Emulsifying properties of arabinoxylans derived from brewers' spent grain by ultrasound-assisted extraction: structural and functional properties correlation

摘要

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 mu m. 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 mu m 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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