Green and Optimum Extraction of Total Polyphenols Content from Mitragyna speciosa Korth. Havil Leaves using Microwave- Assisted Natural Deep Eutectic Solvent Extraction, Prabowo, Wisnu Cahyo, Agustina Risna, Nur Yuspian, Hidayati Ramila, Rahmawati Dewi, Arifuddin M., Ambarwati Neneng Siti Silfi, Purwoko Reza Yuridian, Mun?im Abdul, and Ahmad Islamudin , Pharmacognosy Journal, February 2022, Volume 14, Issue 1, p.29-38, (2022)