Abstract:

Objective: To optimize the extraction of celery seed oil with liquid carbon dioxide under the assistance of ultrasonic for achieving maximum oil yield. Methods: The effects of four process conditions, i.e., extraction pressure, length of extraction time, ultrasonic power and material-to-liquid ratio on the yield of celery seed oil were investigated using single factor and orthogonal array design methods. Results: The significance sequence of the conditions influencing the yield of celery seed oil was as follows: length of extraction time > ultrasonic power > extraction pressure > material-to-liquid ratio, and their optimum values were as follows: temperature 30 min, ultrasonic power 100 W, extraction pressure 4 MPa and material-to-liquid ratio 1:7 (m/V). Under these conditions, the yield of celery seed oil reached up to 2.8%. Conclusion: Ultrasonic-assisted liquid carbon dioxide extraction provides a new and efficient separation technique for celery seed oil extraction.

Key words: celery seed oil, ultrasonicd-assisted extraction, liquid carbon dioxide, orthogonal array design