The effects of temperature on the recovery of
the carotenoids are shown in Fig. 3. As can be seen, b-carotene
recovery slightly decreased with increasing temperature. This is
explicable as decreasing the temperature increased the density of
CO2 and solubility of b-carotene in supercritical CO2. Consequently,
the extraction rate of b-carotene increased with decreasing temperature.
In addition, under this condition, the change of CO2 density
was more effective than that of solute vapor pressure, and the
lower temperature might contribute to lower degradation of bcarotene.
On the other hand, It is commonly considered that the increase in pressure results
in an increase in CO2 density, increasing the solvating power of the
supercritical fluid. Thus, higher pressure is responsible for quantitative
recoveries and stronger interactions between the fluid and
the matrix. It can be observed that an increase in operating pressure
from 20 to 40 MPa resulted in a steady increase in lycopene
yield in our study. The results were also consistent with those reported
by Topal et al. (2006).
The effects of temperature on the recovery of
the carotenoids are shown in Fig. 3. As can be seen, b-carotene
recovery slightly decreased with increasing temperature. This is
explicable as decreasing the temperature increased the density of
CO2 and solubility of b-carotene in supercritical CO2. Consequently,
the extraction rate of b-carotene increased with decreasing temperature.
In addition, under this condition, the change of CO2 density
was more effective than that of solute vapor pressure, and the
lower temperature might contribute to lower degradation of bcarotene.
On the other hand, It is commonly considered that the increase in pressure results
in an increase in CO2 density, increasing the solvating power of the
supercritical fluid. Thus, higher pressure is responsible for quantitative
recoveries and stronger interactions between the fluid and
the matrix. It can be observed that an increase in operating pressure
from 20 to 40 MPa resulted in a steady increase in lycopene
yield in our study. The results were also consistent with those reported
by Topal et al. (2006).
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