期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 403, 期 4, 页码 1019-1029出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-011-5703-y
关键词
Brewer's spent grain; Polyphenols; Ferulic acid; Microwave-assisted extraction; HPLC-DAD-MS analysis
资金
- Fundacao para a Ciencia e a Tecnologia (FCT) [PEst-C/EQB/LA0006/2011, SFRH/BD/60577/2009]
- UNICER - Bebidas de Portugal
- Fundação para a Ciência e a Tecnologia [SFRH/BD/60577/2009] Funding Source: FCT
This paper reports a novel application of microwave-assisted extraction (MAE) of polyphenols from brewer's spent grains (BSG). A 2(4) orthogonal composite design was used to obtain the optimal conditions of MAE. The influence of the MAE operational parameters (extraction time, temperature, solvent volume and stirring speed) on the extraction yield of ferulic acid was investigated through response surface methodology. The results showed that the optimal conditions were 15 min extraction time, 100 A degrees C extraction temperature, 20 mL of solvent, and maximum stirring speed. Under these conditions, the yield of ferulic acid was 1.31 A +/- 0.04% (w/w), which was fivefold higher than that obtained with conventional solid-liquid extraction techniques. The developed new extraction method considerably reduces extraction time, energy and solvent consumption, while generating fewer wastes. HPLC-DAD-MS analysis indicated that other hydroxycinnamic acids and several ferulic acid dehydrodimers, as well as one dehydrotrimer were also present, confirming that BSG is a valuable source of antioxidant compounds.
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