CHROMABOND® Diamino
QuEChERS method and pre-mixes
Within a few years after its devleopment by Anastassiades et al. the QuEChERS method has gained a leading position for determination of pesticide residues in food by GC-MS or LC-MS allowing rapid and cheap clean-up of strong matrix-contaminated samples.
Standard clean-up of food samples
10 g sample are homogenised with 10 ml acetonitrile. After adding the internal standard the sample is shaken with 4 g MgSO4 and 1 g NaCI and afterwards centrifuged. 1 ml of the supernantant is spiked with 25 mg CHROMABOND® Diamino and 150 mg MgSO4 and shaken again. After centrifugation the supernatant is injected into the GC/MS.

For optimising the extraction of pH-dependent compounds, for minimising decomposition of sensitive substances and for broadending the matrix spectrum, different modifications of the QuEChERS method have been elaborated.
Special silica phase for determination of pesticides in food samples

Base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2 to 8. Primary and Secondary Amine functions (PSA), 5% C removes polar compounds (e. g. organic acids, pigments, sugars) from matrices like fruit or vegetables
similar phases: Supelclean PSA, Bond Elut PSA.

Recommended application: special SPE phase for quick and cheap determination of pesticides in strongly matrix-contaminated samples by GC. QuEChERS method = Quick Easy Cheap Effective Rugged Safe.
QuEChERS clean-up mixes containing 0.15 g CHROMABOND® Diamino each.

Capacity 3 ml
Capacity 200 mg