Enrichment of diterpenes in green coffee oil using supercritical fluid extraction - Characterization and comparison with green coffee oil from pressing

Author(s)

Aparecida de Oliveira, Paola Maressa ^[1] ; de Almeida, Rafael Henrique ^[1] ; de Oliveira, Naila Albertina ^[1] ; Bostyn, Stephane ^[2] ; Goncalves, Cintia Bernardo ^[1] ; de Oliveira, Alessandra Lopes ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Engn Alimentos, BR-13635900 Sao Paulo - Brazil

^[2] ICARE, F-45071 Orleans 2 - France

• Document type: Journal article
• Source: JOURNAL OF SUPERCRITICAL FLUIDS; v. 95, p. 137-145, NOV 2014.
• Web of Science Citations: 9

Abstract

Supercritical fluid extraction (SFE) was used to obtain green coffee oil (Coffea arabica, cv. Yellow Catuai) enriched in the diterpenes, cafestol and kahweol. To obtain diterpenes-enriched green coffee oil relevant for pharmaceuticals, a central composite rotational design (CCRD) was used to optimize the extraction process. In this study, pressure and temperature did not have influences on cafestol and kahweol concentrations, but did affect the total phenolic content (TPC), which ranged from 0.62 to 2.62 mg GAE/g of the oil. The analysis and quantification of diterpenes according to gas chromatography indicated that green coffee oil from SFE presented a cafestol content of 50.2 and a kahweol content of 63.8 g/kg green coffee oil under optimal conditions. The green coffee oil produced from conventional pressing methods presented lower diterpenes content of 7.5 and 12.8 g/kg green coffee oil for cafestol and kahweol, respectively. When SFE was used, the content of the diterpenes in the same green coffee beans was relatively higher, approximately 85% for cafestol and 80% for kahweol. Green coffee oil from SFE also presented fatty acids, such as palmitic acid (9.3 mg MAE/g green coffee oil), the polyunsaturated linoleic acid omega-6; 11 mg MAE/g green coffee oil) and oleic acid (omega-9; 3.8 mg MAE/g green coffee oil). The physical properties for green coffee oil produced from SFE and conventional pressings showed that densities and viscosities decreased with temperature. For oils produced from both extractions, the density behaviors were similar with values ranging from 0.9419 g/cm(3) (25 degrees C) to 0.9214 g/cm(3) (55 degrees C) from pressings and 0.9365 g/cm(3) (25 degrees C) to 0.9157 g/cm(3) (55 degrees C) for the oil obtained by the SFE. The dynamic viscosity for the pressed oil ranged from 127.8798 mPa x s (25 degrees C) to 35.0510 mPa x s (55 degrees C); for the oil from SFE, these lower values ranged from 84.0411 mPa x s (25 degrees C) and 24.2555 mPa x s (55 degrees C). (C) 2014 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 10/16665-3 - Green coffee oil extraction by supercritical and pressurized fluid process, and comparison with the composition of coffee oil obtained by pressing for the small producers of the State of São Paulo - concentration analysis of bioactive diterpenes
• Grantee: Alessandra Lopes de Oliveira
• Support Opportunities: Regular Research Grants