Experimental Studies on the Carboxymethylation of Arrowroot Starch in Isopropanol-Water Media

The reaction between granular arrowroot starch and sodium monochloroacetate (SMCA) in isopropanol‐water mixtures has been studied in a systematic way using experimental design strategies. The effect of six factors, i.e. the theoretical degree of substitution (DSt), reaction time, weight fraction of...

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Bibliographic Details
Published in:Die Stärke 2003-11, Vol.55 (11), p.495-503
Main Authors: Kooijman, Laura M., Ganzeveld, Klaassien J., Manurung, Robbert M., Heeres, Hero J.
Format: Article
Language:English
Subjects:
Arrowroot starch
Biological and medical sciences
Carboxymethylation
Experimental design
Food industries
Fundamental and applied biological sciences. Psychology
Modification
Starch and starchy product industries
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Summary:The reaction between granular arrowroot starch and sodium monochloroacetate (SMCA) in isopropanol‐water mixtures has been studied in a systematic way using experimental design strategies. The effect of six factors, i.e. the theoretical degree of substitution (DSt), reaction time, weight fraction of water in the mixture, NaOH/SMCA ratio, temperature and weight fraction of starch on three responses, i.e. the degree of substitution (DS), the conversion of SMCA and the selectivity of SMCA towards carboxymethyl starch, has been determined in a systematic manner. Granular carboxymethyl arrowroot starch with a maximum DS of 1.4 could be prepared in a singlestep procedure. The results are compared with data obtained for potato starch. Similar trends for all responses were observed, suggesting close similarities between the chemical composition and the topochemistry of granular arrowroot‐ and potato‐starch.
ISSN:0038-9056
1521-379X
DOI:10.1002/star.200300217