Journal
JOURNAL OF CO2 UTILIZATION
Volume 34, Issue -, Pages 479-489Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.07.032
Keywords
Supercritical antisolvent precipitation; Rosemary; Antioxidant activity; Morphology; Particle size distribution
Funding
- Ministerio de Economia y Competitividad of Spain [AGL2016-76736-C3-1-R]
- Gobernacion de Bolivar
- Fundacion Ceiba, Colombia
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The simultaneous fractionation and precipitation of an ethanolic extract of rosemary (Rosmarinus officinalis L.) using supercritical carbon dioxide anti-solvent technique was studied, with the target of separate in two different fractions the key antioxidants of rosemary (i.e. rosmarinic acid, carnosic acid and carnosol). The effect of pressure and temperature on the fractionation process was investigated, together with the morphology and particle size distribution of the precipitates. Additionally, the chemical composition of the oleoresins were analyzed and reported. In the range of pressures (9-20 MPa) and temperatures (313-333 K) used in this work, the precipitates presented a 2-3 fold enrichment of rosmarinic acid, while carnosic acid and carnosol were concentrated (2-3 fold enrichment) in the oleoresin fractions. Furthermore, in general, oleoresins presented higher antioxidant activity than precipitates. Particles produced with a nozzle of diameter 101.6 mu m were smaller and more spherical with increasing pressure (mean value 4-10 mu m at 20 MPa) and decreasing temperature.
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