昆布の品質-V : 昆布葉体の厚みと全窒素との分布

概要

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A survey was made on the difference in the thickness and in the content of nitrogen found in various positions of a blade of kombu, Laminaria japonica, which was harvested from Hakodate in August 1961. The sampled positions on the blade are shown in Fig. 1. The results of survey are given in Tables 1 and 2, and in Figs. 2 and 3. As known in the above tables and figures, the parts of the blade near to the base and stipe are richer in nitrogen and are larger in thickness than the marginal and apical parts. As was reported in the previous paper1) by Oishi et at, the base and stipe of a blade are better in quality than the margins and apex. Consequently it may be concluded that the quality of the parts on a blade depends closely upon its thickness and nitrogen content. The average values of thickness and nitrogen content in the various parts, - stipe, base, center, margins, and apex are exhibited in Table 3. These values will also indicate the degree of quality of kombu parts. The correlation coefficient (γ) between thickness and nitrogen content was 0.530, showing a positive correlation between them.