Flour starch thermal characteristics Modulated scanning calorimetric study |
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Authors: | L Haynes and M Schuenzel |
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Institution: | (1) Kraft Foods, 200 DeForest Av., East Hanover, NJ, USA;(2) County College of Morris, Randolph, NJ, USA |
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Abstract: | Thermal characteristics of refined wheat flour blend made with 90% Ohio soft red winter wheat and 10% Canadian Hard Red Winter
Wheat are explored using a series of modulated differential scanning calorimeter conditions. Influences of pan type, period,
amplitude of the thermal modulation, and underlying thermal heating rate on flour starch thermal transitions are presented.
Wheat flour was blend 1:1 with water, and then heated at various heating rates while the amplitude and period of the instantaneous
heating rate was modulated between ±0.5 and ±1.0 °C amplitude and 60 s to 80 s period. Study shows faster heating rates favor
increased total heat flow and results in proportional increases in both reversing and non-reversing thermokinetic events of
recrystallization. Slower overall heating rates (e.g., 2.5 °C min−1) produced better resolution of thermal events related to preexisting structural phases, but allowed more time for creation
of new events such as recrystallization, annealing. |
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