Everything about Malaxation totally explained
Malaxation, a stage in the process of
olive oil extraction, is the action of slowly churning or mixing milled
olives in a specially designed mixer for 20 to 40 minutes. The churning allows the smaller droplets of
oil released by the milling process to aggregate and be more easily separated. The paste is normally heated to around 27°C during this process. Oil yield is proportional to the temperature and mixing time. However, the use of higher temperatures and longer mixing times increases
oxidation of the oil and therefore decreases shelf life, so a compromise must be struck. Also, the usage of higher temperatures doesn't allow for the labelling of the oil as "cold extracted", a term used widely as a marketing tactic, especially in the
European Union.
It is now possible with newer equipment to use a blanket of
inert gas such as
nitrogen or
carbon dioxide over the olive paste, which greatly reduces oxidation. This allows for an increased yield without compromising the quality of the oil.
After malaxation is complete, the paste is then sent to a phase separator. Nearly all producers use a
decanter centrifuge for this process. Traditionally the olive oil was separated from the paste using a large press that was either screwed down or weighted with rocks.
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