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Ionic Liquid Based Ultrasonic Assisted Extraction of Oleanolic Acid from Grape Seeds

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Figure

Figure 1. Chemical structure of oleanolic acid.
Table 1. Experimental factors level table for the RSM study in central composite design
Figure 2. Influences of ionic liquid anion and cation on the extraction yield of OA.
Figure 3. Single factor experiment. (a) Influences of [Cmol/L, and 0.9 mol/L); (b) extraction time (1 h, 2 h, 3 h, 4 h, and 5 h); (c) solvent to solid ratio (10 mL/g, 15 mL/g, 20 4mim]Cl concentration (0.1 mol/L, 0.3 mol/L, 0.5 mol/L, 0.7 mL/g, 25 mL/g, an
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