Response surface optimization of ultrasound-assisted oil extraction from autoclaved almond powder
2009
An investigation into ultrasound-assisted extraction and autoclaving pretreatment was conducted for the oil extraction from almonds. The best possible combination of extraction parameters was obtained with the response surface methodology (RSM), at a three-variable, three-level experiment Box-Behnken design (BBD). The optimum extraction parameters were as follows: extraction time, 55min; extraction temperature, 51°C; and solvent/sample ratio, 19:1, at a fixed ultrasonic frequency of 40kHz and power of 150W. Under these conditions, the oil recovery was 81.89±0.23% for the autoclaved almonds, which well matches with the predicted value. Furthermore, the oil composition was analyzed with GC-MS, and the effect of the autoclaving on the oil extraction was evaluated. The results showed that the autoclaving pretreatment increased the oil recovery, without affecting the oil composition, by 8.69%, which confirmed the efficacy of the autoclaving on the oil extraction from almond powder.
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