Comparison of maseration and soxhlet extraction on the total phenolic content of ethanol extract of betel leaves (Piper betle L.) using visibel spectrophotometry. JPS [Internet]. 2025 Mar. 18 [cited 2026 Oct. 21];8(1):550-63. Available from: https://journal-jps.com/new/index.php/jps/article/view/818