| Popis: |
Using ultrasonic-extraction technology, the condition of extracting the active compounds-flavonoids and rosmarinic acid ofPerillawas studied. The effects of four main factors include ultrasonic power, temperature, time and solid-liquid ratio on the extraction-rate of the flavonoids and the rosmarinic acid ofPerillawere reviewed by single factor experiments,and the flavonoids and the rosmarinic acid was determined by NaNO2-Al (NO3)3-NaOH method and FeSO4method. On the base of single factor experiments, the extraction technique was optimized in the orthogonal test. The result showed that temperature was the most important factor in the influencing factors on the extraction-rate. The subsequence of importance was temperature > time > solid-liquid ratio > ultrasonic. The optimal extraction conditions were: extraction solvent 3%borax, solid-liquid ratio 1:50(w/v), ultrasonic power 300W, time 90min , temperature 75°C. Under the optimum technological conditions, 34.64mg/g of flavonoids and rosmarinic acid fromPerillacould be obtained. |
