Premium
A Pulsed NMR Method for the Study of Starch Retrogradation
Author(s) -
Teo C. H.,
Seow C. C.
Publication year - 1992
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.19920440804
Subject(s) - retrogradation (starch) , starch , recrystallization (geology) , materials science , component (thermodynamics) , signal (programming language) , pulse (music) , analytical chemistry (journal) , chemistry , chromatography , optics , computer science , biochemistry , physics , thermodynamics , biology , amylose , paleontology , detector , programming language
A rapid and non‐destructive pulsed NMR method of monitoring starch retrogradation was developed based on the principle that the signals from protons in the “solid‐like” and liquid components in a system decay at significantly different rates following a 90° radio‐frequency pulse. As molecular association or recrystallization proceeds during aging of a starch gel, the proportion of the “solid‐like” component in the system increases. The resulting decrease in segmental mobility of the starch chains causes a decrease in the signal from the liquid component, but a concomitant increase in the signal attributed to protons in the “solid‐like” fraction. The method was applied to study the retrogradation tendency of starches from different botanical sources.