Abstract
Optimization process for supercritical fluid extraction (SCFE) of ginger oil was performed on a laboratory scale apparatus (2×1L extraction vessel) using Taguchi’s orthogonal array method. Effects of extraction pressure, extraction temperature and carbon dioxide (CO2) flow rate on extraction yield and 6-gingerol content in ginger oil were investigated at levels ranging between 10 and 15MPa, 35–45°C and 10–20g/min, respectively. The results were compared to those obtained by high pressure Soxhlet extraction with liquid CO2, Soxhlet extraction with n-hexane, and percolation with ethanol (96%). The optimum conditions for the highest oil yield (3.10%) and highest content of 6-gingerol in ginger oil extract (20.69%) were obtained using SCFE at 15MPa, 35°C and 15g/min. The experimental oil yield and 6-gingerol content at optimum conditions were in accordance to the values predicted by computational process. Based on optimization process results, scaling-up process to a commercial scale apparatus (2×50L extraction vessel) were performed by constantly maintaining solvent-to-feed (SF) ratio. At the optimum conditions, SCFE of ginger oil was successfully scaled-up by fifty-folds with higher oil yield (3.83%) and lower 6-gingerol content (18.00%).
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