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- W2060165254 abstract "Abstract It had been established by methylation-structural analysis that dextran fraction S from Leuconostoc mesenteroides NRRL B-1355 has two types of α- d -glucopyranosyl residues that are linked through O-3, i.e. , 35% of the residues carry a (1→3)-bond, and ∼10% carry a (1→6)-bond in addition to a (1→3)-bond. Two similarly constituted dextrans have now been identified by methylation-structural analysis, namely, the S-type fractions from L. mesenteroides strains NRRL B-1498 and B-1501. The S-type fractions from L. mesenteroides strains B-1355, B-1498, and B-1501 are structurally differentiated from the α- d -glucans (characteristically insoluble) of certain cariogenic Streptococci which also contain both 3- O - and 3,6-di- O -substituted α- d -glucopyranosyl residues. 13 C-N.m.r. spectra have been recorded at 90° for both the S- and L-type fractions of strains B-1355, b-1498, and B-1501. The L-type fractions have a low degree of branching through 3,6-di- O -substituted α d -glucopyranosyl residues, but no 3-mono- O -substituted residues. (Dextran fraction S of Streptococcus 5000 g.l.c. instrument equipped with hydrogen-flame detectors. On-column injection of glass columns (2 mm i.d. x 1.23 m) was employed for all such chromatography. The 13 C-n.m.r. conditions and methods for preparation of dextran samples have been described(su4). In general, a Varian XL-100-15 spectrometer equipped with a Nicolet TT-100 system was employed in the Fourier-transform mode. Chemical shifts are expressed in p.p.m. relative to external tetramethylsilane, but were actually calculated by reference to the lock signal." @default.
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- W2060165254 date "1979-09-01" @default.
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- W2060165254 title "Structural analysis of leuconostoc dextrans containing 3-O-α-d-glucosylated α-d-glucosyl residues in both linear-chain and branch-point positions, or only in branch-point positions, by methylation and by 13C-N.M.R. spectroscopy" @default.
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- W2060165254 doi "https://doi.org/10.1016/s0008-6215(00)84764-3" @default.
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