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A fibra alimentar é composta por celulose, hemiceluloses, gomas, pectinas e mucilagens sendo classificada em solúvel e insolúvel, quanto a sua solubilidade em água. As beta-glicanas são componentes da fibra alimentar solúvel presentes na aveia e sua importância é devido às propriedades funcionais e aos efeitos hipocolesterolêmicos e hipoglicêmicos apresentados. O presente trabalho tem como objetivo avaliar os teores de fibra alimentar solúvel, insolúvel e total e de beta-glicanas de cultivares de aveia recomendados pela Comissão Brasileira de Pesquisa de Aveia. Grãos de aveia (Avena sativa, L) foram descascados, as cariopses moídas e as amostras acondicionadas e armazenadas à temperatura de -20° C. Para a análise de fibra alimentar foi adotada a metodologia da AOAC (1997). Entre os cultivares analisados, UPF 7, UPF 13, UPF 14 e UPF 16 apresentaram os maiores teores de fibra alimentar insolúvel. Os maiores teores de fibra alimentar solúvel foram verificados nos cultivares UFRGS 7, CTC 13, UPF 16 e CTC 2. O cultivar UPF 16 apresentou o maior teor de fibra alimentar total, seguido de UFRGS 7, CTC 13 e UFRGS 18. Para a determinação de beta-glicanas foi adotada a metodologia da AOAC (1997). Os maiores teores de beta-glicanas foram verificados nos cultivares UFRGS 7, UPF 14 e UFRGS 18. The dietary fiber is composed by cellulose, hemi-celluloses, gums, pectins, and mucilages, being classified as soluble or insoluble depending on its solubility in water. Beta-glucans are a fraction of the soluble dietary fiber, being important due to its functional properties and effects in reducing cholesterol and glucose. This work aimed at evaluating the levels of soluble, insoluble, and total dietary fiber, as well as the amount of beta-glucans, present in grains of oat cultivars recommended by the Brazilian Commission for Oat Research. Oat grains were hulled, the caryopses were ground and the samples packaged and stored at temperature of -20ºC. The dietary fiber analysis used the AOAC (1997). Among the analyzed cultivars, UPF 7, UPF 13, UPF 14 and UPF 16 had the highest levels of insoluble fiber, while UFRGS 7, CTC 13, UPF 16, and CTC 2 had more soluble fiber. The cultivar UPF 16 presented the highest level of total fiber, followed by UFRGS 7, CTC 13, and UFRGS 18. The amount of beta-glucans determined by the AOAC (1997) was higher for UFRGS 7, UPF 14, and UFRGS 18 than for the other cultivars

Avaliação dos teores de fibra alimentar e de beta-glicanas em cultivares de aveia (Avena sativa L)