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An improved viscometric method for monitoring starch degradation
Author(s) -
Dickinson Eric,
McKay James E.,
Thomas Verian D.,
Warunek Catherine
Publication year - 1982
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740330211
Subject(s) - viscometer , starch , rheometer , hydrolysis , degradation (telecommunications) , dissolution , chemistry , chromatography , rheology , hydrolytic degradation , chemical engineering , materials science , viscosity , organic chemistry , composite material , telecommunications , computer science , engineering
The advantages of a commercial constant‐stress viscometer (the Deer Rheometer) for monitoring the kinetics of starch degradation are presented. The concentric cylinder arrangement is particularly appropriate for studying non‐Newtonian dispersions at the early stages of degradation. The rates of dissolution of wheat and ‘soluble’ starches in dimethylsulphoxide at 25°C are clearly distinguished, and the sensitivity of the extent of dissolution to the degree of agitation is demonstrated. The instrument provides a precise and convenient technique for following the hydrolysis of ‘soluble’ starch by α‐amylase. The reliability is confirmed by observing that the viscometrically determined optimum enzymic activity agrees with that found by chemical methods.