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For recovering potato protein from the wastewater by foam separation, Weijenberg and Mulder (1978) investigated the gasâliquid interfacial adsorption of the protein in the liquid phase as a function of potato protein concentration, temperature, pH and sodium chloride addition.
For delicate food items which might be crushed by the vacuum packing process (such as potato chips), an alternative is to replace the interior gas with nitrogen. This has the same effect of inhibiting deterioration due to the removal of oxygen.