Insights in starch acetylation in sub- and supercritical CO2.
Carbohydr Res
; 346(10): 1224-31, 2011 Jul 15.
Article
em En
| MEDLINE
| ID: mdl-21549359
ABSTRACT
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Amido
/
Solanum tuberosum
/
Dióxido de Carbono
Idioma:
En
Revista:
Carbohydr Res
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Holanda