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CREEP AND DYNAMIC RHEOLOGICAL BEHAVIOR OF TOMATO CONCENTRATES: EFFECT OF CONCENTRATION AND FINISHER SCREEN SIZE
Author(s) -
YOO BYOUNGSEUNG,
RAO M.A.
Publication year - 1996
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.1996.tb00087.x
Subject(s) - viscoelasticity , rheology , creep , dynamic mechanical analysis , materials science , dynamic modulus , brix , pulp (tooth) , modulus , composite material , food science , chemistry , polymer , sugar , medicine , pathology
Based on laser diffraction, pulp particles > 900 μm were detected in tomato concentrates; particles greater than 100–200 μm were found in serum from a concentrate. Creep‐compliance and dynamic rheological data showed that viscoelastic properties of 21 °Brix tomato concentrates using a 0.84 mm finisher screen were higher than those from a 0.69 mm screen. Both types of viscoelastic properties were sensitive to increase in concentration in that they increased with increase in Brix of the concentrates. Magnitudes of instantaneous modulus (G 0 = 1/J 0 ) of the tomato concentrates were of the same order of magnitude as the storage modulus (G') at 1 rad s ‐1 .