Title
Extraction of bioactive compounds from cob and pericarp of purple corn (Zea mays L.) by sequential extraction in fixed bed extractor using supercritical CO<inf>2</inf>, ethanol, and water as solvents
Date Issued
01 January 2016
Access level
metadata only access
Resource Type
journal article
Author(s)
University of Campinas
Publisher(s)
Elsevier
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 °C and 400 bar in a sequential extraction process using supercritical carbon dioxide (scCO2) 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 scCO2 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.
Start page
250
End page
259
Volume
107
Language
English
OCDE Knowledge area
Alimentos y bebidas
Química analítica
Subjects
Scopus EID
2-s2.0-84944145507
Source
Journal of Supercritical Fluids
ISSN of the container
08968446
Sponsor(s)
The authors thank CNPq for the scholarship awarded to Yaneth Machaca Monroy, and São Paulo Research Foundation FAPESP (Process number 2012/51317-1 ) for their financial support.
Conselho Nacional de Desenvolvimento Científico e Tecnológico CNPq
Sources of information:
Directorio de Producción Científica
Scopus