Alfatiha, R.T. and Nisa, F. 2026. Quantitative Measurement of Flavonoid Content of Kecapi Leaves (Sondoricum koetjape Merr.). Hydrogen: Jurnal Kependidikan Kimia. 14, 4 (Aug. 2026). DOI:https://doi.org/10.33394/hjkk.v14i4.21062.