Abstract: The present invention concerns a method for separation of (a) potato proteins and insoluble fibers from (b) first salts and phenolic and/or glycoalkaloid compounds in potato fruit juice or a derivative thereof, said method comprising the steps of: (i) providing a potato fruit juice or a derivative thereof, comprising potato proteins; and insoluble fibers; and one or more first salts; and phenolic and/or glycoalkaloid compounds; (ii) subjecting the potato fruit juice or the derivative thereof to a first cross-flow membrane filtration process resulting in a first retentate and a first permeate; and (iii) adding aqueous diafiltration liquid containing one or more salts to the first retentate and performing a second cross-flow membrane filtration as diafiltration, to create a second permeate containing at least a portion of said phenolic and/or glycoalkaloid compounds and salts and a second retentate comprising potato proteins, salts and insoluble fibers.

Abstract: The invention concerns a method for the separation of potato proteins from one or more first salts and phenolic and/or glycoalkaloid compounds in potato fruit juice, said method comprising the steps of: (i) providing a potato fruit juice comprising potato proteins, one or more first salts and phenolic and/or glycoalkaloid compounds; (ii) subjecting said potato fruit juice to a first cross-flow membrane filtration process wherein at least a portion of the first salts and at least a portion of the phenolic and/or glycoalkaloid compounds migrate across the membrane into a first permeate and the potato proteins are retained in a first retentate; (iii) adding one or more second salts and water to the first retentate, while continuing the membrane filtration process, to create a diafiltrate containing at least a portion of said phenolic and/or glycoalkaloid compounds and the added second salts and a retentate; and (iv) subjecting the first permeate and/or said diafiltrate from said first cross-flow membrane filtra