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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Extraction of bioactive compounds from cob and pericarp of purple corn (Zea mays L.) by sequential extraction in fixed bed extractor using supercritical CO2, ethanol, and water as solvents

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Author(s):
Monroy, Yaneth M. [1] ; Rodrigues, Rodney A. F. [2] ; Sartoratto, Adilson [2] ; Cabral, Fernando A. [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, UNICAMP, Dept Food Engn, BR-13083862 Campinas, SP - Brazil
[2] Univ Estadual Campinas, UNICAMP, Chem Biol & Agr Pluridisciplinary Res Ctr CPQBA, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF SUPERCRITICAL FLUIDS; v. 107, p. 250-259, JAN 2016.
Web of Science Citations: 18
Abstract

Purple corn (Zea mays L.) is traditionally used in Peru in the preparation of desserts and juices. Purple corn cob and kernel extracts have intense color and are rich in anthocyanins and phenolic compounds. Purple corn cob, whole grain, ground grain, and pericarp extracts were obtained by supercritical fluid technology in a fixed bed at 50 degrees C and 400 bar in a sequential extraction process using supercritical carbon dioxide (scCO(2)) as a solvent in the first step, ethanol in a second step, and water in a third step, in order to determine the composition of the extracts. The curves from the initial extraction kinetics of each raw material were used to determine the best overall yield and extraction time. The two matrices with higher yield (cob and pericarp) were selected and triplicate extraction curves of these matrices were performed in a predetermined period of time. Each point of the extraction curve was chemically analyzed, except the extract from the scCO(2) extraction, due to its low yield. The extracts were characterized for yield, total monomeric anthocyanins by differential pH, total phenolics, total flavonoids, major anthocyanins by HPLC, and antioxidant activity by DPPH. Color measurements of the purple corn pericarp extracts were performed by the CIEL{*} a{*} b{*} system. Overall, the aqueous extraction presented the best overall mass yield, higher yield of the components monitored analytically, and higher antioxidant activity, while the ethanol extracts were more concentrated only in anthocyanins. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/51317-1 - Development of products and processes with supercritical technology: construction of one multipurpose unit to obtain extracts of industrial interest.
Grantee:Fernando Antonio Cabral
Support Opportunities: Regular Research Grants