Abstract
Variations of amino acid contents of rice were examined on samples differing in the transplanting stage and in the ripening stage. Lowland rice var. Norin No.25 and Kinmaze weresubjected to the examination at an experimental field with early and usual transplantationperiods. The rice samples collected at the three ripening stages, milky, late milky and perfect, were conducted to the amino acid assay by microbiological techniques.
No marked alteration in the amino acid composition was observed regarding to the differenceof transplanting stage throughout the ripening stages and rice varieties, however many kindsof amino acid of both the complete hydrolysate and water-eluted fraction of the rice samplesof the different ripening stages showed conspicuous alteration, especially between the milkyand late milky samples. The values of total arginine, alanine, lysine, threonine, glutamicacid, isoleucine, aspartic acid and proline and those of free (water eluted fraction) asparticacid, sulfur-containing and basic amino acids, glutamic acid, alanine, proline and isoleucinevaried markedly during the ripening period.
