Polysaccharide vibrational Raman optical activity: laminarin and pullulan

Bell, A. F., Hecht, L. and Barron, L. D. (1995) Polysaccharide vibrational Raman optical activity: laminarin and pullulan. Journal of Raman Spectroscopy, 26(12), pp. 1071-1074. (doi: 10.1002/jrs.1250261209)

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The backscattered Raman optical activity (ROA) spectra of the β(1-3)-linked polysaccharide laminarin, and its dimer repeating unit D-laminarihiose, together with those of the predominantly α(l-4)-linked polysaccharide pullulan, and its trimer repeating unit D-maltotriose, between 350 and 1500 cm−1 in aqueous solution are reported and discussed. Several differences are evident between the ROA spectra of laminarin and D-laminaribiose which are ascribed to triple helix formation in the polysaccharide. In particular, the signs of four ROA signals between ca. 1050 and 1150 cm−1 are reversed and two ROA signals assigned to vibrations involving the glycosidic link observed at ca. 445 and 1431 cm−1 change sign and increase in intensity, respectively. In contrast, pullulan, which adopts a random coil-type structure in aqueous solution, generates an ROA spectrum that closely resembles that of D-maltotriose.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hecht, Dr Lutz and Barron, Professor Laurence
Authors: Bell, A. F., Hecht, L., and Barron, L. D.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of Raman Spectroscopy
ISSN (Online):1097-4555

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