Pedagogy and Propaganda

Bruyn, Frans De; Marshall, Gail; Hoenselaars, Ton

doi:10.1017/9781316460795.012

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“…For the R and β anomers of this residue, the signals for C-3′′ were shifted downfield by 0.35 ppm as compared with the corresponding proton signal of free xylose (δ 3.42). 38 This indicated that the nonreducing xylopyranoside is 3-substituted. The position of this linkage was unambiguously assigned by acetylation analysis as described below.…”

Section: Resultsmentioning

confidence: 99%

“…The reducing xylose residue was substituted at O-3; H-3 was deshielded relative to the corresponding proton in free xylose on comparison with the literature (0.19 ppm). 38 The hydroxyl groups at 1′, 2′, and 5′ of arabinose are substituted based upon the insignificant 1 H-NMR signal shifts that occurred upon peracetylation of 2 to 2a. The xylose moiety was substituted at position-3 as indicated by the lower-field shift of xylose protons except for that at C-3 upon peracetylation.…”

Section: Resultsmentioning

confidence: 99%

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Structures of Ferulic Acid Glycoside Esters in Corn Hulls

Hosny

Rosazza

1997

J. Nat. Prod.

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1D-NMR (1H and 13C) and 2D-NMR spectroscopy as well as chemical means have been used to determine the structures of three new feruloylated disaccharides derived from acid hydrolysis of corn hulls. The structures of these oligosaccharides were determined to be O-(2‘-O-trans-feruloyl-α-l-arabinofuranosyl)-(1→3)-β−d-xylopyranose, O-[2‘-O-methoxyl-5‘-O-(E)-feruloyl]-α-l-arabinofuranosyl-(1→3)-β-d-xylopyranose, and O-[2‘-O-methoxyl-5‘-O-(Z)-feruloyl]-α-l-arabinofuranosyl-(1→3)-d-β-xylopyranose.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%