Dextrins atmosphere effects

Fig. I. Single-drum dryer (atmospheric). Dryers of this type may be dip or splash fed (not shown), or, as shown, equipped with applicator rolls. The latter is particularly effective for drying high-viscosity liquids or pasty materials, such as mashed potatoes, applesauce, fruit-starch mixtures, gelatin, dextrine-type adhesives, and various star dies. The applicator rolls eliminate void areas, permit drying between successive layers of fresh material and (omi me product sheet gradually. While single applications may dry to a lacy sheet or flakes, the multiple layers generally result in a product of uniform thickness and density with minimum dusting tendencies. (Bujiovak Division, BlawKnox Food Chemical Equipment. Inc)...

The solubility-temperature relationship for 1 hofheating of starch, with nitric acid as the catalyst, is presented in Fig. 11. The solubility of dextrins formed can be influenced by contact with the atmosphere. Vacuum, as well as air flow, favor the presence of soluble matter in dextrinized starch (see Fig. 12). However, the effect observed may be attributable to continuous removal of moisture. On the other hand, the results of the present authors showed that the course of dextrinization under nitrogen, carbon dioxide, and in air yields different dextrins of various solubility and stability after a given period of dextrinization. 

As shown by the present authors, atmospheric oxygen does not affect DTA, DTG, and TG curves to such an extent that oxidation can be accepted as an important process in the range up to 300°. The dextrinization of starch does not change the points of thermal effects, that is, an endothermic effect, with its maximum at —80° (loss of humidity), a very small endothermic effect between 200 and 222°, which ceases at the stage of fully soluble... 

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