Abstract
Ash contents and inorganic constituents of the starch samples prepared from potatoes cropped at the five Agricultural Experimental Stations in Hokkaido were determined. Their viscosity and distribution in granule size were also measured. The five Experimental Stations were located at Shibetsu, Memuro, Shari, Shimamatsu and Nakashibetsu respectively. The varieties of the potato samples were Normn No. 1, Benimaru, Shiretoko, Danshaku, Eniwa, Hokkaiaka, Tarumae and Bihoro. The experimental results were summarized as following;1. The ash contents of starch prepared from potatoes cropped at the Shibetsu and Memuro Station showed higher values than those of the other three samples. Among the three low ash members, the starch from Shari showed rather high ash content.2. The main constituents of the inorganic components of each starch sample were found to be phosphorus and potassium.3. Viscosity of each starch sample was measured by means of Brabender Amylograph. The peak viscosity of starch samples prepared from potatoes cropped at the Shibetsu and Memuro stations showed higher values than those of other samples.4. Starch samples prepared from Bihoro and Benimaru potatoes showed higher contents of large starch granules as compared with those from Shiretoko, Danshaku and Normn No. 1.
