Optimasi ekstraksi rimpang temulawak (curcuma xanthorrhiza roxb.) menggunakan pelarut ionic liquid 1-tetradesil-3- metilimidazolium klorida dengan metode ultrasound assisted extraction = Optimization of javanese turmeric rhizome (curcuma xanthorrhiza roxb.) extraction using ionic liquid solvent 1-tetradecyl-3-methylimidazolium chloride with ultrasound assisted extraction method