14F-30 |
Optimization of supercritical fluid extraction of anise essential oils from anise seeds using response-surface methodology |
N. Basoglu, B. Ozcelik, and A. KARAALI. Istanbul Technical University, Food Engineering Department, Istanbul, 34469, Turkey Trans-anethol which is characterised by a fine, fresh and sharp odor is the main and dominating component of anise essential oil. However, heat formed during traditional extraction processes partially decomposes its structure and leads to the oxidation of trans-anethol, which results in the formation of numerous undesirable compounds. Supercritical fluid extraction (SFE)technique has a better capability of extraction of solutes than those of conventional solvent extraction and distillation methods. Aim of this study was to optimize the supercritical CO2 extraction method which is of higher quality and yields higher trans-anethol content. Second order central composite design with three factors (pressure, temperature and time of extraction) for five levels was used. "SITEC 201-300AF-MAR I" pilot scale SFE were used for extraction. The composition of each essential oils obtained were analysed by Hewlett Packard 5971A quadropole gas chromatography-mass spectroscopy (GC-MS). Our results showed that the optimum conditions for producing anise essential oil with SFE were 117.1 minutes at 42.6C with 102 bar pressure. The optimization model developed specially for t-anethol is expressed in the equation as follows: y(t-anethol)=87.394-1.398x3+2.005x1x2+1.168x1x3-1.227x32 Evaluating the response-surface graphs for t-anethol and the other by-products t-anethol gave the maximum response which suggests that these conditions were optimum for t-anethol extraction.
Session 14F, Product Development: General
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