Table 3.
Comparison of ionic liquid-based ultrasound-assisted extraction (ILUAE) with other extraction methods, mean ± S.D. (n = 3).
| No. | Solvent | Methods | Extraction time (h) | Solvent consumption (mL/g) | Extraction efficiency ± SD (%) a | ||
|---|---|---|---|---|---|---|---|
|
| |||||||
| Carnosic acid | Rosmarinic acid | Average | |||||
| 1 | Pure water | UAE | 0.5 | 20 | 0 | 61.03 ± 3.45 | 61.03 ± 3.45 |
| 2 | 1 M NaBr | UAE | 0.5 | 20 | 0 | 53.54 ± 3.38 | 53.54 ± 3.38 |
| 3 | 80% Ethanol | UAE | 0.5 | 20 | 100.00 ± 5.44 | 64.69 ± 4.23 | 82.35 ± 4.84 |
| 4 | 1 M [C8mim]Br | UAE | 0.5 | 20 | 66.23 ± 3.85 | 100.00 ± 4.76 | 83.12 ± 4.31 |
| 5 | 80% Ethanol | HRE | 4 | 20 | 99.05 ± 4.87 | 67.61 ± 3.42 | 74.87 ± 4.15 |
| 6 | 80% Ethanol | ME | 48 | 20 | 95.04 ± 4.33 | 40.08 ± 2.66 | 48.69 ± 2.50 |
| 7 | 80% Ethanol | SE | 24 | 20 | 96.80 ± 3.96 | 67.03 ± 3.78 | 65.96 ± 3.87 |
| 8 | 80% Ethanol | SLE | 24 | 20 | 95.47 ± 3.34 | 62.22 ± 4.05 | 70.35 ± 3.70 |
a
The extraction efficiency is expressed as the observed values of target compounds and the maximum amount in each curve was taken to be 100%.