Optimization of ultrasonic-assisted extraction of phenolic compounds from Clinacanthus nutans using ionic liquid (ILs) binary solvent: Application of Peleg’s model and response surface methodology - Tong Yen Suan; Saiful Irwan Zubairi; Ruth Naomi Manuel; Zalifah Mohd Kasim; Nur Huda-Faujan (PLoS ONE, 2025)