3. Results and discussion
3.1. Moisture and oil content of the seeds
Due to the polar characteristic of water, the moisture content
of oilseeds limits the penetration of the organic solvent used in
the solid–liquid extraction processes into porous plant structure
and restricts the mass transfer at a molecular level inside the pores
by inhibiting the wetting of seed surface by the solvent. Thus, it
is preferable to have a low moisture content in plant materials in
solid–liquid extraction processes. However, the moisture content
in plant materials should be at a level which will protect the flexibility
of plant tissue and prevent it from falling apart and will not
make the penetration of the solvent used in the separation process
difficult. The moisture and volatile contents of rosehip seeds
were determined as 6.7 ± 0.3%wt. and 6.5 ± 0.3%wt. respectively for
waste rosehip seeds in the food processing process and for original
rosehip seeds which were separated from its fruit before food
processing process. In order to determine oil recovery rate in separation
processes carried out by scCO2 extraction, the initial oil
contents of oilseeds are 14.5 ± 0.7%wt. and 13.4 ± 0.3%wt., respectively
for waste and original rosehip seeds. make the penetration of the solvent used in the separation process
difficult. The moisture and volatile contents of rosehip seeds
were determined as 6.7 ± 0.3%wt. and 6.5 ± 0.3%wt. respectively for
waste rosehip seeds in the food processing process and for original
rosehip seeds which were separated from its fruit before food
processing process. In order to determine oil recovery rate in separation
processes carried out by scCO2 extraction, the initial oil
contents of oilseeds are 14.5 ± 0.7%wt. and 13.4 ± 0.3%wt., respectively
for waste and original rosehip seeds.