The availability of the free surface oil explains the sharp increase
in the amount of oil extracted from the beads at the beginning of
extraction. Due to the dense interior of the beads, further extraction
only caused a marginal increase in the extracted oil. On the other
hand, the effect of oil loading on the oil extraction profile was the
same for both drying methods, where higher oil loading resulted
in a higher amount of oil extracted. This effect is expected because
higher oil loading resulted in less alginate hydrogel networks, thus
increasing the porosity of the beads.