A process for isolating lactoferrin from milk or a casein-containing
component or product containing lactoferrin, comprising subjecting a
precipitate of casein obtained from the milk of the casein-containing
component or product, with which precipitate at least part of the milk
lactoferrin is associated, to a treatment with an extraction medium
whereby at least part of the lactoferrin associated with the precipitate
of casein is released to the medium. When lactoferrin has been released,
the medium may be subjected to different types of purification operation
steps. The purification operations are selected in accordance with the
purity requirements of the intended specific application. Furthermore,
lactoferrin and/or a composition comprising lactoferrin according to the
above-mentioned process is provided.