US EPA

1617165 

Journal Article 

Extraction of caffeine, chlorogenic acids and lipids from green coffee beans using supercritical carbon dioxide and co-solvents 

de Azevedo, ABA; Mazzafera, P; Mohamed, RS; Vieira de Melo, SAB; Kieckbusch, TG 

2008 

1 

Brazilian Journal of Chemical Engineering
ISSN: 0104-6632
EISSN: 1678-4383 

25 

3 

543-552 

WOS:000258690300012 

The paper reports oil experimental data oil the extraction
of caffeine, coffee oil and chlorogenic acids from green coffee beans using pure supercritical
Co-2 and supercritical CO, modified with ethanol (5% w/w) and isopropyl alcohol (5% w/w) at 50
and 60 degrees C and 15.2 24.8 e 35.2 MPa. In this Study extraction kinetics were obtained for
all assays i.e. samples were collected at several time intervals for each solvent and mixed
solvent. When pure CO, and CO-ethanol mixed solvent were used, all increase in pressure resulted
in ail increase in the amount Of Oil extracted. When CO, was modified with isopropyl alcohol, the
amount Of coffee oil extracted also increased with pressure. Caffeine extraction initially
increased and subsequently decreased with pressure. Chlorogenic acids were only extracted when
isopropyl alcohol was used as a cosolvent. An increase in extraction temperature resulted in a
decrease of caffeine and oil extraction (retrograde condensation) when only CO, was used as
solvent. With the use of co-solvent this retrograde behavior was no longer observed and the
increase in temperature resulted in the increase in the extracted amounts of caffeine, coffee oil
and chlorogenic acids. 

supercritical extraction; coffee; coffee oil; caffeine; chlorogenic acid; co-solvent