Vacuum-ultraviolet circular dichroism of acetylated glucans

✍ Scribed by Arthur J. Stipanovic; E. S. Stevens

• Publisher: Wiley (John Wiley & Sons)
• Year: 1981
• Tongue: English
• Weight: 334 KB
• Volume: 20
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1981.360200608

✦ Synopsis

Abstract

We have measured the solution and film vacuum ultraviolet circular dichroism of a series of acetylated glucans containing α‐ and β‐(1→3), (1→4), and (1→6) linkages. In addition to the 210‐nm band studied previously, we observe the entire π‐π* band near 190 nm; these bands are negative for all triacetates regardless of configuration and conformation. A band near 170 nm shows configurational sensitivity for (1→3)‐ and (1→6)‐linked polysaccharides. The band is positive for both (1→4)‐linked triacetates, but when cellulose triacetate is partially deacetylated, the 170‐nm band becomes negative, thus making the correlation complete. The positive 170‐nm band in cellulose triacetate films is more than an order of magnitude more intense than in any other case and, further, is accompanied by an equally large negative band near 153 nm, raising the possibility that the dichroism in the triacetate arises from strong excitonic interactions which are disrupted upon partial deacetylation.