Optimization of Ultrasonic-assisted Extraction of Total Phenolic Compound from Leaves of Chromolaena Odorata L. Using Response Surface MethodologyGuntima Sirijeerachai, Suphattra Khunasinkun, Piyapassara Boonleau, Ratchadaporn Oonsivilai and Aroonsri NuchitprasitchaiMATEC Web Conf., 333 (2021) 06005DOI: https://doi.org/10.1051/matecconf/202133306005