Kamkayan, Pichanan, and Kitipong Assatarakul. “Effect of Single-Factor by Ultrasound-Assisted Extraction on Antioxidant Properties of Extract from Jiaogulan (Gynostemma Pentaphyllum) Leaves”. Journal of Food Technology, Siam University 16, no. 2 (June 5, 2021): 95–108. Accessed March 29, 2024. https://li01.tci-thaijo.org/index.php/JFTSU/article/view/248386.