Analysis of Solvent Concentration Effect and Extraction Method on The Total Phenolic of Syzygium myrtifolium Walp. Leaf Extract, Utami, Novi Fajar, Syarif Rizky Mulyana, Irawan Chorry Sundari, and Ramadhani Shintia , Pharmacognosy Journal, August 2025, Volume 17, Issue 4, p.461-469, (2025)