Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/2033
Título: A novel application of microwave-assisted extraction of polyphenols from brewer’s spent grain with HPLC-DAD-MS analysis
Autor: Moreira, Manuela M.
Morais, Simone
Barros, Aquiles A.
Delerue-Matos, Cristina
Guido, Luís F.
Palavras-chave: Brewer’s spent grain
Polyphenols
Ferulic acid
Microwave-assisted extraction
HPLC-DAD-MS analysis
Data: 2012
Editora: Springer
Relatório da Série N.º: Analytical and Bioanalytical Chemistry; Vol. 403, Issue 4
Resumo: This paper reports a novel application of microwave-assisted extraction (MAE) of polyphenols from brewer’s spent grains (BSG). A 24 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 °C extraction temperature, 20 mL of solvent, and maximum stirring speed. Under these conditions, the yield of ferulic acid was 1.31±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-DADMS 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.
Peer review: yes
URI: http://hdl.handle.net/10400.22/2033
ISSN: 1618-2642
Versão do Editor: http://link.springer.com/article/10.1007%2Fs00216-011-5703-y
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