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Determinatin of the Degree of Cationicity in Cationic Starches by Solid‐State 13 C NMR Spectroscopy
Author(s) -
Killinger William E.,
Murray Daniel,
Hatfield Galen R.,
Hassler Thord
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.19950470806
Subject(s) - cationic polymerization , nuclear magnetic resonance spectroscopy , relaxation (psychology) , degree (music) , chemistry , amine gas treating , spectroscopy , solid state , analytical chemistry (journal) , carbon 13 nmr , chemical shift , crystallography , stereochemistry , polymer chemistry , organic chemistry , physics , psychology , social psychology , quantum mechanics , acoustics
13 C solid‐state NMR is presented as a rapid and accurate method for determining the degree of substitution in cationic starches. Data are presented for four cationic starches where the cationizing agent is a trimethyl‐substituted quarternary amine. Using a rigorous quantitative approach, NMR determined DS values can be obtained that fall within ±0.01 DS units of those obtained by traditional wet chemical methods. By employing average relaxation parameters, the analysis time can be reduced to roughly one hour at the expense of an increase in uncertainty to only ±0.03 DS units.