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Quantitative Analysis of Chemically Modified Starches by 1 H‐NMR Spectroscopy
Author(s) -
De Graaf R. A.,
Lammers G.,
Janssen L. P. B. M.,
Beenackers A. A. C. M.
Publication year - 1995
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.19950471205
Subject(s) - nuclear magnetic resonance spectroscopy , chemistry , spectroscopy , analytical chemistry (journal) , quantitative analysis (chemistry) , chromatography , organic chemistry , physics , quantum mechanics
A quantitative 1 H‐NMR method for the determination of the Molar Substitution ( MS ) of acetylated and hydroxypropylated starches was developed and tested for MS ranging from 0.09 to 0.5. Results were checked using the Johnson method and a titration method for hydroxpropylated and acetylated starch, respectively. Hydroxypropylated starch was produced using both a static mixer reactor (SMX type) and a co‐rotating twin screw extruder. Acetylated starch was produced using a counter‐rotating twin screw extruder. Quantitative analysis results of the 1 H‐NMR method were in good agreement with traditional analysis methods for all samples tested. Main advantage of the 1 H‐NMR method is the considerable time saving as compared to the traditional analysis methods.