title: Single and two-component cation-exchange adsorption of the two pure major whey proteins.
abstract: Adsorption of pure alpha-lactalbumin (ALA) and beta-lactoglobulin (BLG) to the cation exchanger SP Sepharose FF was studied at pH 3.7 with the purpose of developing a process for isolating them from whey. Measurement of Langmuir parameters describing adsorption equilibrium in batch experiments and protein breakthrough time values in 1-ml packed-beds at a linear velocity of 158 cm/h and initial concentrations of 3 mg/ml for BLG and 1.5 mg/ml for ALA suggested the feasibility of using this adsorbent to separate the two proteins when present in a mixture. Subsequent experiments with 5-ml columns at the above concentrations and a linear velocity of 30 cm/h confirmed this and showed evidence of competitive adsorption as ALA displaced and eluted all BLG from the column in a pure form, and the remaining ALA could be eluted thereafter at high purity and with 91% recovery.
authors.affiliation: Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK. mmhae2@cam.ac.uk
authors.forename: Mayyada M H
authors.initials: MM
authors.lastname: El-Sayed
authors.forename: Howard A
authors.initials: HA
authors.lastname: Chase
mesh_terms: D000327:Adsorption; D002138:Calibration; D002412:Cations; D002850:Chromatography, Gel; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D007768:Lactalbumin / Q000302:isolation & purification*; D007782:Lactoglobulins / Q000302:isolation & purification*; D008894:Milk Proteins / Q000302:isolation & purification*; D012044:Regression Analysis; D013696:Temperature; D000067816:Whey Proteins
chemical_list: D002412:Cations; D007782:Lactoglobulins; D008894:Milk Proteins; D000067816:Whey Proteins; D007768:Lactalbumin