Soxhlet extraction is generally higher than hexane. Therefore,
co-solvent(s) sometimes is added together with solvents as a
better cost deal. In addition, some of the co-solvent helps
increase the polarity of the liquid phase within extraction
process [6], [11]. When co-solvent(s) (i.e. isopropanol) is
mixed with hexane, final extracted compounds and kinetics
of extraction are increased significantly [11].
There are many factors influent the Soxhlet extraction
process such as matrix characteristics and particle size of
samples, and boiling temperature. Temperature not only
affects to the yield and quality of final products, but also
reduces visual color of the extracted compounds. It can be
slightly solved by using membrane separation or vacuum