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Olive pomace oil is olive oil that is extracted from olive pulp after the first press. Once the mechanical oil extraction of olive oil is complete, approximately 5–8% of the oil remains in the pulp, which then needs to be extracted with the help of solvents, an industrial technique used in the production of most other edible oils including canola, peanut, and sunflower.
In crude olive oil production, the traditional system, i.e. pressing, and the three-phase system produce a press cake and a considerable amount of olive mill waste water while the two-phase system, which is mainly used in Spain, produces a paste-like waste called "alperujo" or "two-phase pomace" that has a higher water content and is more difficult to treat than traditional solid waste.
Refined olive pomace oil is obtained from crude olive pomace oil by refining methods which do not lead to alterations in the initial glyceridic structure. It has a free acidity, expressed as oleic acid, of not more than 0.3 grams per 100 grams and its other characteristics correspond to those fixed for this category in the IOC standard [ note 4 ]
Olive oils sold as the grades extra virgin olive oil and virgin olive oil therefore cannot contain any refined oil. [65] Crude olive pomace oil is the oil obtained by treating olive pomace (the leftover paste after the pressing of olives for virgin olive oils) with solvents or other physical treatments, to the exclusion of oils obtained by re ...
The United States is not a member of the IOC, and the US Department of Agriculture does not legally recognize its classifications, such as extra-virgin olive oil. In October 2011, the United States adopted new olive oil standards, revising those that had been in place since 1948, which affected importers and domestic growers and producers by ensuring conformity with the benchmarks commonly ...
Olive pomace, the byproduct of olive oil extraction, was widely used throughout classical antiquity as an alternative fuel source to wood and charcoal. [4] Use of olive pomace peaked in the Roman era , when, due to urban growth and proto-industrial activity, markets for imported olive pomace developed. [ 4 ]