Document Detail

Insights in starch acetylation in sub- and supercritical CO(2).
MedLine Citation:
PMID:  21549359     Owner:  NLM     Status:  Publisher    
An in-depth study on the acetylation of starch with acetic anhydride (Ac(2)O) and sodium acetate (NaOAc) as the catalyst in pressurized carbon dioxide (scCO(2)) in a broad pressure range (8-25MPa) and a temperature of 90°C is provided. Highest degrees of substitution (DS) of 0.29 (1h reaction time) and 0.62 (24h reaction time) were found near the critical point of the mixture (15MPa). The phase behavior of the system CO(2), starch and acetic anhydride (Ac(2)O) was studied in a high pressure view cell. The critical points were a clear function of the temperature and increased from the range of 9.4-10MPa to 14.5-14.8MPa when going from 50 to 90°C (Ac(2)O mole fraction at the critical point in the range of 0.08-0.09). Acetylation experiments with a range of starch particles sizes showed a clear relation between the DS and the particle size.
Henky Muljana; Francesco Picchioni; Zeljko Knez; Hero J Heeres; Leon P B M Janssen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-9
Journal Detail:
Title:  Carbohydrate research     Volume:  -     ISSN:  1873-426X     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-5-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043535     Medline TA:  Carbohydr Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Department of Chemical Engineering, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.
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