Abstract: A method for converting grains (B), containing at least starch, bran (D), germ (G) and proteins (L), includes a washing (3), a grinding (2), a first (4) and second (5) hydrolysis through enzymes, a fermentation (6) through yeasts and distillation (7) of grains (B) to obtain alcohol (E) and a liquid. The method (1) provides: to subject grains (B) to solid fraction separation (8), by separating bran (D) before the fermentation (6); to subject to fermentation (6) grains (B) deprived of bran (D); to subject distillation (7) grains (B), deprived of bran (D) and fermented, so obtaining alcohol (E) and a aqueous liquid (F) nearly without solid residues.

Abstract: A method for converting germ (G) provides: to subject germ (G) to a first hydrolysis (2) for converting starch associated to germ (G) in dextrins (D); downstream the first hydrolysis (2), to subject germ (G) to a first separation (3), obtaining a fraction containing dextrin (D) and a first portion of oil (H) and proteins (L) associated to germ (G), separated from the latter purifying it; to subject the purified germ (G) to grinding (4); to subject the ground germ (G) to a second hydrolysis (5) for hydrolyzing the proteins (L) of germ (G); downstream the second hydrolysis (5), to subject germ (G) to a second separation (6) obtaining a fraction containing bran (C), peptides and not hydrolyzed proteins which are separated from the remaining part of germ (G) consisting of a mixture containing amino acids (A) and a second portion of oils (H); to subject the mixture containing oils (H) and amino acids (A) to a third separation (7) getting a solution of amino acids (A) separated from the remaining part of ge