Method for obtaining a valuable material phase, in particular a valuable product from a native mixture of substances, comprising the following steps of: - step A: providing the native mixture of substances from seeds of cruciferous plants (Brassicaceae), having a proportion of hard, breakable hulls or in hulled form, in particular from rapeseed as a mixture of substances from the complete seeds or from seeds which have already been (partially) deoiled, in particular as a press cake which remains as a residue from oil extraction when oil is pressed off, in particular using a press; - step B: if the mixture of substances from step A has not yet been comminuted: comminution of the mixture of substances, wherein the hulls may optionally be broken up; - step C: dispersing and/or mixing the comminuted mixture of substances from step A) or B) with water, wherein preferably up to a maximum of 8, particularly preferably up to a maximum of 6, in particular up to a maximum of 5 parts of water is added to one part of comminuted mixture of substances, and wherein the water and the comminuted mixture of substances are stirred so that a flowable slurry or dispersion is obtained; - step D: adjusting the pH value of the slurry from step C) to an alkaline range pH value >9.5; - step E: adding a water-soluble organic solvent, preferably ethanol, in particular in a form diluted with water, to the slurry from step D) following the adjustment of the pH value of the slurry in step D; in particular in such a way that an alcohol concentration is achieved which is less than 30% in order to dissolve the hulls from the endosperm of the seeds/fruits; - step F: separation of a solid phase which comprises the majority of the hulls which may optionally still be present, preferably in a centrifuge in a centrifugal field; - step G: shifting the pH value of the pulp freed from the solid phase from step F) into the pH range from pH = 4.5 to pH = 7.2; and - step H: separating the hull-free pulp, the pH value of which has been shifted to the acidic range in step G), preferably in a centrifuge, in particular in at least one decanter or a separator, into a plurality of phases, wherein at least one of these phases is a sinapinic acid-containing phase; - step I: addition of laccase to the sinapinic acid-containing phase of step H) directly or after passing through further intermediate steps. - step A: providing the native mixture of substances from seeds of cruciferous plants (Brassicaceae), having a proportion of hard, breakable hulls or in hulled form, in particular from rapeseed as a mixture of substances from the complete seeds or from seeds which have already been (partially) deoiled, in particular as a press cake which remains as a residue from oil extraction when oil is pressed off, in particular using a press; - step B: if the mixture of substances from step A has not yet been comminuted: comminution of the mixture of substances, wherein the hulls may optionally be broken up; - step C: dispersing and/or mixing the comminuted mixture of substances from step A) or B) with water, wherein preferably up to a maximum of 8, particularly preferably up to a maximum of 6, in particular up to a maximum of 5 parts of water is added to one part of comminuted mixture of substances, and wherein the water and the comminuted mixture of substances are stirred so that a flowable slurry or dispersion is obtained; - step D: adjusting the pH value of the slurry from step C) to an alkaline range pH value >9.5; - step E: adding a water-soluble organic solvent, preferably ethanol, in particular in a form diluted with water, to the slurry from step D) following the adjustment of the pH value of the slurry in step D; in particular in such a way that an alcohol concentration is achieved which is less than 30% in order to dissolve the hulls from the endosperm of the seeds/fruits; - step F: separation of a solid phase which comprises the majority of the hulls which may optionally still be present, preferably in a centrifuge in a centrifugal field; - step G: shifting the pH value of the pulp freed from the solid phase from step F) into the pH range from pH = 4.5 to pH = 7.2; and - step H: separating the hull-free pulp, the pH value of which has been shifted to the acidic range in step G), preferably in a centrifuge, in particular in at least one decanter or a separator, into a plurality of phases, wherein at least one of these phases is a sinapinic acid-containing phase; - step I: addition of laccase to the sinapinic acid-containing phase of step H) directly or after passing through further intermediate steps.