Method for obtaining sinapic acid and/or a salt of sinapic acid from a native material mixture comprising the following steps: - step A): providing a native material mixture of seeds having hard frangible husks, in particular of seeds/fruits of crucifers (Brassicaceae), in particular of oil seed rape fruits as material mixture from the complete seeds or from previously (partially) deoiled seeds, in particular as press cake which remains when oil is pressed off, in particular using a press, as residue of obtaining oil; - step B): if the material mixture of step A is not yet comminuted: comminuting the material mixture, wherein, optionally, the husks are broken open; - step C): dispersing the comminuted material mixture of step A) or B) with water, wherein, to one part of comminuted material mixture, 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 are added, and wherein the water and the comminuted material mixture are agitated such that a free-flowing pulp or a dispersion results; - step D): setting the pH of the pulp from step C) to an alkaline range pH > 9.5; - step E): adding a water-soluble organic solvent, preferably ethanol, in particular in water-diluted form, to the pulp from step D) subsequently to the setting of the pH of the pulp in step D; in particular in such a manner that an alcohol concentration is achieved which is less than 30%, in order to detach the husks from the endosperm of the seeds/fruits; - step F): separating off a solids phase which may have the predominant fraction of the husks, preferably in a centrifuge in the centrifugal field; - step G): shifting the pH of the pulp which is optionally freed from husks from step F) to the pH range from pH = 4.5 to pH = 7.2; and - step H): separating the husk-free pulp, the pH 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 said phases is a polyphenol-albumin liquid phase; - step I): isolating sinapic acid and/or a salt of sinapic acid from the husk-free pulp of step F) or G) or from the polyphenol-albumin liquid phase of step H) directly or after it passes through further intermediate steps, by an extraction with an extraction medium. - step A): providing a native material mixture of seeds having hard frangible husks, in particular of seeds/fruits of crucifers (Brassicaceae), in particular of oil seed rape fruits as material mixture from the complete seeds or from previously (partially) deoiled seeds, in particular as press cake which remains when oil is pressed off, in particular using a press, as residue of obtaining oil; - step B): if the material mixture of step A is not yet comminuted: comminuting the material mixture, wherein, optionally, the husks are broken open; - step C): dispersing the comminuted material mixture of step A) or B) with water, wherein, to one part of comminuted material mixture, 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 are added, and wherein the water and the comminuted material mixture are agitated such that a free-flowing pulp or a dispersion results; - step D): setting the pH of the pulp from step C) to an alkaline range pH > 9.5; - step E): adding a water-soluble organic solvent, preferably ethanol, in particular in water-diluted form, to the pulp from step D) subsequently to the setting of the pH of the pulp in step D; in particular in such a manner that an alcohol concentration is achieved which is less than 30%, in order to detach the husks from the endosperm of the seeds/fruits; - step F): separating off a solids phase which may have the predominant fraction of the husks, preferably in a centrifuge in the centrifugal field; - step G): shifting the pH of the pulp which is optionally freed from husks from step F) to the pH range from pH = 4.5 to pH = 7.2; and - step H): separating the husk-free pulp, the pH 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 said phases is a polyphenol-albumin liquid phase; - step I): isolating sinapic acid and/or a salt of sinapic acid from the husk-free pulp of step F) or G) or from the polyphenol-albumin liquid phase of step H) directly or after it passes through further intermediate steps, by an extraction with an extraction medium.