Please use this identifier to cite or link to this item:
|Title:||Hydro-ethanolic mixtures for the recovery of Phenols from Mediterranean plant materials||Authors:||Tsakona, Sofia
Galanakis, Charis M.
|Keywords:||Phenols;Antioxidants;Leaves;Olive;Oranges;Sage;Beverages;Ethanol;Forestry;Drinking water||Category:||Biological Sciences||Field:||Natural Sciences||Issue Date:||May-2012||Publisher:||Springer||Source:||Food and Bioprocess Technology, Volume 5, Issue 4, May 2012, Pages 1384-1393||Journal:||Food and Bioprocess Technology||Abstract:||The optimization of phenol extraction in hydro-ethanolic mixtures was investigated by using dried samples of aromatic plants (Salvia fruticosa and Origanum dictamnus L.) and fruit-bearing tree leaves (Olea europaeae L. and Citrus sinensis L.) as substrates. Four extraction conditions were studied by monitoring the phenolic content and the antioxidant efficacy of the extracts. Temperature and time were the primary factors affecting the extraction yield, while their increase to 60 °C and 8 h, respectively, resulted in enhanced phenols recovery. Extraction equilibrium was obtained for all the determinations only in the case of dictamnus after 4 h. The sample/solvent ratio seem to affect conversely the phenol content and antioxidant efficacy (AE) yield, as the higher total phenols concentrations were followed by lower AE values. The ethanol content affected also the process, but the impact on yield was rather important (and negative) only by using absolute ethanol. Sage was the most phenol rich substrate with a maximum yield of 73. 3 mg total phenols/g and AE value of 30. 6 mg 2,2-diphenyl-1-picrylhydrazyl (DPPH)/g, which were obtained by using the conditions of 40 °C, 8 h, 40 g sample/L, and 70 mL ethanol/100 mL. Dictamnus, olive, and orange tree leaves followed with maximum yields of 43. 9, 43. 3, and 12. 2 mg total phenols/g as well as 16. 1, 19. 3, and 1. 2 mg DPPH/g, respectively (obtained with 40 °C, 2 h, 40 g/L, 70 mL/100 mL, 40 °C, 8 h, 40 g/L, 70 mL/100 mL, and 60 °C, 2 h, 40 g/L, 70 mL/100 mL, respectively). The aromatic plants extracts were proposed as additives in order to produce potable drinks with similar AE to established beverages, after a simple dilution with water||URI:||http://ktisis.cut.ac.cy/handle/10488/6317||ISSN:||19355130||DOI:||10.1007/s11947-010-0419-0||Rights:||© 2010 Springer Science + Business Media, LLC||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
Show full item record
checked on Dec 18, 2018
WEB OF SCIENCETM
checked on Mar 31, 2020
Page view(s) 5096
checked on Apr 2, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.