Optimasi cairan ionik 1-dodesil-3-metilimidazolium klorida ([C12MIM]Cl), terhadap ekstraksi rimpang temulawak (curcumae xanthorrhizae rhizoma) dengan metode ultrasound assisted extraction = Optimization of ionic liquid 1-dodecyl-3-methylimidazolium chloride ([C12MIM]Cl) to the extraction of javanese turmeric rhizomes (curcumae xanthorrhizae rhizome) by ultrasound assisted extraction method