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Studies of solution processes in hydrated starch and agar at low moisture levels using wide‐line nuclear magnetic resonance
Author(s) -
DUCKWORTH R. B.,
KELLY CAROLE E.
Publication year - 1973
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.1973.tb01694.x
Subject(s) - colloid , starch , deuterium , absorption (acoustics) , chemistry , moisture , water content , molecule , resonance (particle physics) , absorption of water , hydrogen , nuclear magnetic resonance , analytical chemistry (journal) , chromatography , materials science , organic chemistry , composite material , physics , geotechnical engineering , particle physics , quantum mechanics , engineering
Summary Experiments are described in which the proton magnetic resonance absorption of samples of hydrated starch and agar have been measured in the presence and in the absence of added test solutes containing different proportions of readily‐exchangeable hydrogen atoms in their molecules. The effect of these additions is described in otherwise untreated systems and in systems in which the hydrogen in the hydrated absorbent had been largely replaced by deuterium. In both cases, the size of the resonance absorption signal is unaffected by the additive at low levels of hydration of the colloid absorbent, but above a particular moisture content for each combination of absorbent and solute, the addition of the latter causes an incremental increase in signal. Evidence is presented that this increase is due to mobilization of the solute itself in the water present and does not arise from any influence of the additive on the condition of the water.