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- Title
Engineered Polysaccharides: α‐1,3‐Glucan Acetates Showing Upper Critical Solution Temperature in Organic Solvents.
- Authors
Heinze, Thomas; Pfeifer, Annett; Koschella, Andreas; Adelman, Douglas; Howe, Laurie; Behabtu, Natnael; Lenges, Christian
- Abstract
Acetates of α‐1,3‐glucan dissolved in N,N‐dimethyl acetamide/LiCl are prepared by converting the polysaccharide with acetyl chloride, acetic acid anhydride/pyridine, or with acetic acid/N,N′‐carbonyl diimidazole. Values of the degree of substitution for the acetyl groups (DSAc) of up to 2.6 are realized. NMR spectroscopic measurements reveal a preferred conversion of the primary hydroxyl group at position 6 followed by positions 2 and 4. Depending on the DSAc, the samples may be soluble in solvents of different polarity at room temperature or at elevated temperatures showing upper critical solution temperature at DS of about 2.5. This process is found to be reversible.
- Subjects
CRITICAL temperature; ORGANIC solvents; POLYSACCHARIDES; ACETYL chloride; ACETYL group; BETA-glucans; ACETAMIDE
- Publication
Macromolecular Chemistry & Physics, 2019, Vol 220, Issue 16, pN.PAG
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201900112