Avocado oil has high nutritional value and has been widely used in skin care products, food, health care products and other industries. The experimental results show that supercritical fluid extraction (SFE) of avocado oil is economically feasible.
Experients shows that the effect of pressure on the yield is greater than that of temperature. The yield was higher under higher pressure because the oil in avocado is carried in idioblast cells with strong lignified walls, and increasing pressure will assist in breaking the walls of the cells, so that the oil is more readily available.
The obtained yield at 350 bar is of great economical importance because of the capital investment associated with an industrial system operating at 350 bar instead of at 540 bar.
CONCLUSION
It has been shown that supercritical carbon dioxide can successfully extract high quality avocado oil. The optimum extraction pressure was determined to be at 540 bar yielding an extraction that was 95% complete within 1 hr. Reduction of the pressure to 350 bar resulted in the extraction being 94% complete within 2 hr. Although the extraction time was doubled, there would be a
substantial decrease in capital investment when operating at a lower pressure. This project has indicated that the supercritical fluid extraction of avocado oil may be economically feasible. This justifies further investigation with regard to industrialization of this process.
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