南九州産二三紅藻類の寒天原藻としての利用

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タイトル別名
  • On the Utility of Some Red Algae as Agar Source in the Southern Sea of Kyushu
  • ミナミキュウシュウサン ニサン コウソウルイ ノ カンテン ゲン ソウ ト シテ ノ リヨウ

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説明

The utility, as agar source, of three species of red algae collected from the southern sea of Kyushu, Gracilaria verrucosa (HUDS.) PAPENFUSS, Hypea charoides LAMOUROUX and Grateloupia okamurai YAMADA, was investigated with the application of alkali-treatment method. From Gracilaria and Hypea pre-heated with alkali, agars having a considerably high gel-strength were prepared in ordinary yields. The frond of Grateloupia disintegrated almost completely during pre-heating, the resultant solutions having only weak gelling capacity (Table 1). When Grateloupia was pressure-cooked with alkali under certain conditions, agar-product could be prepared from its extract (Figs. 1 and 2). Sulfate content of agar from the alkali-cooked Grateloupia was slightly less than that of dried material (Table 3). This suggests that the effect of alkali-cooking might be brought about by some other factors besides the decrease of sulfate content. Gelation of the Grateloupia extract was enhanced by the presence of some salts (Fig.3). Admixture of Grateloupia to Gelidium reduced the gel-strength of agar, leading to an increase of its yield (Table 2).

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