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Correlation of Proton T 1 with Polymer and Solute Waters in Starch‐Sucrose Mixtures
Author(s) -
CHINACHOTI PAVINEE,
STEINBERG M. P.
Publication year - 1989
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1989.tb04683.x
Subject(s) - starch , sucrose , polymer , proton , chemistry , proton spin crisis , relaxation (psychology) , sorption , diffusion , analytical chemistry (journal) , nuclear chemistry , thermodynamics , chromatography , physics , organic chemistry , nuclear physics , psychology , social psychology , adsorption
Proton pulsed NMR methodology was applied to correlate the observed spin‐lattice (T 1 ) and spin‐spin (T 2 ) relaxation times with the amount of water associated to sucrose (SOL) and that to starch (POL) in a sucrose‐starch model system containing both. Sucrose, starch and four mixtures were equilibrated to four water activities (a w , 0.86‐0.97). Calculations for T 2 were invalid due to an undeterminable amount of molecular diffusion caused by field inhomogeneity in the magnet. Model equations were developed for calculating SOL and POL from T 1 and a w ; These values showed high correlations (R 2 >0.97) with SOL and POL as determined from sorption data for sucrose and starch. This validated the use of this instrument with the mathematical models developed.