RETENTION OF SOME FLAVONES AND FLAVANONES IN FLOUR, GRAIN AND BRAN OF SORGHUM DURING STORAGE
DOI:
https://doi.org/10.18512/1980-6477/rbms.v17n3p522-534Keywords:
Sorghum bicolor (L.) Moech, storage losses, bioactive compounds, flavonoids retentionAbstract
ABSTRACT - Sorghum is associated with several functional benefits because it contains high levels of phenolic compounds, such as the flavonoids, flavones and flavanones. However, these compounds are sensitive to the period and conditions of storage. Thus, this work aimed to evaluate luteolin, apigenin, naringenin and eriodictyol retention in the sorghum genotypes SC319 (flour and grain) and TX430 (flour and bran) stored for 180 days at 4, 25 and 40 °C. These compounds were quantified by a high-performance liquid chromatograph equipped with a diode array detector. There was effect of the storage time, which favored the flavone and flavanone reduction in the evaluated genotypes. The storage temperature influenced the flavones more than the flavanone contents. The retentions ranged from 70.27 to 88.72% for luteolin, 69.04 to 99.15% for apigenin, 56.92 to 88.51% for naringenin and from 77.10 to 93.42% for eriodictyol at the three temperatures at the end of 180 days. Although flavones and flavanones were better preserved at 4 °C (about 88% of retention), at room temperature (25 °C) flavones and flavanones retentions were at least 77% and 85% after 180 days.
Keywords: Sorghum bicolor (L.) Moench, storage losses, bioactive compounds, flavonoids retention.
RETENÇÃO DE ALGUMAS FLAVONAS E FLAVANONAS EM FARINHA DE SORGO, GRÃO E FARELO DURANTE O ARMAZENAMENTO
RESUMO – O sorgo está associado a várias propriedades funcionais pelo fato de conter altos níveis de compostos fenólicos, como flavonoides, flavonas e flavanonas. No entanto, estes compostos são sensíveis ao período e condições de armazenamento. Assim, este trabalho teve como objetivo avaliar a retenção de luteolina, apigenina, naringenina e eriodictilol nos genótipos de sorgo SC319 (farinha e grão) e TX430 (farinha e farelo) armazenados por 180 dias a 4, 25 e 40 °C. Estes compostos foram quantificados por cromatografia líquida de alto desempenho acoplada a detector de arranjo de diodos. Houve efeito do tempo de armazenamento, que favoreceu a redução de flavona e flavanona nos genótipos avaliados. A temperatura de armazenamento influenciou as flavonas mais do que o conteúdo de flavanona. As retenções variaram de 70,27 a 88,72% para luteolina, 69,04 a 99,15% para apigenina, 56,92 a 88,51% para naringenina e de 77,10 a 93,42% para eriodictilol nas três temperaturas no final de 180 dias. Embora as flavonas e flavanonas tenham sido melhor conservadas a 4 °C (cerca de 88% de retenção), em temperatura ambiente (25 °C), as retenções de flavonas e flavanonas foram pelo menos 77% e 85% após 180 dias.
Palavras-chave: Sorghum bicolor (L.) Moench, perdas durante o armazenamento, compostos bioativos, retenção de flavonoides.
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