Abstract
Ultrasound-assisted extraction (UAE) was used to obtain arabinoxylan (AX) from brewers’ spent grain (BSG) with a higher yield, altered structural characteristics, and improved techno-functional properties. Results showed that an UAE procedure working at 400 W for 15 min under a 60% duty cycle could increase the AX yield by 52.41% compared with a traditional alkaline extraction without sonication. Concomitantly, UAE-AX developed a degraded Mw of 2741 kDa, a changed conformation of less molecular asymmetry and a decreased mean particle size from 12.56 to 4.993 μm. The rheological properties of UAE-AX aqueous solution were improved, leading to higher viscosity and gel-forming capacity of the AX stabilized emulsions. As a result, UAE-AX addition could reduce the mean droplet size to 6.40 μm and better stabilize the emulsion under various conditions than traditional alkaline extracted AX. Thus, the results proved UAE to be a promising method for extracting AX with increased emulsifying capacity from BSG.
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Acknowledgments
The authors thank the scholarships and financial support and School of Food Science and Engineering of South China University of Technology for supplying the equipment.
Funding
This work was supported by the Science and Technology Project of Guangdong Province (2018A050506008), the National Natural Science Foundation of China (Nos. 31972062 and 32001675), the 111 Project (B17018), and State Key Laboratory of Applied Microbiology Southern China (SKLAM010-2021).
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LL: Conceptualization, Methodology, Writing–original draft, Data curation. MC: Formal analysis, Methodology. TEC: Writing − review and editing. HY: Data curation, Software. HZ: Project supervision and advice.
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Liu, L., Chen, M., Coldea, T.E. et al. Emulsifying properties of arabinoxylans derived from brewers’ spent grain by ultrasound-assisted extraction: structural and functional properties correlation. Cellulose 30, 359–372 (2023). https://doi.org/10.1007/s10570-022-04912-z
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DOI: https://doi.org/10.1007/s10570-022-04912-z