Original scientific paper
Optimization of the Supercritical CO2 Extraction of Oil from Rapeseed Using Response Surface Methodology
Marina Cvjetko
; Faculty of Food Technology and Biotechnology, Zagreb, Pierottijeva 6, HR-10000 Zagreb, Croatia
Stela Jokić
orcid.org/0000-0003-0678-7660
; Faculty of Food Technology, Osijek, F. Kuhača 20, HR-31000 Osijek, Croatia
Žika Lepojević
; Faculty of Technology, Novi Sad, Bulevar Cara Lazara 1, RS-21000 Novi Sad, Serbia
Senka Vidović
; Faculty of Technology, Novi Sad, Bulevar Cara Lazara 1, RS-21000 Novi Sad, Serbia
Branimir Marić
; SGS Beograd Ltd, SGS Serbia Multilab, Danila Kiša 20, RS-21000 Novi Sad, Serbia
Ivana Radojčić Redovniković
; Faculty of Food Technology and Biotechnology, Zagreb, Pierottijeva 6, HR-10000 Zagreb, Croatia
Abstract
Three operating parameters (pressure, temperature and extraction time) of the supercritical CO2 extraction of oil from rapeseed have been optimised by response surface methodology to obtain high yield of oil. Results showed that data were adequately fitted into the second-order polynomial model. The linear and quadratic terms of independent variables of temperature, pressure and extraction time had a significant effect on the oil yield. Optimal conditions for oil yield within the experimental range of the studied variables were 29.7 MPa, 52.14 °C and 3.36 h, and oil yield was predicted to be 28.27 %. In addition, the mass transfer model was used to describe the extraction kinetic curves of rapeseed oil and very good agreement was found between the observed and predicted values. The fatty acid composition of rapeseed oil extracted by supercritical CO2 at optimal operating parameters and that by n-hexane were analysed by gas chromatography. The obtained oil showed similar fatty acid composition with an unsaturated fatty acid content up to 92.9 %.
Keywords
fatty acids; kinetics; rapeseed oil; response surface methodology; supercritical CO2 extraction
Hrčak ID:
83934
URI
Publication date:
18.6.2012.
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