Febrianto N, Wahyudi T. Optimization study of ultrasound-assisted polyphenol extraction from cocoa powder and utilization of its grounds using papain solution. PelitaPerkebunan [Internet]. 30Apr.2016 [cited 24Nov.2024];32(1):22-3. Available from: https://ccrjournal.com/index.php/ccrj/article/view/209