Faster and more selective extraction methods are urged to recover food-grade pigments and antioxidants
from microalgae – which do not resort to food-incompatible and environment-unfriendly solvents.
Hence, this study ascertained the influence of pressure, temperature, CO2 flow rate and a polar co-solvent
upon the yields of carotenoids and chlorophylls in supercritical fluid extraction of Scenedesmus obliquus
biomass. The highest carotenoid yield was attained at 250 bar and 60 C. The yields of chlorophylls, when
using plain CO2, increased slightly with pressure, but decreased with temperature and CO2 flow rate; the
highest yield of chlorophyll a was at 4:3gCO2 min1, whereas ethanol as co-solvent increased all yields
except that of chlorophyll c. The highest ratio of total carotenoids to chlorophyll a was reached at
250 bar and 60 C. A remarkable selectivity was observed under these operating conditions, which may
enable easy separation and purification of the aforementioned pigments.
Faster and more selective extraction methods are urged to recover food-grade pigments and antioxidantsfrom microalgae – which do not resort to food-incompatible and environment-unfriendly solvents.Hence, this study ascertained the influence of pressure, temperature, CO2 flow rate and a polar co-solventupon the yields of carotenoids and chlorophylls in supercritical fluid extraction of Scenedesmus obliquusbiomass. The highest carotenoid yield was attained at 250 bar and 60 C. The yields of chlorophylls, whenusing plain CO2, increased slightly with pressure, but decreased with temperature and CO2 flow rate; thehighest yield of chlorophyll a was at 4:3gCO2 min1, whereas ethanol as co-solvent increased all yieldsexcept that of chlorophyll c. The highest ratio of total carotenoids to chlorophyll a was reached at250 bar and 60 C. A remarkable selectivity was observed under these operating conditions, which mayenable easy separation and purification of the aforementioned pigments.
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