4-CPA Analysis on Obelisc and Primesep Mixed-Mode Columns

 

4-CPA (4-Chlorophenoxyacetic acid) is a synthetic pesticide that mimics plant hormones called auxins. A single residue method for the EURL (European Union Reference Laboratory) was developed for 4-CPA and other acidic compounds using QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) methodology. Retention of 4-CPA was controlled on both Obelisc R and a 3 micron Primesep 100 column of the same dimension.  By using a gradient for the organic and ionic components of the mobile phase, the method is capable of separating dozens of pesticides quickly while remaining LC/MS compatible.

 

Condition 1

Column Obelisc R, 2.1×150 mm, 5 µm, 100A
Mobile Phase Gradient MeCN – 25-70%, 15 min,  7 min hold
Buffer Gradient AmAc pH 3.0- 30-60 mM, 15 min,  7 min hold
Flow Rate 0.4 ml/min
Detection UV, 270 nm

 

Condition 2

Column Obelisc R, 2.1×150 mm, 5 µm, 100A
Mobile Phase Gradient MeCN – 10-70%, 15 min,  7 min hold
Buffer Gradient AmAc pH 3.0- 20-60 mM, 15 min,  7 min hold
Flow Rate 0.4 ml/min
Detection UV, 270 nm

 

Condition 3

Column Primesep 100, 2.1×150 mm, 5 µm, 100A
Mobile Phase Gradient MeCN – 10-70%, 15 min,  7 min hold
Buffer Gradient AmAc pH 3.0- 20-60 mM, 15 min,  7 min hold
Flow Rate 0.4 ml/min
Detection UV, 270 nm

 

Description

Class of Compounds
 Insecticide, Herbicide, Fungicide,  Hydrophobic, Ionizable
Analyzing Compounds 4-CPA

 

Application Analytes:
4-CPA

Application Detection:
UV Detection

Obelisc R

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

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Primesep 100

The Primesep family of mixed-mode columns offer a wide variety of stationary phases with an unprecedented selectivity in the separation of a broad array of chemical compounds and in multiple applications. Corresponding Primesep guard columns are available with all stationary phases and do not require holders. SIELC offers a method development service which is available for all customers. Ask about our special custom LC-phases tailored for specific separations.

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SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.