Abstract
Black soybean hull was subjected to steam explosion (SE) treatment under different conditions to improve the yield and properties of soluble dietary fiber (SDF) extract. Optimal conditions for SE treatment were found to be moisture content of 15%, pressure level of 1.0 MPa, and treatment time of 80 s. Under these conditions, the yield of SDF increased from 10.20% to 17.49%. In addition, structural and functional properties of SDF from untreated and SE-treated black soybean hull were investigated. Soluble dietary fiber extracted from SE-treated hull exhibited lower molecular weight and improved functional properties, such as cholesterol-binding capacity, when compared to SDF extracted from untreated soybean hull. In addition, SDF extracted from SE-treated black soybean hull showed a rough surface structure, while a smooth surface structure was found for SDF extracted from the untreated hull. The obtained results indicate that SE treatment can be successfully used to enhance the yield and the property of yolk cholesterol absorption of SDF adsorption of yolk cholesterol functional properties of SDF from black soybean hull.
Highlights
Black soybean is an economic crop in China, with an estimated average cultivation area of 13,333.33 square kilometers and a total production of 220,000 tons [1]
At pressure levels higher than 1.0 MPa, the extraction ratio decreased. is increase in extraction ratio may be attributed to the fact that pressure destroyed the tissue structure of black soybean hull and made it easy for soluble dietary fiber (SDF) to dissolve out [28]
SDF was effectively extracted from black soybean hulls after steam explosion (SE) treatment
Summary
Black soybean is an economic crop in China, with an estimated average cultivation area of 13,333.33 square kilometers and a total production of 220,000 tons [1]. By-products of black soybean processing, is usually used as animal feed and is rich in nutrients and bioactive compounds such as proteins, polysaccharides, pigments, and polyphenols [2,3,4,5]. Anthocyanins of black soybean hull showed antioxidant and antidiabetic effects in rats [6]. Bioactive compounds in black soybean hull received more attention from researchers and scientists. Black soybean hull beverage was prepared, and its free radical scavenging ability was measured [7]. Studies performed on extracts of functional soluble dietary fiber (SDF) from black soybean hull are limited
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