SPE

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.
Empty PP centrifuge tube with screw cap, 50 ml, without QuEchERS mixtures.

aluminium oxide, acidic, neutral, basic

aluminium oxide, high purity, pore volume 0.90ml/g, particle size 60 to 150µm, specific surface 150m²/g, acidic, pH 4 ± 0.5, recommended application: together with phase SA for PCB and pesticides.

Alox A: acidic, pH 4 ± 0.5
Alox N: neutral, pH 7 ± 0.5
Alox B: basic, pH 9.5 ± 0.5

SPE-columns.

Polystyrene-divinylbenzene adsorbent resin for SPE
Basic material: Highly porous polystyrene-divinylbenzene copolymer specific surface 1200 m²/g.
Particle size 50-100 µm very high binding capacity, up to 30 % of adsorbent weight.
Recommended application: aromatic compounds, phenols from water, nitroaromatics from water, pesticides from water, PAHs from oil

Octadecyl modified silica phase for SPE of polar analytes

Base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2 to 8, special octadecyl phase for polar analytes, not endcapped, carbon content 15%.

Recommended applications: more polar compounds like pesticides and their polar degradation products, phenols, phenoxycarboxylic acids, nitroaromatics, pharmaceuticals.

Phenyl modified silica phase for SPE

Base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2 to 8. Phenyl phase, carbon content 8%
polarity similar to C₈. In addition to hydrophobic interactions more selective adsorption is possible by Π-Π interactions due to the electron density of the phenyl ring.

Recommended applications: aflatoxins, caffeine, phenols.

Octyl modified silica phase for SPE, not endcapped

Base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2 to 8. Octyl phase, not endcapped, carbon content 8%, similar to C₁₈, however slightly more polar. Secondary interactions with polar compounds are more pronounced due to shorter alkyl chains.

Recommended applications: pesticides, PCBs.

Cyanopropyl modified silica phase for SPE

Base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2-8, cyanopropyl phase, carbon content 5.5%, polar to mid-polar. In addition to weak hydrophobic interactions selective interactions are possible due to the high electron density of the CN group.

Recommended application: cyclosporins, carbohydrates.

Combination phase for SPE analysis of PAH

Special combination phase, cyanopropyl phase for selective adsorption of polycyclic aromatics via Π-Π interactions, unmodified silica phase for removal of polar compounds.

Recommended applications: Extraction of the 16 PAHs according to EPA from soil samples.

Special silica phase for SPE of THC and derivatives acidic analytes from biological fluids (urine, blood ...)

base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2 to 8, special bifunctional modification - C₈/ SB (strong anion exchanger - quaternary amine).

Recommended applications: extraction of THC and derivatives from urine, blood, serum, plasma, acidic analytes from biological fluids.