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Published on: April 12, 2019
Optimizing ultrasound-assisted forward osmosis for concentrating blueberry juice: Effects on process efficiency,
Peiyi Wang1, Haoqi Chu2, Jian Wang3
1College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, People's Republic of China; Key Laboratory of Food Macromolecular Resources Processing Technology Research, (Zhejiang University of Technology), China National Light Industry, People's Republic of China; School of Food and Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China.
Abstract:
The forward osmosis (FO) process is known for its low energy consumption during juice concentration. This study explores the effects of ultrasonic frequency, power, and irradiation mode on concentration efficiency, membrane performance, and polyphenol retention in the FO process. The results demonstrate that the optimal conditions for ultrasound-assisted concentration (80 kHz, 240 W, and 6-s intervals) effectively balanced the trade-off between water flux enhancement and reverse salt flux leakage. Under optimal conditions, the anthocyanins in the juice were well preserved, with total anthocyanin and total phenolics increasing by 22.7 % and 25.7 %, respectively. Ultrasound also enhanced the stability of the juice by modifying its particle size distribution. Additionally, the results indicated that the molecular weight and carbon skeleton structure of phenolics significantly influence their retention. These findings highlight the potential of ultrasound-assisted FO as a novel and scalable method for high-quality juice concentration, effectively balancing process efficiency and product quality.
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