SPE is a separation principle using liquid chromatography using selective adsorption and selective elution. The more common method is to pass the liquid sample solution through the adsorbent, retain the substance to be tested, and then use the appropriate strength solvent to wash away the impurities, and then quickly elute the test substance with a small amount of solvent, thereby achieving the purpose of rapid separation, purification and concentration.
It is also possible to selectively adsorb the interfering impurities and let the measured substance flow out; or simultaneously adsorb the impurities and the tested substance, and then selectively elute the test substance with a suitable solvent.
The total mass of the analyte and the interferent adsorbed by the adsorbent in the cartridge should not exceed the adsorbate, 5% of the total mass. The volume of the eluent should generally be 2-5 times the volume of the cartridge of the extraction cartridge.
Interaction of SPE Cartridge
The force in the solid-phase extraction process is divided into several parts, including non-polar interaction, polar interaction, iron interaction, and secondary interaction. Non-polar extraction is suitable for the separation of compounds with different structures, and can keep compounds with non-polar genes on absorbents containing non-polar functional groups; polar interaction contains hydrogen bonding, dipole, induced dipole and other interactions, polar interaction has obvious effect in non-polar solvents when the primary polar has interacted with silica gel bonded absorbents; iron interaction is good for enhancing retention of targeted compounds and promotion of elution process.
The force in the solid-phase extraction process is divided into several parts, including non-polar interaction, polar interaction, iron interaction, and secondary interaction. Non-polar extraction is suitable for the separation of compounds with different structures, and can keep compounds with non-polar genes on absorbents containing non-polar functional groups; polar interaction contains hydrogen bonding, dipole, induced dipole and other interactions, polar interaction has obvious effect in non-polar solvents when the primary polar has interacted with silica gel bonded absorbents; iron interaction is good for enhancing retention of targeted compounds and promotion of elution process.
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