Extraction of alkylresorcinols from wheat bran with supercritical CO2

•Supercritical fluid extraction of wheat bran at different extraction conditions has been carried out.•Increasing extraction temperature will increase the amount of extract.•Increasing extraction temperature will increase the alkylresorcinol content and the antioxidant capacity.•The approximate math...

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Bibliographic Details
Published in:Journal of food engineering 2013-12, Vol.119 (4), p.814-821
Main Authors: Rebolleda, Sara, Beltrán, Sagrario, Sanz, M. Teresa, González-Sanjosé, María Luisa, Solaesa, Ángela García
Format: Article
Language:English
Subjects:
Alkylresorcinols
Approximation
Carbon dioxide
Fatty acids
Lipids
Mathematical models
Particle size
Solvent extraction
Sovová’s model
Supercritical fluid extraction
Wheat
Wheat bran
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Summary:•Supercritical fluid extraction of wheat bran at different extraction conditions has been carried out.•Increasing extraction temperature will increase the amount of extract.•Increasing extraction temperature will increase the alkylresorcinol content and the antioxidant capacity.•The approximate mathematical model of Sovová was applied to describe the extraction curves. The supercritical fluid extraction (SFE) of wheat bran alkylresorcinols has been studied. Extractions were carried out at 40.0MPa. The effect of particle size, static extraction pretreatment with supercritical CO2 (SC-CO2) and extraction temperature on the extraction kinetics was investigated. The extraction yield increased as the particle size decreased and with temperature. Extraction curves present a faster and linear initial extraction period followed by a slower extraction period. Based on these results the approximate mathematical model of Sovová was successfully applied to describe the extraction curves. The total content of alkylresorcinols was determined and compared with the alkylresorcinol content obtained by conventional organic solvent extraction. Due to the amphiphilic nature of these resorcinolic lipids, the extraction yield was higher for polar organic solvents than for SC-CO2. Characterization of supercritical extracts was also performed by determining the fatty acid composition and antioxidant activity.
ISSN:0260-8774
1873-5770
DOI:10.1016/j.jfoodeng.2013.07.008