Putra, Raihan P., Syarifah I. Aisyah, Popi A. Kurniatin, and Waras Nurcholis. 2024. “Optimization of Solvent Sonication-Maceration for Enhancing Total Phenolic Content and Antioxidant Activity of Portulaca Oleracea L. Extract Using the Simplex Centroid Design Method”. Tropical Journal of Natural Product Research (TJNPR) 8 (3):6552-57. https://doi.org/10.26538/tjnpr/v8i3.12.