Length dependency of flux and protein permeation in crossflow microfiltration of skimmed milk |
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Authors: | A Piry W Kühnl T Grein A Tolkach S Ripperger U Kulozik |
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Institution: | 1. Technische Universität München, Chair for Food Process Engineering and Dairy Technology, Weihenstephaner Berg 1, 85354 Freising-Weihenstephan, Germany;2. Technische Universität Kaiserslautern, Chair of Particle Process Engineering, Gottlieb-Daimler-Straβe, 67663 Kaiserslautern, Germany |
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Abstract: | Crossflow microfiltration of skimmed milk to fractionate casein micelles and whey protein was investigated regarding length dependency of flux and whey protein permeation using a 1.2 m long, 0.1 μm tubular ceramic membrane. A special module consisting of four sections was constructed allowing to assess the effects of membrane length online by measuring flux and permeation of the whey protein β-lactoglobulin as a function of local processing conditions. It was found that under the applied filtration parameters (mean transmembrane pressure ΔpTM,m = 0.5 bar; temperature ? = 55 °C; wall shear stress τw = 115 Pa) main parts of the membrane were controlled by a deposit layer. In consequence, the transmission of the whey protein β-lactoglobulin increases from 38% to 87% from membrane inlet to membrane outlet. Results show that a local optimum for protein fractionation exists regarding membrane resistance and process conditions. |
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Keywords: | Length dependency Microfiltration Fractionation Milk proteins Ceramic membranes |
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