Optimasi ekstraksi rimpang temulawak (Curcuma xanthorrhiza Roxb.) dengan pelarut Ionic Liquid 1-Heksadesil-3- Metilimidazolium Bromida menggunakan metode ultrasonic assisted extraction (UAE) = Optimization of Javanese turmeric rhizome (Curcuma xanthorrhiza Roxb.) extraction with Ionic Liquid 1-Hexadecyl-3- Methylimidazolium Bromide using ultrasonic assisted extraction (UAE) method