アルギン酸製造に関する基礎的研究-IV : アルギン酸抽出液中の着色々素について

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Various experiements are carried out so as to throw light on the pigments dissolved in alginate solution extracted with alkali solution, and results obtained are as follows: 1. The degree of colouring of alginate solution extracted with sodium carbonate is in-creased according to the rise of alkali concentration, extraction time and extraction tempera-ture. (Fig. 1, 2 and 3). The degree of colouring in the extracted solution increases in pro-portion to the yield of sodium alginate (Table 1). 2. The pigments which caused colouring in the extracted solution of alginic acid are ex-tracted with 60 per cent methanol (Table 2). 3. The degree of colouring of the pigments solution extracted with methanol increases by heating together with alkali, but not by heatiag together with acid (Fig. 4). The degree of colouring is increased by the dissolved oxygen in the presence of alkali (Table 5).
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