quick onsite pesticides diagnostics with the transportable Agilent 5975T LTM GC/MSD using Agilent Technologies DRS software, RTL pesticides library, and fast Bond Elut QuEChERS sample preparation. The instrument provides the same excellent performance as previous Agilent mass spectrometers.

This application note presents the performance of Agilent Bond Elut Plexa multi-compound analysis system for the detection of six systemic antifungal drugs in human plasma. The system includes Agilent Bond Elut Plexa polymeric sorbent, Agilent Pursuit XRsUltra 2.8 Diphenyl column and Agilent 1260 Infinity LC Triple Quadrupole LC/MS. Agilent Bond Elut Plexa delivered extremely clean samples, which was demonstrated by detection down to pg levels. All compounds showed near 100% recovery and a single digit % RSD. Superb linearity was achieved in the calibration curves with R2 ¡ 0.995 for all compounds.

This application note describes the development of a sample extraction, cleanup, and enrichment method with an Agilent Bond Elut Plexa cartridge and a separation method using an Agilent Poroshell 120 column, with quantification by HPLC. The method is simple and effective for the extraction, enrichment, and analysis of multiple phenol compounds in drinking water.

This application note describes a method for rapidly determining the PE:PP ratio in blends using the Agilent Cary 630 FTIR spectrometer.

This Application Note describes the separation of four proteins by anion exchange chromatography using four different high salt-containing elution buffers (up to 2 M) for linear and step gradients.

This application note describes a method for determining fatty acid methyl esters (FAMEs) in salmon oil using automated sample preparation. The method involves the conversion of salmon oil to FAMEs, which are then measured by gas chromatography. The method has good repeatability and saves time.

This paper presents an analytical method for the determination of 11 quinolone antibiotic residues in bovine liver. The method involves a rapid and efficient pretreatment using Agilent Bond Elut QuEChERS kits, followed by extraction and partitioning, and dispersive solid phase extraction for cleanup. The compounds are then determined using LC-ESI-MS-MS in positive ion MRM mode. The method demonstrates good accuracy and precision, with a limit of quantification significantly lower than the maximum residue limit for quinolones in food producing animals.

Analysis of Pesticide Residues in Spinach Using Agilent Bond Elut QuEChERS AOAC Kits by GC/MS

This application note describes the use of a quick, easy, cheap, effective, rugged, and safe (QuEChERS) sample preparation approach described in the European Committee (EN) for extraction and cleanup of 17 GC-amenable multiple pesticide class residues in apple. The method involves initial extraction in an aqueous/acetonitrile system, an extraction/partitioning step after the addition of salt, and a cleanup step using dispersive solid phase extraction (dispersive SPE). The two different dispersive SPE cleanup approaches (1 mL and 6 mL aliquot volumes) were evaluated simultaneously after sample extraction. The target pesticides in the apple extracts were then analyzed by gas chromatography/mass spectrometry (GC/MS) operating in selective ion monitoring (SIM) mode. The method was validated in terms of recovery and reproducibility. The limit of quantitation (LOQ) for pesticides in apple is 10 ng/g. This application employed Agilent's Bond Elut QuEChERS kit and produced results well below the maximum residue limits (MRLs) for all the pesticides screened. The spiked levels for the recovery experiments were 10, 50, and 200 ng/g. Recoveries ranged between 68 and 112% (86.0% on average), with RSD below 15% (4.7% on average).