Este estudo objetivou quantificar as reservas de proteínas solúveis e aminoácidos livres em sementes e em cotilédones, raízes, epicótilos e folhas de plântulas de cupuaçuzeiro (Theobroma grandiflorum (Willd. ex.Spreng.) Schum.). As amostragens de sementes foram realizadas após o despolpamento, assim como antes e depois de expô-las a 16 * 2ºC e 65 + 2 % UR, por 48, 72, 240 e 480 horas, e a 21 +2ºC e 45 + 2 % UR, por 48 e 72 horas; e das partes estruturais das plântulas aos 30, 45 e 90 dias após a semeadura. Conclui-se que: a) a desidratação de sementes de cupuaçuzeiro provoca redução nos teores médios de proteínas solúveis e aumento nos de aminoácidos livres; b) as proteínas solúveis, com 23,6 % do total de peso seco da biomassa, são as maiores fontes de reservas nas sementes de cupuaçuzeiro, enquanto os aminoácidos livres representam apenas 1 % desse total; c) aos 30 e 90 dias após a semeadura, os cotilédones são os principais locais de reservas de proteínas solúveis e aminoácidos livres.The objective of this study was to determine the reserves of soluble proteins and free amino acids in seeds, cotyledons, roosts, epicotyls and leaves of “cupuaçu” (Theobroma grandiflorum (Willd. ex. Spreng.) Schum.) seedlings. The samplings of seeds were made immediately after the pulping; before and after exposure of the seeds to 16 + 2ºC and 65 + 2 % RH for 48, 72, 240 and 480 hours and to 21 + 2 ºC and 45 + 2 % RH, for 48 and 72 hours. Sampling of structural parts of the seedlings was made 30, 45 and 90 days after sowing. It was concluded that: a) the dehydration of “cupuaçu” seeds cause reductions in the average of soluble proteins and increases of free amino acids; b) the soluble proteins, with 23,6 % of the total dry weight, are the largest sources of reserves in the “cupuaçu” seeds, while the free amino acids represented only 1 % of the dry matter of plant; c) the cotyledons are the main sites of soluble proteins and free amino acids reserves 30 and 90 days after sowing.