10.22376/ijpbs.2019.10.1.p1-12 Volume 2 Issue 4 2011 (October - December) This work presents the phenolic quantification and evaluation of lessThan i greaterThan in vitro lessThan /i greaterThan antioxidant activity of lessThan i greaterThan A. dolichocarpa lessThan /i greaterThan and lessThan i greaterThan D. chrysocarpa lessThan /i greaterThan are the two species of the Annonaceae family. The total phenolics content of the plant extracts was determined by the Folin-Ciocalteu method. Antioxidant activities were evaluated by using DPPH radical scavenging and β-carotene-linoleic acid bleaching and compared with ascorbic acid, BHA and BHT used as reference compounds. The most significant total phenolic content was of 252.50 ± 7.02 mg of gallic acid equivalent/g for CHCl lessThan sub greaterThan 3 lessThan /sub greaterThan extract from lessThan i greaterThan A. dolichocarpa lessThan /i greaterThan , which presented the best antioxidant activity (IC lessThan sub greaterThan 50 lessThan /sub greaterThan 55.64 ± 5.24 µg/ml) for DPPH scavenging. For lessThan i greaterThan D. chrysocarpa lessThan /i greaterThan , the more significant total phenolic content was of 213.11 ± 9.87 for AcOEt extract, with IC lessThan sub greaterThan 50 lessThan /sub greaterThan value of 26.97 ± 1.90 µg/ml for DPPH scavenging. BHT was the most effective antioxidant. The results obtained show that phenolic compounds contribute to the antioxidant activity of the extracts. Further studies will be conducted to isolate the chemical constituents responsible for antioxidant activity. Jackson Roberto Guedes Da Silva Almeida, Marianna Ribeiro De Oliveira, Amanda Leite Guimarães, Ana Paula De Oliveira, Luciano Augusto De Araújo Ribeiro, Ana Sílvia Suassuna Carneiro Lúcio And Luci Phenolic quantification, antioxidant activity, Anaxagorea dolichocarpa, Duguetia chrysocarpa, Annonaceae 367-374