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- W1966657249 abstract "We describe a approach for the synthesis of a mixture of 3,4-epoxybutyl (1-->3)-beta-D-oligoglucosides. The particular (1-->3)-beta-D-glucan isolated from the cell walls of Saccharomyces cerevisiae was recovered from the aqueous medium as water-insoluble particles by the spray drying (GS) method, and it was characterized by FTIR spectroscopy. The acid-solubilized (1-->3)-beta-D-oligoglucosides were prepared by partial acid hydrolysis of glucan particles, which were qualitatively analyzed by fluorophore-assisted carbohydrate electrophoresis (FACE). The peracetylated 3-butenyl (1-->3)-beta-D-oligoglucosides were synthesized by treating peracetylated (1-->3)-beta-D-oligoglucosides with the 3-butenyl alcohols and a Lewis acid (SnCl4) catalyst. Epoxidation of the peracetylated 3-butenyl oligoglucosides took place with m-chloroperoxybenzoic acid (m-CPBA). NaOMe in dry methanol was used for the deacetylation of the blocked derivatives, to give the 3,4-epoxybutyl (1-->3)-beta-D-oligoglucoside mixture in an overall yield of 21%. The sample was analyzed by positive-ion electrospray ionization mass spectrometry (ESIMS). In a 3,4-epoxybutyl (1-->3)-beta-D-oligoglucoside-binding (1-->3)-beta-D-glucanase assay, we found that the (1-->3)-beta-D-glucanase was obviously inactivated by the 3,4-epoxybutyl (1-->3)-beta-D-oligoglucosides. At the same time, we found the 3,4-epoxybutyl (1-->3)-beta-D-oligoglucoside mixture was more active as compared to the underivatized oligoglucoside mixture in eliciting phytoalexin accumulation in tobacco cotyledon tissue. Furthermore, it could be kept for a longer time than a (1-->3)-beta-D-oligoglucoside mixture, which indicated it is much more stable than (1-->3)-beta-D-oligoglucosides." @default.
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- W1966657249 date "2004-06-01" @default.
- W1966657249 modified "2023-09-27" @default.
- W1966657249 title "Synthesis, (1→3)-β-D-glucanase-binding ability, and phytoalexin-elicitor activity of a mixture of 3,4-epoxybutyl (1→3)-β-D-oligoglucosides" @default.
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- W1966657249 doi "https://doi.org/10.1016/j.carres.2004.03.008" @default.
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