Carla Piantino - Academia.edu (original) (raw)
Uploads
Papers by Carla Piantino
Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: superc... more Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: supercritical carbon dioxide (SC-CO 2 ), ethanol and methanol. Supercritical extraction was carried out at temperatures of 40, 50 and 60 • C and pressures of 20, 30 and 40 MPa. Four phenolic compounds were analysed in the extracts by high-performance liquid chromatography: 3,5-diprenyl-4-hydroxycinnamic acid (DHCA or artepillin C); 3-prenyl-4-hydroxycinnamic acid (PHCA); 4-hydroxycinnamic acid (p-coumaric acid) and 4-methoxy-3,5,7-trihydroxyflavone (kaempferide). The global extraction yields (X 0 ) obtained by the conventional methods with ethanol and methanol were higher than those obtained by SC-CO 2 . However on analysing the components of interest extracted at 60 • C and 40 MPa, the extraction yields of kaempferide, DHCA and PHCA were 156%, 98% and 64% higher, respectively, than in the ethanolic extracts. Only the p-coumaric acid extraction yield was better when extracted using the conventional method.
The Journal of Supercritical Fluids, 2008
Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: superc... more Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: supercritical carbon dioxide (SC-CO 2 ), ethanol and methanol. Supercritical extraction was carried out at temperatures of 40, 50 and 60 • C and pressures of 20, 30 and 40 MPa. Four phenolic compounds were analysed in the extracts by high-performance liquid chromatography: 3,5-diprenyl-4-hydroxycinnamic acid (DHCA or artepillin C); 3-prenyl-4-hydroxycinnamic acid (PHCA); 4-hydroxycinnamic acid (p-coumaric acid) and 4-methoxy-3,5,7-trihydroxyflavone (kaempferide). The global extraction yields (X 0 ) obtained by the conventional methods with ethanol and methanol were higher than those obtained by SC-CO 2 . However on analysing the components of interest extracted at 60 • C and 40 MPa, the extraction yields of kaempferide, DHCA and PHCA were 156%, 98% and 64% higher, respectively, than in the ethanolic extracts. Only the p-coumaric acid extraction yield was better when extracted using the conventional method.
The Journal of Supercritical Fluids, 2009
Supercritical carbon dioxide (SC-CO 2 ) was employed to extract omega-3 rich oil from Sacha inchi... more Supercritical carbon dioxide (SC-CO 2 ) was employed to extract omega-3 rich oil from Sacha inchi (Plukenetia volubilis L.) seeds and partially defatted cake. For ground seeds, the supercritical extraction was carried out at temperatures of 40, 50 and 60 • C and pressures of 300 and 400 bar, and for the cold pressed partially defatted cake, the extraction was carried out with 300 bar at 40 • C and with 400 bar at 60 • C. The global extraction yields (X 0 ), oil solubility, fatty acid composition of the oil and tocopherol content were determined. The seed samples used in this work contained 54.3% oil, of which 50.5% was linoleinc acid (-3). The maximum extraction recovery for the seeds as 92% at 400 bar and 60 • C, but on one occasion a recovery of 99.1% oil was obtained when cold pressed extraction was employed, followed by supercritical extraction at 400 bar and 60 • C. A high tocopherol content of about 2-3 g/kg of oil was obtained.
Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: superc... more Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: supercritical carbon dioxide (SC-CO 2 ), ethanol and methanol. Supercritical extraction was carried out at temperatures of 40, 50 and 60 • C and pressures of 20, 30 and 40 MPa. Four phenolic compounds were analysed in the extracts by high-performance liquid chromatography: 3,5-diprenyl-4-hydroxycinnamic acid (DHCA or artepillin C); 3-prenyl-4-hydroxycinnamic acid (PHCA); 4-hydroxycinnamic acid (p-coumaric acid) and 4-methoxy-3,5,7-trihydroxyflavone (kaempferide). The global extraction yields (X 0 ) obtained by the conventional methods with ethanol and methanol were higher than those obtained by SC-CO 2 . However on analysing the components of interest extracted at 60 • C and 40 MPa, the extraction yields of kaempferide, DHCA and PHCA were 156%, 98% and 64% higher, respectively, than in the ethanolic extracts. Only the p-coumaric acid extraction yield was better when extracted using the conventional method.
The Journal of Supercritical Fluids, 2008
Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: superc... more Extracts from Baccharis dracunculifolia leaves were obtained using the following solvents: supercritical carbon dioxide (SC-CO 2 ), ethanol and methanol. Supercritical extraction was carried out at temperatures of 40, 50 and 60 • C and pressures of 20, 30 and 40 MPa. Four phenolic compounds were analysed in the extracts by high-performance liquid chromatography: 3,5-diprenyl-4-hydroxycinnamic acid (DHCA or artepillin C); 3-prenyl-4-hydroxycinnamic acid (PHCA); 4-hydroxycinnamic acid (p-coumaric acid) and 4-methoxy-3,5,7-trihydroxyflavone (kaempferide). The global extraction yields (X 0 ) obtained by the conventional methods with ethanol and methanol were higher than those obtained by SC-CO 2 . However on analysing the components of interest extracted at 60 • C and 40 MPa, the extraction yields of kaempferide, DHCA and PHCA were 156%, 98% and 64% higher, respectively, than in the ethanolic extracts. Only the p-coumaric acid extraction yield was better when extracted using the conventional method.
The Journal of Supercritical Fluids, 2009
Supercritical carbon dioxide (SC-CO 2 ) was employed to extract omega-3 rich oil from Sacha inchi... more Supercritical carbon dioxide (SC-CO 2 ) was employed to extract omega-3 rich oil from Sacha inchi (Plukenetia volubilis L.) seeds and partially defatted cake. For ground seeds, the supercritical extraction was carried out at temperatures of 40, 50 and 60 • C and pressures of 300 and 400 bar, and for the cold pressed partially defatted cake, the extraction was carried out with 300 bar at 40 • C and with 400 bar at 60 • C. The global extraction yields (X 0 ), oil solubility, fatty acid composition of the oil and tocopherol content were determined. The seed samples used in this work contained 54.3% oil, of which 50.5% was linoleinc acid (-3). The maximum extraction recovery for the seeds as 92% at 400 bar and 60 • C, but on one occasion a recovery of 99.1% oil was obtained when cold pressed extraction was employed, followed by supercritical extraction at 400 bar and 60 • C. A high tocopherol content of about 2-3 g/kg of oil was obtained.