Fig. 5 shows the displacement curves for starch and
be expected, the magnitude of overall displacement was mostly
dependent on the moisture content of the sample. The onset, midpoint and endpoint of the first transition obtained at each moisture
content using TMA was determined using tangents and abisector line. The midpoint was determined from the point of in flection in the TMA displacement curve as it gave more reproducible data than
theme an of the onset and endpoint temperatures.Additionally,the
derivative of the displacement curve resulted in a peak which was
found to be very close to the temperature obtained from the midpoint/point of inflection in the curve. These results are detailed in
Table 2.