With Macadamia nut from Hainan as raw material, the Macadamia nut oil was extracted by flash-extraction technology. With ratio of liquid to material, extraction voltage and extraction time as investigation factors, oil yield as investigation index, the flash-extraction process was optimized by response surface methodology and the physicochemical properties of the oil were determined. The results showed that the optimal extraction conditions of Macadamia nut oil were obtained as follows: ratio of liquid to material 9∶ 1, extraction voltage 100 V and extraction time 120 s. Under these conditions, the oil yield was 73.04%. The acid value, iodine value, saponification value and peroxide value of Macadamia nut oil were 1.20 mgKOH/g, 88.32 gI/100 g, 188.67 mgKOH/g and 3.06 mmol/kg, respectively. |