Microwave-assisted extraction of secoisolariciresinol diglucoside from flaxseed hull
2007
Zhang, W. | Xu, S.
Microwave-assisted extraction (MAE) of secoisolariciresinol diglucoside (SDG) from defatted flaxseed hull (DFH) was studied. The effects of pre-soaking methods and extraction parameters (ethanol concentration (0-100%, v/v), microwave energy input (50-390 W), liquid to solid ratio (5:1 to 40:1, mL g-1) and irradiation time (10-330 s)) on the SDG yield were investigated. Response surface methodology (RSM) was applied to optimise the MAE conditions as irradiation time 90.5 s, ethanol concentration 40.9% (v/v), liquid to solid ratio 21.9:1 (mL g-1) and microwave power 130 W. The SDG recovery from DFH with MAE was 11.7 g SECO kg-1 DFH (on dry-weight basis), which was significantly higher than that of stirring extraction (10.0 g SECO kg-1 DFH) and Soxhlet extraction (7.60 g SECO kg-1 DFH). Compared with stirring extraction and Soxhlet extraction, MAE showed its superiority in improving SDG yield and saving time and energy.
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