SPE

Benzenesulphonic acid modified silica cation exchanger for SPE (SCX)

Base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2 to 8, benzenesulphonic acid modified silica, strongly acidic cation exchanger (capacity ~ 0.5meq/g). Adsorbent with hydrophobic and Π-Π interactions (benzene ring). Ion exchange of organic compounds from aqueous matrix. Elution of interesting compounds with solvent systems, which compensate the ionic and nonpolar interactions, e.g. methanolic HCl.

Recommended application: amino acids, amines, chlorophyll, PCB.

Combination phase for SPE analysis of PCB

Special combination phase:
SA: strongly acidic cation exchanger based on silica with benzenesulphonic acid modification.
SiOH: unmodified silica for removal of polar compounds.

Recommended application: extraction of PCB from waste oil (hexane extract).

Quaternary ammonium modified silica anion exchanger for SPE (SAX)

Base material silica, pore size 60 Å, particle size 45 µm, specific surface 500 m²/g, pH stability 2 to 8. Silica modified with quaternary amine. Strongly basic anion exchanger (capacity ~ 0.3 meq/g). Not suited for very strong anions such as sulphonic acids, because these are difficult to elute.

Recommended application: organic acids, caffeine, saccharin.

Combination phase for SPE analysis of PCBs

H₂SO₄: H₂SO₄-impregnated silica phase for oxidation of accompanying compounds to ionic and/or polar compounds.
SA: strongly acidic cation exchanger based on silica with benzenesulphonic acid modification for removal of ionic and sulphur-containing compounds.

Recommended application: extraction of PCBs from oil with reference to German industrial standard DIN 51527, part 1. This combination column is used together with a SiOH column.

Kieselguhr phase for liquid-liquid extraction

Base material coarse-grained kieselguhr, large pore size, high pore volume, constantly high batch-to-batch quality, pH working range 1 to 13.

Application: liquid-liquid extraction of highly viscous aqueous solutions such as physiological fluids (blood, plasma, and serum) in clinical chemistry, dyes in textiles, environmental and food analysis.

Glass columns availlable on request.

Empty CHROMABOND^® column (PP) for SPE, one PE-filter element is already inserted in the column.

96-well polypropylene plates for simultaneous filtration of 96 samples
Advantages of this high-throughput system are:

• economical by saving time and solvent
• use of multi-channel pipettors facilitates liquid transfer steps
• readily adaptable to all common automated/robotic handling systems
• minimised dead volume (≤ 40µl)
• membrane materials correspond to the respective CHROMAFIL^® syringe filters

50 bags of 14.5g (for max. 20ml aqueous solution each).

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.
Special silica phase for determination of pesticides in food samples with primary and secondary amine functions (PSA).
Particle size 45 µm, specific surface 500 m²/g, pH-stability from pH 2 to 8.