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Zhang, Lei; Wang, Xue; Hu, Yang; Abiola Fakayode, Olugbenga; Ma, Haile; Zhou, Cunshan; Hu, Zhenyuan; Xia, Aiming; Li, Qun
Ultrasonics sonochemistry, 12/2021, Letnik: 80Journal Article
•Dual-frequency multi-angle ultrasound was used for processing of raw soymilk.•Monitored ultrasonic field intensity of 40 + 20 kHz 0° treatment was the largest.•The 40 + 20 kHz 45° treatment maximally increased soybean protein content.•Flavor of soymilk was improved by dual-frequency multi-angle ultrasonic treatment. To improve the soybean protein content (SPC), flavor and quality of soymilk, the effects of dual-frequency ultrasound at different angles (40 + 20 kHz 0°, 40 + 20 kHz 30°, 40 + 20 kHz 45°) on physicochemical properties and soybean protein (SP) structure of raw soymilk were mainly studied and compared with the conventional single-frequency (40 kHz, 20 kHz) ultrasound. Furthermore, the intensity of the ultrasonic field in real-time was monitored via the oscilloscope and spectrum analyzer. The results showed that 40 + 20 kHz 45° treatment significantly increased SPC. The ultrasonic field intensity of 40 + 20 kHz 0° treatment was the largest (8.727 × 104 W/m2) and its distribution was the most uniform. The emulsifying stability of SP reached the peak value (233.80 min), and SP also had the largest particle size and excellent thermal stability. The protein solubility of 40 + 20 kHz 30° treatment attained peak value of 87.09%. 20 kHz treatment significantly affected the flavor of okara. The whiteness and brightness of raw soymilk treated with 40 kHz were the highest and the system was stable. Hence, the action mode of ultrasonic technology can be deeply explored and the feasibility for improving the quality of soymilk can be achieved.
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