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Mobility of Water in Corn Starch Suspensions Determined by Nuclear Magnetic Resonance
Author(s) -
Richardson S. J.,
Baianu I. C.,
Steinberg M. P.
Publication year - 1987
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.19870390304
Subject(s) - deuterium , chemistry , relaxation (psychology) , starch , moisture , nuclear magnetic resonance spectroscopy , analytical chemistry (journal) , corn starch , isotropy , heavy water , water content , nuclear magnetic resonance , chromatography , organic chemistry , physics , nuclear physics , psychology , social psychology , geotechnical engineering , quantum mechanics , engineering
The mobility of water in corn starch suspensions and high‐moisture powders (10 to 70% corn starch) was investigated by Nuclear Magnetic Resonance (NMR) spectroscopy, in water and deuterium oxide. Both oxygen‐17 ( 17 O) and deuterium ( 2 H) nuclei were probed with a single pulse. The standard isotropic two‐state model with fast exchange was used to interpret these data by means of a physical model (I) and a chemical activity model (II). According to I plots of relaxation rate against concentration indicated three regions of decreasing water mobility. According to II, the relaxation rate was linear with chemical activity over the entire concentration range. The correlation time calculated for the bound water showed high mobility.