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Thambiraj, Solomon Rajesh; Phillips, Michael; Koyyalamudi, Sundar Rao; Reddy, Narsimha
Food chemistry, 11/2018, Letnik: 267Journal Article
•Polysaccharides have been extracted from the seeds of Lupinus luteus (yellow lupin).•Yellow lupin polysaccharides displayed a range of biological activities.•Lupin polysaccharides have potential for functional/nutraceutical applications.•Structural characterisation carried out by FT-IR and NMR. Yellow lupin polysaccharides (YLP-1, YLP-2 and YLP-3) were isolated from the whole seeds of Lupinus luteus L. Their antioxidant activities were evaluated by ABTS+ and hydroxyl radical scavenging, and Fe2+ chelating assays. Immunostimulatory activities were measured by their ability to activate macrophages to produce TNF-α and NO. Four strains of probiotic bacteria were used to measure their prebiotic activities. YLP-2 with largest galactose content displayed the best activity amongst the three isolated polysaccharides. NMR and FT-IR spectroscopic methods have revealed that YLPs contain galactans and galactomannans which are linked with β-(1,4) glycosidic bond in the main chain. The side chain Galp unit of galactomannan is connected to the main chain Manp by α-(1,6) linkage. The results presented in this paper strongly suggest that YLPs display significant antioxidant, immunostimulatory and prebiotic activities and hence hold great potential as nutraceutical and functional agents.
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