2.3. Extraction assisted by high pressure
The high-pressure equipment was from Kefa Food Equipment Ltd,
Baotou, China. Pressure was generated by a hydraulic pump in
combination with a pressure intensifier. The pressure transmitting
medium was dioctyl sebacate. The pressure chamber was controlled at
constant temperature (30 °C) by a water bath. All processing
conditions, including pressure, time, and temperature, were controlled and programmed using a computer. Longan samples (10 g)
were mixed with 500 mL of 50% ethanol and were pressurized at
500 MPa for 2.5 min. After de-pressurization, the extracted solution
was collected,filtered and stored. The yield for high-pressure-assisted
extraction of longan (HPEL) was found to be 17.92±0.21%