期刊
JOURNAL OF MEMBRANE SCIENCE
卷 405, 期 -, 页码 284-290出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2012.03.027
关键词
Amaranth starch; Microfiltration; Al-Hakkak process
资金
- Biopolymer Network Ltd. (New Zealand)
The research reported here investigated microfiltration as an alternative to density-based processes for separating amaranth starch-milk produced by the pilot-scale Al-Hakkak process into a starch-rich concentrate and an aqueous stream containing the soluble proteins and carbohydrates. A Millipore ProFlux M12 Tangential Filtration System, fitted with a 1000 kDa regenerated cellulose membrane, was used as the experimental apparatus. The selected membrane retained all the starch granules, but also retained more protein than desired (protein retention was 67% and the starch-rich concentrate had a dry-basis protein content of 12%). Analysis of the feed liquor, and diafiltered concentrate, revealed the presence of some non-starch insoluble material. This material, which may have been protein-based, was present in the starch-milk produced using the pilot-scale method but not the laboratory-scale method, and its presence determined the final protein content of the diafiltered concentrate. The optimal transmembrane pressure was approximately 100-150 kPa, above which flux increased non-linearly with pressure. However, the flux-pressure relationship was weak, suggesting that higher operating pressures may be sustainable. (C) 2012 Elsevier B.V. All rights reserved.
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