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13C NMR study on peracetylated derivatives of cyclomaltoheptaose (β-cyclodextrin, β-CD) and its methylated derivative

✍ Scribed by Yasuyuki Tezuka; Irwan Hermawan

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
463 KB
Volume
260
Category
Article
ISSN
0008-6215

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✦ Synopsis

Peracetylated samples of cycbmaltoheptaose

Qkyclodextrin, /?-CD) and its methylated derivative were studied by 13C NMR. The acetyl carbonyl carbon signal in peracetylated @-CD was resolved into a triplet, and the three peaks were assigned by long-range C-H COSY and INAPT techniques. The individual carbonyl peak was found to be indicative of the location of the acetyl group on the 2, 3, and 6 position in the glucose residues. An acetylated derivative of a partly methylated &CD was also subjected to 13C NMR analysis to determine the distribution of aeetyl and, subsequently, methyl groups on the glucose residues. * Corresponding author. ' Part 8 of a series: 13C-NMR Structural Studies on Cellulose and Polysaccharide Derivatives with Carbonyl Groups as a Sensitive Probe. For part 7, see ref. 9.

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