Hard Cap Espresso Machine Extraction of Polyphenolic Compounds from Pulses

Amira Melki, Yassine Mokaddem, Francesc A Esteve-Turrillas, Miguel de la Guardia

Abstract


A hard cap espresso machine was employed for the extraction of polyphenolic compounds from food samples as dry legumes and pulses. 100 mg of ground dry sample was mixed with a dispersing agent and placed in a refillable stainless steel capsule with a borosilicate filter. A complete polyphenol extraction was achieved by using 150 mL ethanol 50 % (v/v) in water and determined by Folin-Ciocalteu spectrophotometric method. The method provided a limit of detection of 0.4 mg g-1. The whole extraction procedure was achieved in less than one minute using the mild extraction conditions of 72°C and 19 bars given by the domestic machine. Fifteen varieties of food samples (3 lentils, 6 beans, 5 chickpeas, and 1 sorghum) were purchased in Spanish and Tunisian markets and analyzed by the proposed procedure. Obtained results were compared with those found by a reference extraction method based on ultrasound-assisted extraction, being statistically comparable. The content of polyphenolic compounds in the analyzed commercial samples varied from 4.6 to 5.5 mg g-1 for lentils, from 3.4 to 5.8 mg g-1 for beans, from 2.2 to 3.5 mg g-1 for chickpeas, and 3.0 mg g-1 for sorghum.

Keywords


Hard cap espresso extraction; polyphenols; pulses; Folin-Ciocalteu; ultrasound-assisted extraction

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DOI: http://dx.doi.org/10.29356/jmcs.v62i2.371

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Copyright (c) 2018 Amira Melki, Yassine Mokaddem, Francesc A Esteve-Turrillas, Miguel de la Guardia

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Journal of the Mexican Chemical Society (J. Mex. Chem. Soc.) Vol 62, No 2 (2018). Quarterly publication (April-June). Edited and distributed by Sociedad Química de México, A.C. Barranca del Muerto 26, Col. Crédito Constructor, Del. Benito Juárez, C.P. 03940, Mexico City. Phone: +5255 56626837; +5255 56626823 Contact: soquimex@sqm.org.mx http://www.sqm.org.mx Editor-in-Chief: Ignacio González-Martínez. Indexed Journal. Certificate of reserved rights for recurrent publications under digital distribution granted by the Instituto Nacional del Derecho de Autor (INDAUTOR): 04-2018-091118040000-203. Certificate of lawful title and content: Under procedure. ISSN-e granted by the Instituto Nacional del Derecho de Autor (INDAUTOR): 2594-0317. ISSN granted by the Instituto Nacional del Derecho de Autor (INDAUTOR): 1870-249X. Postal registration of printed matter deposited by editors or agents granted by SEPOMEX: IM09-0312 Copyright © Sociedad Química de México, A.C. Total or partial reproduction is prohibited without written permission of the right holder. The Figures/schemes quality and the general contents of this publication are full responsibility of the authors. Updated December 12th, 2018 by Adriana Vázquez (editorial assistant, e-mail: editor.jmcs@gmail.com), J. Mex. Chem. Soc., Sociedad Química de México, A.C.