Avocado oil is made from the fruit of the ripe avocado. More oil is extracted from fruit that is past the peak of the ripeness, but if it is rotten when processed, the collected oil has a foul smell. The skin and the seed are removed before processing.
There are many suggestions for how to make avocado oil at home, but they often use coconut cream as part of the process. While it is removed via straining at the end, it is not pure avocado oil.
The fruit of the avocado, once separated from its skin and seed, is mechanically pressed or ground to a pulp, then malaxed or left alone to allow oil to form large droplets, for 40 to 60 minutes. The pulp is then removed by a centrifuge, leaving a bright green oil. The green color comes from the high chlorophyll content. Water comes away from the pulp along with the oil, so the oil which floats on the water, is allowed to flow out of holes in the collection drum. The resulting unrefined oil is somewhat thick. If further processed, the resulting refined oil will be smoother and lighter in color.
Distillation extraction means exposing a plant to water or steam to break down the plant material and release the essential oil. The oils are cooled and condensed for collection.
Steam distillation is used to extract active constituents from the peel and seed of the avocado. The oils, which are valuable for their anti-microbial properties and anti-oxidant capacity, are effectively removed simply using steam distillation. These oils, which are poorly soluble in water, do have an affinity for ethanol; a higher yield of these oils is possible if anhydrous ethanol is used.
You can purchase avocado oil online from several companies at amazon.com.