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Type: Artigo
Title: Influence Of Ethanol, Water, And Their Mixtures As Co-solvents Of The Supercritical Carbon Dioxide In The Extraction Of Phenolics From Purple Corn Cob (zea Mays L.)
Author: Monroy
Yaneth M.; Rodrigues
Rodney A. F.; Sartoratto
Adilson; Cabral
Fernando A.
Abstract: Supercritical carbon dioxide (scCO(2)), ethanol (EtOH), and water are considered GRAS (Generally Recognized as Safe) solvents. They exhibit considerable advantages in the extraction of phenolic compounds with a wide range of polarities, such as the anthocyanins found in purple corn (Zea mays L.). To evaluate the effect of ethanol and water as co-solvents in the scCO(2) extraction of phenolic compounds of purple corn cobs, extracts were obtained at 400 bar and 50 degrees C using EtOH (CE), water (CW), and mixtures of EtOH/water 50% (CE50), and EtOH/water 70% (CE70) as co-solvents of scCO(2). The overall yield (X-0), the extraction yield of total monomeric anthocyanins (TMA), total phenolics (TP), total flavonoids (TF) were determined in the extracts, as well as the antioxidant activity (AA) expressed as EC50/DPPH, color, and presence of specific anthocyanins by HPLC. The lowest extraction yield (4.15%) was obtained when ethanol was used as co-solvent (CE), and the highest yield (24.4%) was observed when using a mixture of EtOH/water (70%, CE70) as co-solvent. The presence of EtOH and water was essential to obtain concentrated phenolic extracts, with values around 66 mg cyanidin-3-glycoside equivalent per gram of dried extract, 290 mg gallic acid equivalent per gram, and 117 mg catechin equivalent per gram, and antioxidant activity of CE50 =31 mu g/mL by DPPH. (C) 2016 Elsevier B.V. All rights reserved.
Subject: Phenolic Totals
Flavonoids Totals
Anthocyanins Monomeric Totals
Antioxidant Activity
Supercritical Extraction
Editor: Elsevier Science BV
Rights: fechado
Identifier DOI: 10.1016/j.supflu.2016.07.019
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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