昆布葉体の無機成分の分布-I : 金属元素について

概要

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The metallic constituents of kombu (Laminaria japonica, two-year-old, harvested in Hakodate in summer) were studied with an atomic absorption spectrophotometer. The main components in the HCI-soluble ash were K (20-26), Na (13-15), Ca (5-7) and Mg (3g/100g). Minor elements were as follows: Fe (38-184), Al (23-88), Mn (2-4) and Cu (1mg/100g). Total amounts of these metals reached 45-50% of HCI-soluble ash. The sum of the oxide forms of these ions was calculated to be 60-65%. No characteristic patterns were observed in the distribution of these metals in the blade, except for higher contents of Fe, Al, and Mn in the apex. Ca and Fe analyses of 13 samples from different parts of the blade revealed that the apex and base were rich in Fe. A comparison of the determinative methods for Ca and Fe revealed that the values obtained by the atomic absorption spectrophotometric method were higher than the ones obtained by the usual chemical analysis. The value of total alkalinity was deter-mined as 153 on the whole blade.