Abstract: The feed mixture, from which a required substance is to be isolated, is introduced centrally into a chamber unit rotating about its axis and having two non-miscible phases flowing through it in countercurrent. Monitors responding to the substance are disposed at the two ends of the chamber unit and continuously detect the concentration of the substance and signal the measurements to a control system. By way of various valves and pumps this system controls the flow ratio of the two phases in such a manner that the concentration of the substance at one end of the unit, with respect to the corresponding concentration at the other end of the unit, remains within very low predetermined limits (e.g. 1%), so that practically the entire substance can be removed as an eluate with one of the two phases at the other end of the chamber unit (FIG. 1).

Abstract: Foodstuff and fodder additives are made by linking essential aminoacids to carbohydrates or other assimilable polyhydroxy compounds in such a way that the aminoacid is liberated in the digestive tract.