Title
Extraction of purple corn (Zea mays L.) cob pigments and phenolic compounds using food-friendly solvents
Date Issued
01 March 2018
Access level
metadata only access
Resource Type
journal article
Author(s)
The Ohio State University
Publisher(s)
Academic Press
Abstract
Purple corn cob (PCC) is an economic anthocyanin-rich source that could serve as food colorant. Pigment extraction from PCC using mild solvent can be difficult because PCC have hard texture and complex matrix. Due to toxicity concerns, most acidified aqueous organic solvents that produce high anthocyanin recovery from PCC are not desirable for food applications. In this study a consumer-friendly solvent (aqueous ethanol) was used at different ethanol ratios (0–100%) to determine PCC anthocyanin recovery as compared to methanol and 70% (v/v) aqueous acetone. Different acidity levels (0–2% 6 N HCl, v/v) were also investigated to see if the PCC pigment extraction yield could be improved by adjusting solvent acidity. The PCC extract obtained by water-ethanol ratio around 1:1 (40%–60% ethanol) achieved highest yield of monomeric anthocyanins (>13.5 mg/g FW) with low polymeric color, comparable to 70% acetone (14.3 mg/g FW). The amount of PCC monomeric anthocyanin and phenolics recovery extracted with different water-ethanol combination could be predicted using quadratic models (R2 = 0.94 and 0.95). The solvent acidity seemed to impacted water PCC extraction but not much in 70% acetone extraction. This study provides valuable reference information to extract pigments from PCC for potential food application, as synthetic red dye alternatives.
Start page
87
End page
93
Volume
80
Language
English
OCDE Knowledge area
Nutrición, Dietética
Subjects
Scopus EID
2-s2.0-85041713940
Source
Journal of Cereal Science
ISSN of the container
07335210
Sponsor(s)
This work was partially funded by China Sponsorship Council . The authors would also like to acknowledge Agroindustrial S.A.C (Lima, Peru) and Globenatural International S.A. (Chorrillos-Lima, Peru) for providing purple corn cob samples for this study.
Sources of information:
Directorio de Producción Científica
Scopus