PE frit (20 μm)
bed wt., 50 mg
pk of 108
silica gel base material (irregularly shaped, acid washed)
70 Å pore size
~0.43 meq/g capacity
Food and Beverages
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11 - Combustible Solids
> 240 °C
SPE retention mechanism in this case is based on the electrostatic attraction of charged functional groups of the analyte(s) to oppositely charged functional groups on the sorbent.
Retention occurs through polar interaction between the sorbent and analytes. Typical sample matrices that can be employed in normal-phase SPE include hydrocarbon or fatty oils diluted in a solvent like hexane, isooctane, chlorinated solvent, THF, diethyl ether, or ethyl acetate.