Premium
Kernresonanzuntersuchungen an Wasser in Stärkegelen bei 295 K
Author(s) -
Basler W.,
Lechert H.
Publication year - 1973
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.19730250902
Subject(s) - bound water , free water , starch , relaxation (psychology) , saturation (graph theory) , analytical chemistry (journal) , chemistry , line (geometry) , phase (matter) , materials science , proton nmr , water saturation , nuclear magnetic resonance , chromatography , molecule , stereochemistry , physics , organic chemistry , environmental science , combinatorics , environmental engineering , psychology , social psychology , mathematics , porosity , geometry
Wide‐Line NMR of Water in Starch Gels at 295 K The purpose of this work was to decide if it is possible to detect bound and free water in starch gels for T > 0°C by wide‐line NMR at various RF‐levels. Therefore, we measured the longitudinal (T 1 ) and transverse (T 2 ) relaxation of the water protons in maize starch gels of different water concentrations at 295 K by pulsed and wide‐line NMR. The absorbed water showed single‐phase behaviour at all water concentrations. A separation into bound and free water was not seen. The determination of bound water by wide‐line NMR is shown to be a pure effect of RF‐saturation which can be calculated by the T 1 and T 2 values we measured.