ISSN:
0377-0486
Schlagwort(e):
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
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.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/jrs.1250261209
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