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http://dx.doi.org/10.3746/jkfn.2017.46.2.185

Nutritional and Functional Properties of Water Extracts from Achyranthes japonica Nakai-Rice Pilsner Byproducts  

Oh, So-Hyeong (Department of Food Science and Technology, Sunchon National University)
Jeong, Beom-Gyun (Department of Food Science and Technology, Sunchon National University)
Chun, Jiyeon (Department of Food Science and Technology, Sunchon National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.46, no.2, 2017 , pp. 185-195 More about this Journal
Abstract
Two byproducts, brewer's spent grain (BSG; germinated rice and malt) and brewer's spent material (BSM; Achyranthes japonica Nakai), were collected during the manufacture of pilsner beer using A. japonica Nakai and germinated rice. Water extracts of BSG and BSM were prepared at different temperatures ($25^{\circ}C$, $60^{\circ}C$, and $100^{\circ}C$) for 5 h, and their nutritional and functional properties were investigated. ${\gamma}-Aminobutyric$ acid (GABA), saponin, and niacin contents were higher in extracts prepared at $60^{\circ}C$ for more than 3 h than the other extracts, whereas total polyphenol content, DPPH radical scavenging activity, and reducing power were higher in samples extracted at $100^{\circ}C$ for 1 h compared to the other ones. Overall, water extraction at $60^{\circ}C$ for 3 h was desirable to effectively collect both nutritional and functional components from BSG and BSM. Under these conditions, BSM extracts showed 4~18 times high niacin and folate contents, 1.4 times high total phenolic content, and 11~60 times high antioxidant activities compared to BSG extracts. This study shows that pilsner beer byproducts would be good sources of health beneficial components, especially GABA, saponin, water soluble vitamins, and polyphenolics.
Keywords
Achyranthes japonica Nakai; pilsner; brewer's spent grain; aqueous extraction; functional components;
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