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Dynamic Rheological Measurement of Structure Development in High‐methoxyl Pectin/Fructose Gels
Author(s) -
RAO M.A.,
COOLEY H.J.
Publication year - 1993
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.1365-2621.1993.tb09381.x
Subject(s) - pectin , rheology , fructose , chemistry , food science , chemical engineering , materials science , composite material , engineering
Incipient structure development (SD) in 65% fructose—0.5, 0.75, and 1% high—methoxyl (HM) pectin gels (pH 2.7) being cooled (50–10°C) were measured in terms of dynamic viscosity (η*) at 1Hz. SD rates (poise/min) were higher at lower temperatures, higher pectin concentrations, and when pectin was hydrated for 16 hr. Below the gel temperature, SD rates in 1% gel followed the Flory‐Weaver model. SD in stored 0.5% gels during 22 days was strongly affected by storage temperature (2–38°C) and pH. SD rates in pH 2.7 gels were positive above, but negative below 18°C.