Abstract
Fourier-transform infrared (F.t.-i.r.) difference-spectra have been recorded, relative to a water-soluble dextran of low degree of branching, for ( a) dextrans from Leuconostoc mesenteroides NRRL B-742 (the L fraction) and NRRL B-1149 (the A fraction), ( b) d-glucans from Streptococcus mutans KR-1 and OMA 176, and ( c) the controls of amylose, cellulose, nigeran, and pseudonigeran. Confirmation has been obtained for the presence, in the spectra of the relatively insoluble dextrans and d-glucans, of a previously recognized, characteristic absorbance at 822 cm −1, and the correlation of this band with contiguous, linearly (1 → 3)-linked, α- d-glucopyranosyl residues, to which polymer insolubility (and cariogenic properties) has been ascribed. This analytical method allows the mole percent of the contiguously linked 3-mono- O-substituted α- d-glucopyranosyl residues to be quickly and non-destructively established in solid-state samples, when employing weights of polysaccharides in the microgram range. The wavenumbers and intensities of other bands observed in the F.t.-i.r. difference-spectra of d-glucans containing (1→4)- d-linkages are also discussed.
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