The passion fruit, also named as egg-shaped fruit, is from Brazil
and has been cultivated in the tropics, subtropics and temperate
regions on a large scale. The passion seeds are usually discarded as
a byproduct after extraction of the juice from the fruit [1–3].
The edible vegetable oil is conventionally extracted using the
mechanical pressing process or solvent. Although the properties
of oil extracted by the mechanical press process are better,
since oil is not contaminated with any chemical but the extraction
rate is low. The extraction rate is higher using solvent
extraction but solvent is mixed with oil. In recent years, supercritical
carbon dioxide (SC-CO2) extraction of the vegetable oil has
attracted considerable attention as a promising alternative to conventional
solvent extraction and mechanical pressing process. The
main reason is that SC-CO2 not only has the higher extraction
rate but also is non-toxic, non-flammable, non-explosive, costefficient,
readily available and easy to remove from the extracted
materials [4].
The efficiency of SC-CO2 extraction can be affected by many factors
including pressure, temperature and extraction time. In most
of the previous studies, the process conditions have been merely
optimized by conducting one-factor-at-a-time experiments.
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