Drying and storage of olive leaf extracts. Influence on polyphenols stability

[EN] There is an increasing demand for natural antioxidants in the food, cosmetics and pharmaceutical industries which has led to the search not only for natural extracts but also for strategies with which to increase long-term storage stability. The aim of this work was to assess the influence of the drying and storage of olive leaf extracts on the bioactive potential and stability of polyphenols. Olive leaves were hot air dried (120 degrees C) and freeze dried. Then the extracts were obtained by maceration (ethanol-water, 80:20, v/v). Afterwards, a part of the extracts was hot air dried at 120 degrees C and vacuum dehydrated at 55 degrees C. Thus, the extracts, in liquid and powder forms, were stored at 4, 25 and 35 degrees C for 4 weeks. During this period, the extracts were characterized by determining the antioxidant capacity (AC), the total phenolic content (TPC) and the concentration of the major phenolic compounds.The authors thank the Generalitat Valenciana (PROMETEOII/2014/005, PROMETEO/2012/007 and ACOMP/2013/93) for its financial support. M.H. Ahmad Qasem was the recipient of a fellowship from the Ministerio de Educacion, Cultura y Deporte of Spain (Programa de Formacion de Profesorado Universitario del Programa Nacional de Formacion de Recursos Humanos de Investigacion). This research has also been supported by the Ministerio de Ciencia e Innovacion (DPI2012-37466-C03-03, AGL2011-29857-C03-03 and AGL2015-67995-C3-1-R) and CIBERobn (CB12/03/30038, Fisiopatologia de la Obesidad y la Nutricion, CIBERobn, Instituto de Salud Carlos III).Ahmad-Qasem Mateo, MH.; Ahmad-Qasem, B.; Barrajon-Catalan, E.; Micol-Molina, V.; Carcel Carrión, JA.; García Pérez, JV. (2016). Drying and storage of olive leaf extracts. Influence on polyphenols stability. Industrial Crops and Products. 79:232-239. https://doi.org/10.1016/j.indcrop.2015.11.006S2322397