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.
Highlights
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
The content of total dietary fibre (TDF), insoluble dietary fibre (IDF) and soluble dietary fibre (SDF) was determined in the samples of whole or dehulled seeds of Lupinus albus (L.) and Glycine max (L.) using enzymatic and gravimetric methods based on the AOAC (1997) procedure with TDF-100A (Sigma) kit
Summary
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. The increase of SDF (P < 0.05) and decrease of IDF but no effect on TDF was reported. The effectiveness of dehulling with regard to soluble fibre was higher in soybeans compared to lupine seeds. Celluloses and lignin bind only little water and are termed insoluble fibre (Stratil 1993; Trowell 1974; Kalač and Míka 1997). Soluble dietary fibre with its ability of water absorption has a laxative effect which leads to the prevention of constipation and diverticular disease.
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