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Preparation of Mixed Derivatives of Carboxymethyl Starch and Determination of Substitution Degree by a New Colorimetric Method
Author(s) -
Roushdi M.,
AbdelAkher M.,
Ismail F. A.,
Attia E.
Publication year - 1982
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19820341205
Subject(s) - chemistry , starch , substitution (logic) , colorimetry , degree (music) , chromatography , organic chemistry , computer science , physics , acoustics , programming language
Carboxymethyl starch (CMS) and mixed CMS‐benzoate derivatives were prepared and some physical properties were estimated. A new colorimetric method for determination of the substitution degree (D. S.) of CMS derivatives by using I‐acid was developed. The factors affecting the color development and stability of I‐acid method were studied and the most suitable conditions for color reaction were found. The substitution degrees of prepared CMS and its mixed derivatives were determined by the I‐acid method and the results were compared with those of classical methods.