Water sorption isotherms of native, partially gelatinized, andgenistineCA complex-containing JFSS are shown in Fig. 8. Theshapes of all four sorption isotherms belonged to the category oftype II isotherm among Brunauer's five basic forms of adsorptionisotherms. Many biological and food materials shows this pattern ofisotherm that can be characterized using BET or GAB models (Roos,1995). At low water activity region (<0.3), the equilibrium moisturecontent of the partially gelatinized JFSS was not different from thatof native starch. However, in the region of high water activity(>0.4), the equilibrium moisture content of the products containing partially gelatinized starch was significantly higher than that ofnative starch. For instance, at 15 g water/100 g total (general dryproducts), the partially gelatinized starch products had water activityof ~0.6 significantly lower than that of the native starch (~0.8).The partial gelatinization process could be a useful technology tolower the water activity of food or pharmaceutical productswithout adding sweetness. It should also be stressed that, ifexposed to the same relative humidity (water activity), the partiallygelatinized JFSS would adsorb or absorb more moisture to give ahigher equilibrium moisture content.
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