Purifying liquid extracts
Extraction refers to the selective recovery of compounds of interest from a sample. After this step, a liquid extract is obtained – very often containing interfering compounds likely to hinder or bias the solute analysis. Therefore, it is common to proceed to an extract purification step.
Concerning the process, purification is the selective extraction of the solute contained in the liquid extract. LLE or SPE extractions may be performed.
As with the extraction step itself, the purification step is not necessarily quantitative – it depends on the intended application and operating conditions.