Journal
FOOD CHEMISTRY
Volume 239, Issue -, Pages 385-401Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.06.130
Keywords
Agricultural and agro-industrial waste; Alkaline hydrolysis; Antioxidant capacity; Bioactive compounds; HPLC-DAD
Funding
- Coordination for Higher Education Staff Development (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior, Capes, Brazil) by the Social Demand Program (DS, Brazil)
- National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, CNPq, Brazil)
- CAPES [11/2009]
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Brewer's spent grain (BSG) could be tested as an alternative source of polyphenols in animal nutrition. Proper extraction and analytical methods are critical for quantification. Thus, extraction for BSG, corn silage, and brans of rice, corn, and wheat were studied for the highest yield of polyphenols. A method for 18 phenolic monomers by HPLC-DAD was developed, validated, and applied to samples. An aqueous solution of NaOH (0.75% w/v) using integral samples for extraction resulted in the highest values for colorimetric measurements in all analyzed sources. Method by maceration showed the highest phenolic yield when applied in corn silage and BSG. However, for brans the best method was microwave assisted. Results from HPLC-DAD analysis clearly showed that native structures of phenolic compounds were simplified to its monomers allowing quantification and sample discrimination. BSG had the highest concentration of polyphenols and could be a promising and innovative source for animal feed studies. (C) 2017 Elsevier Ltd. All rights reserved.
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