Dietary Fibre Content in Lupine (Lupinus albus L.) and Soya (Glycine max L.) Seeds

Abstract

The objective of this study was to determine the concentrations of total dietary fibre (TDF), insoluble dietary fibre (IDF) and soluble dietary fibre (SDF) in the samples of whole or dehulled seeds of Lupinus albus (L.) and Glycine max (L.), and to assess the effect of dehulling on the concentrations obtained. The results showed a higher content of TDF and IDF and a lower content of SDF in lupine seeds compared to soybeans. Lupine seed dehulling resulted in a lower content of TDF (P < 0.05) and IDF (P < 0.05), and a higher content of SDF. Following soybean dehulling, the increase of SDF (P < 0.05) and decrease of IDF but no effect on TDF was reported. The proportion of IDF (90.4 vs. 96.0%) and SDF (9.6 vs. 4.0%) in TDF changed only slightly following lupine seed dehulling, whereas in soybeans, the proportion of IDF markedly decreased (91.8 vs. 73.0%), and SDF increased (8.2 vs. 27.0%). The effectiveness of dehulling with regard to soluble fibre was higher in soybeans compared to lupine seeds. In lupine, dehulling did not show any significant increase of nutritional value concerning the proportion of insoluble fibre in cotyledon. Due to the content of insoluble fibre in lupine seeds, their proportion in the ration of animals should be considered.