Method for separation of potato proteins from phenolic and/or gl y co alkaloid compounds

A method for the separation of potato proteins from one or more 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, one or more first salts and phenolic and/or glycoalkaloid compounds;
• (ii) subjecting said potato fruit juice or the derivative thereof 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 filtration process to a second cross-flow membrane filtration process wherein at least a portion of the salts present therein migrate across the membrane into a second permeate and the phenolic and/or glycoalkaloid compounds are retained in a second retentate.