AO, K. INVESTIGATION OF ANTIOXIDANT ACTIVITY (IN VITRO) AND GAS CHROMATOGRAPHY-MASS SPECTROMETRY PROFILING OF PORTULACA OLERACEA L. AND PORTULACA GRANDIFLORA HOOK. EXTRACTS. Asian Journal of Pharmaceutical and Clinical Research, v. 12, n. 3, p. 348-352, 15 Feb. 2019.