Studies on Quantitative Distribution of Protein, Lipid, Phosphate and Potas sium in Rice Kernel

[摘要] Quantitative distribution of protein, lipid, phosphate and potassium in rice kernel was investigated by comparison of contents in l, OOO kernels which were milled in different rate. A friction type test mill for l0g sample was used for milling. Conclusion was shown in Fig.5. Changes with milling time of protein and kernel weight in milled rice were almost similar. Content of protein in highly-milled rice was about 90% as compared with the content in brown rice. From these facts it is considered that starch tissue of kernel is rich in protein. Lipid was one of the most rapidly decreased component by milling, and content of lipid in highly-milled rice was about 23% as compared with the content in brown rice. This fact may Show that lipid in rice kernel exists almost in bran especially in aleuron layer. Content of phosphate and potassium also shows considerable rapid decreases but more slowly than the decreases of lipid. Reducing curve of these component resembles together. Content of phosphate and potassium was respectively 43% and 39% as compared with the contents in brown rice. Perhaps phosphate and potassium may be components of phitin which is contained in aleuron grain and in protein body.

[学科分类] 农业科学（综合）