_____________________________________________________________________________________________________ *Corresponding author: E-mail: khadydiose@yahoo.fr; Asian Journal of Research in Botany 2(4): 1-8, 2019; Article no.AJRIB.50878 Contribution to the Study of Leaves: Azadirachta indica A. Juss (Meliaceae): Evaluation of the Antioxidant Activity Kady Diatta 1* , William Diatta 1 , Alioune Dior Fall 1 , Serigne Ibra Mbacké Dieng 1 , Amadou Ibrahima Mbaye 1 , Apéli Adjoa Jennifer Akpoto-Kougblenou 1 and Emmanuel Bassène 1 1 Laboratory of Pharmacognosy and Botany, FMPO, UCAD, BP: 5005, Fann, Dakar, Sénégal. Authors’ contributions This work was carried out in collaboration among all authors. Author KD designed the study, performed the statistical analysis, wrote the protocol and wrote the first draft of the manuscript. Authors WD and ADF managed the analyses of the study. Authors SIMD, AIM, AAJAK performed the statistical analysis. Author EB managed the literature searches. All authors read and approved the final manuscript. Article Information Editor(s): (1) Dr. Magdalena Valsikova, Department of Vegetables Production, Faculty of Horticulture and Landscape, Slovak University of Agriculrure in Nitra (SUA), Slovakia. Reviewers: (1) K. Anbarasi, Nirmala College for Women, India. (2) Jacilene Silva, State University of Ceará, Brazil. (3) Ogundeko, Timothy Olugbenga, Bingham University, Nigeria. Complete Peer review History: http://www.sdiarticle3.com/review-history/50878 Received 13 June 2019 Accepted 20 August 2019 Published 26 August 2019 ABSTRACT In Africa, the use of plants for therapeutic purposes is an ancient practice. In recent years, much scientific work has been spent to the chemistry and toxicology of medicinal plants; there is a particular focus on natural antioxidants in relation to their various therapeutic properties. Therefore, the purpose of our study is to determine the antioxidant activity of aqueous and hydroethanol extracts from the leaves of Azadirachta indica A. Juss a plant known for its many pharmacological properties. The leaves of Azadirachta indica A. Juss were oven dried at 60 degrees for 24 hours and reduced to a fine powder. And, the powder is first extracted with distilled water to obtain the aqueous extract, then with a mixture of distilled water and ethanol 50/50 (v / v) to obtain the hydroethanol extract. Short Research Article