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Teores de isoflavonas em grãos inteiros e nos componentes dos grãos de diferentes cultivares de soja (Glycine max (L.) Merrill) Isoflavone contents of whole soybeans and their components, obtained from different cultivars (Glycine max (L.) Merrill)

By Carlos Eduardo da Silva, Mercedes Concórdia Carrão-Panizzi, José Marcos Gontijo Mandarino, Rodrigo Santos Leite and Ana Paula do Amaral Mônaco

Abstract

Devido à maior concentração de isoflavonas nos hipocótilos dos grãos de soja, a indústria de alimentos tem utilizado esse componente do grão como matéria-prima. No presente trabalho, foram quantificados os teores de isoflavonas nas estruturas formadoras do grão de soja (hipocótilo, cotilédones e casca), analisadas por Cromatografia Líquida de Alta Eficiência (CLAE). Foram avaliadas quatro cultivares de sojas especiais: BRS 184, BRS 216, BRS 257 e BRS 267, desenvolvidas pela Embrapa Soja. Todas as cultivares apresentaram maior teor de isoflavonas totais no hipocótilo (média de 2029,32 mg.100 g-1). No grão inteiro (267,16 mg.100 g-1) e nos cotilédones (209,16 mg.100 g-1), os teores de isoflavonas foram cerca de dez vezes menores do que nos hipocótilos. A cultivar BRS 216 apresentou o teor maior de isoflavonas totais no hipocótilo (2583,20 mg.100 g-1). Embora a casca da soja não apresente isoflavonas, observou-se que esses compostos estavam presentes nessa parte do grão numa quantidade média de 105,58 mg.100 g-1, devido à presença de resíduos do hipocótilo e dos cotilédones provenientes do processo de descasque. Essa composição residual da casca favorece sua utilização como matéria-prima fonte de fibras, porque também fornece isoflavonas e outros compostos da soja.<br>Due to the higher concentration of isoflavones in the soybean hypocotyls, the food industry has used this component of the bean as a raw material. This paper reports the isoflavone contents found in the different parts of the bean (hypocotyl, cotyledon and hull) as analyzed by High Performance Liquid Chromatography (HPLC). Four special soybean cultivars, BRS 184, BRS 216, BRS 257 and BRS 267, developed by Embrapa Soybean, were evaluated. All the cultivars presented higher contents of total isoflavones in the hypocotyls (average of 2029.32 mg.100 g-1). The isoflavone contents of the whole beans (267.16 mg.100 g-1) and the cotyledons (209.16 mg.100 g-1) were about 10 times lower than that of the hypocotyls. Cultivar BRS 216 presented the highest total isoflavone content in the hypocotyl (2583.20 mg.100 g-1). Although soybean hulls do not contain isoflavones, an average of 105.57 mg.100 g-1 was found in this component, due to the presence of hypocotyl and cotyledon residues resulting from the hulling process. This residual composition of the hulls favors their use as a raw material that is a source of fibers, also providing isoflavones and other soybean compounds

Topics: Cultivares de soja especiais, Isoflavonas, Agliconas, CLAE, Special soybean cultivars, Isoflavones, Aglycones, HPLC, Nutrition. Foods and food supply, TX341-641, Home economics, TX1-1110, Technology, T, DOAJ:Nutrition and Food Sciences, DOAJ:Agriculture and Food Sciences
Publisher: Instituto de Tecnologia de Alimentos (ITAL)
Year: 2012
OAI identifier: oai:doaj.org/article:500492bc01ad410cba0a42b191c2e0c2
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