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Forward osmosis concentration of high viscous polysaccharides of Dendrobium officinale: Process optimisation and membrane fouling analysis |
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| Authors: | Ming Cai Huazhao Zhong Haoqi Chu Hua Zhu Peilong Sun Xiaojun Liao |
| Affiliation: | 1. Department of Food Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014 China;2. Department of Food Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014 China
Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology), China National Light Industry, Hangzhou, Zhejiang, 310014 China Contribution: Data curation (equal), ?Investigation (equal), Methodology (equal), Writing - original draft (equal);3. Department of Food Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014 China Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology), China National Light Industry, Hangzhou, Zhejiang, 310014 China Contribution: Data curation (equal), Validation (equal);4. Department of Food Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014 China Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology), China National Light Industry, Hangzhou, Zhejiang, 310014 China Contribution: Formal analysis (equal), Methodology (equal);5. Department of Food Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014 China Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology), China National Light Industry, Hangzhou, Zhejiang, 310014 China Contribution: Writing - review & editing (equal);6. Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083 China |
| Abstract: | Polysaccharides of Dendrobium officinale (DOP) need to be dehydrated and concentrated after extraction for further application. They are usually concentrated by thermal evaporation which consumes great energy. However, high viscosity of DOP makes the concentration more difficult even using non-thermal membrane technologies such as nanofiltration (NF) or reverse osmosis (RO). In this study, effects of process conditions, such as membrane orientations, draw solutions and their concentrations, and flowrate on forward osmosis (FO) concentration of viscous DOP were studied. Active layer to feed solution mode, cross flowrate at 240 mL min?1, and draw solution of 3 m NaCl have been found as the optimal conditions. Foulants on the membrane surface with loose structure could be easily cleaned and removed by hydraulic flushing. DOP concentrated by FO achieved almost 1.3 times at the same time compared with that in NF and RO. DOP could be further concentrated for 1.5 folds at longtime without significant decrease in water flux. In addition, slight reverse solutes in FO process could reduce the viscosity of high viscous DOP, which was good for concentration. Accordingly, FO is a potential technology for concentration of high viscous polysaccharides such as DOP. |
| Keywords: | Concentration forward osmosis membrane fouling viscous polysaccharides |