11. Application of Freeze-Drying into a New Field (No.3) : Degrees of alpha rearrangement and swelling of freeze-dried starch (2)(Papers presented at the 38th Annual Meeting)
1992 Volume 38 Pages 74-82
Details
1992 Volume 38 Pages 74-82
Freeze dried starch (FDSt) reported herein is one of the typical New FD Materials. Water was added to starch, boiled to be paste, and subjected to freeze-drying to obtain a new material "liquid adsorbent" with fine and porous micell structure. Properties displayed by FDSt are quite different from those of commercially available alpha starch made under atmospheric pressure through the same process of heating treatment. In the first report, it was shown that the liquid adsorption ability of FDSt is higher by several times than that of the original starch, and the evaporation and diffusion rates of adsorbed alcohol are slower than the original starch. As it has been found that the swelling rate test which is used as a simple method for the assessment of the degree of alpha rearrangement can not be used for FDSt, we report the details of the matter and the investigations we have studied concerning it.
