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Starch Derivatives of High Degree of Functionalization 5. Stepwise Carboxymethylation of Amylose
Pfeiffer, K., Heinze, Th. and Lazik, W. Starch Derivatives of High Degree of Functionalization 5. Stepwise Carboxymethylation of Amylose Chemical Papers, Vol.56, No. 4, 2002, 261-266
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Attached Files |
| Name |
Description |
MIMEType |
Size |
Downloads |
n564a261.pdf
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564a261.pdf |
application/pdf |
169.41KB |
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| Author(s) |
Pfeiffer, K.
Heinze, Th.
Lazik, W.
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| Title |
Starch Derivatives of High Degree of Functionalization 5. Stepwise Carboxymethylation of Amylose
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| Journal name |
Chemical Papers
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| Publication date |
2002
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| Year available |
2002
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| Volume number |
56
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| Issue number |
4
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| ISSN |
0366-6352
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| Start page |
261
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| End page |
266
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2002
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| Language |
english
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| Subject |
290000 Engineering and Technology
290600 Chemical Engineering
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| Abstract/Summary |
The stepwise reaction of amylose with monochloroacetic acid carried out heterogeneously in methanol—water medium and sodium hydroxide gives carboxymethylamylose (CMA) with high degree of substitution (DS) up to 2.35. The stepwise increase of total DSCM of CMA decreases gradually with increasing DSCM of the starting polymer. For the determination of the functionalization pattern of the CMA both HPLC and 1H NMR spectroscopy after complete depolymerization were applied. These analyses revealed a statistical content of the different repeating units with regard to 2-, 3-, 6-mono-, 2,3-, 2,6-, 3,6-di-, 2,3,6-tri-, and 2,3,4,6-tetra-O-carboxymethylglucose as well as glucose and a distribution d of the carboxymethyl functions within the repeating units in the order d(O-2) > d(O-6) d(O-3).
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