Fitriyano G, Herfindo RS, Wati EK. Effect of Ethanol Concentration and Extraction Time on Piperine Yield from Piper retrofractum Vahl. Sainteks [Internet]. 2026 May 16 [cited 2026 Jun. 4];23(1):21-9. Available from: http://jurnalnasional.ump.ac.id/index.php/SAINTEKS/article/view/30337