養殖マコンブ発育過程におけるエキスアシノ酸の消長

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Among the various cultivating methods of Kombu, one of the palatable seaweeds in Japan, an accelerating method by HASEGAWA was successful in shortening the cultivation period from young to a commercial size corresponding to two-year-old plants. One of the authors reported that although the free proline content was higher in the one-year-old plant than in the two-year-old one, glutamic and aspartic acids were more dominant than the other amino acids in the extractives of the latter, and which has been proved to be superior to the former in quality by organoleptic assessments. The present paper describes the change of the free amino acid composition of Makombu during cultivation by HASEGAWAs accelerated method. Four specimens were collected at Kakkumi near Hakodate City, Hokkaido, in April, May, June and July, and the base, central, and apex of the blade of each specimen was sampled for the analyses of free amino acids, total extractive nitrogen, and thickness. The results obtained are summarized in Table 2 and Figs. 1 to 5. The quantitative changes of glutamic and aspartic acids, proline and alanine were most remarkable. The content of glutamic acid was low in April and May, but it increased considerably in June and July. Proline was richest in the base and central parts in the early growing stage. Thus, the cultivated plant in April and May and that in June and July are similar to the natural ones of the one and two-year-olds, respectively, in free amino acid composition.
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養殖マコンブ発育過程におけるエキスアシノ酸の消長

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