List of Articles DPPH• Open Access Article Abstract Page Full-Text 1 - Preliminary phytochemical screening for antioxidant activity and content of phenols and flavonoids of 18 species of plants native to western Ecuador Shirley Moncayo Xavier Cornejo Jhon Castillo Viviana Valdez 10.30495/tpr.2021.1922658.1196 20.1001.1.25883623.2021.5.2.5.6