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Structure of the reducing end-groups in spruce xylan

✍ Scribed by Sven-Ingvar Andersson; Olof Samuelson; Mitsuro Ishihara; Kazumasa Shimizu

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 428 KB
Volume: 111
Category: Article
ISSN: 0008-6215
DOI: 10.1016/0008-6215(83)88312-8

No coin nor oath required. For personal study only.

✦ Synopsis

Borohydride reduction of spruce meal followed by mild hydrolysis with acid gave a large proportion of 4-0-(cc-D-galactopyranosyluronic acid)-D-xylitol. When the reduction was preceded by mild treatment with alkali, galactonic acid end-groups were formed. Enzymic degradation of holocellulose from reduced spruce-meal followed by ion-exchange chromatography led to the isolation of a tetrasaccharide having a xylitol end-group. Its structure revealed that the reducing end-group in spruce xylan has the structure /?-D-Xylp-(1+3)-a-L-Rhap-(1 +2)-a-D-GalpA-(l-4)-D-Xyl, which is the same as that in hardwood xylan.

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