Preparation

All equipment may not use the same materials, and the quality of the extraction may vary depending on the preparation of the raw materials. This goes from the cleaning to avoid foreign bodies to the cut or grinding.

Dried herbals are more common, with the risk to put out some gaseous components and the benefit that the plant does not start to hydrolyze or produce non needed metabolites. Preparation may also consist in thawing (fruits may be frozen for instance), cooking (to produce aromas for instance), decoating, destemming, or even enzymatic reaction before the extraction.