title: Microfiltration: Effect of retentate protein concentration on limiting flux and serum protein removal with 4-mm-channel ceramic microfiltration membranes.
abstract: The objective of our study was to determine if the limiting flux and serum protein (SP) removal were different at 8, 9, or 10% true protein (TP) in the microfiltration (MF) retentate recirculation loop using 0.1-µm ceramic graded permeability membranes with 4-mm-channel diameters operated at 50 °C using a diluted milk protein concentrate with 85% protein on a total solids basis (MPC85) as the MF feed. The limiting flux for the MF of diluted MPC85 was determined at 3 TP concentrations in the recirculation loop (8, 9, and 10%). The experiment was replicated 3 times for a total of 9 runs. On the morning of each run, MPC85 was diluted with reverse osmosis water to an MF feed TP concentration of 5.4%. In all runs, the starting flux was 55 kg/m(2) per hour, the flux was increased in steps until the limiting flux was reached. The minimum flux increase was 10 kg/m(2) per hour. The limiting flux decreased as TP concentration in the recirculation loop increased. The limiting flux was 154 ± 0.3, 133 ± 0.7, and 117 ± 3.3 kg/m(2) per hour at recirculation loop TP concentrations of 8.2 ± 0.07, 9.2 ± 0.04, and 10.2 ± 0.09%, respectively. No effect of recirculation loop TP concentration on the SP removal factor was detected. However, the SP removal factor decreased from 0.80 ± 0.02 to 0.75 ± 0.02 as flux was increased from the starting flux of 55 kg/m(2) per hour to the limiting flux, with a similar decrease seen at all recirculation loop TP concentrations.
authors: Northeast Dairy Foods Research Center, Department of Food Science, Cornell University, Ithaca, NY 14853.
authors: E E
authors: EE
authors: Hurt
authors: Northeast Dairy Foods Research Center, Department of Food Science, Cornell University, Ithaca, NY 14853.
authors: M C
authors: MC
authors: Adams
authors: Northeast Dairy Foods Research Center, Department of Food Science, Cornell University, Ithaca, NY 14853. Electronic address: dmb37@cornell.edu.
authors: D M
authors: DM
authors: Barbano
mesh_terms: D000818:Animals; D001798:Blood Proteins / Q000032:analysis*; D002516:Ceramics / Q000737:chemistry*; D005374:Filtration; D005511:Food Handling / Q000379:methods*; D008892:Milk / Q000737:chemistry; D008894:Milk Proteins / Q000737:chemistry; D010539:Permeability
chemical_list: D001798:Blood Proteins; D008894:Milk Proteins
keywords: limiting flux; microfiltration; serum protein removal