Comparison of Physicochemical Properties of Β-Glucans Extracted from Hull-Less Barley Bran by Different Methods.
International Journal of Biological Macromolecules(2021)
Abstract
In this study, four extraction methods, including ultrasonic extraction (UE), hot water extraction (HWE), microwave extraction (ME), and microwave-assisted ultrasonic extraction (MUE) were utilized to extract beta-glucan from hull-less barley bran. Extraction yields and physicochemical properties of beta-glucans extracted by different methods were investigated. The MUE displayed a highest extraction yield (2.16%) within shorter extraction time. Besides, beta-glucans extracted by MUE (MUE-G) had higher number-average molecular weight (M-n) (3.415 x 10(5)), whereas beta-glucans extracted by UE (UE-G) showed lower M-n (2.257 x 10(5)) as compared to other methods. Accordingly, apparent viscosity of MUE-G was highest, while water solubility index of UE-G was highest (34.18-88.81%) at tested temperature ranges (25-95 degrees C). The MUE-G shower stronger foam stability and emulsifying properties and weaker foaming capability, while UE-G exhibited stronger foaming capability. The foaming capability and emulsifying properties of beta-glucan products were better in neutral solutions (pH = 7) than in the acidic (pH = 4) and alkaline (pH = 9). (c) 2021 Elsevier B.V. All rights reserved.
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Key words
Hull-less barley,beta-Glucan extraction,Physicochemical properties
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