PIGMENT STABILIZATION OF FRESH UNDARIA PINNATIFIDA WHEN TREATED WITH ASHES

재(회) 처리의 미역 색소 안정화 효과

In this study, changes in chlorophyll and carotenoid pigment in fresh and ash treated Undaria pinnetifida were determined by column chromatography. And pigment stabilizing effects of ashes were discussed. The results obtained are summarized as follows: 1. The main carotenoids of Undaria pinnetifida are fucoxanthin, violaxanthin, lutein and $\beta-carotene$. 2. In storage of fresh Undaria pinnetifida at $2-5^{\circ}C$ for 30 days, chlorophyll a decreased rapidly and mainly converted to pheophytin a. Among carotenoids, lutein was markedly lost while the others retained approximately $30\%$ after 30 days' storage. 3, By treating the sample with ashes, the loss of chlorophyll a was restrained whereas that of carotenoids seemed to be promoted. It is considered that pigment stabilization was attributed to both effect, the pH control effect by the alkalinity of ashes and the fixation of the pigment by heavy metals in ashes. The stabilizing effect of chlorophyll a differed from the kind of ashes used. Reed ashes showed better effect than others such as straw or pine ashes. 4. Since fucoxanthin is extremely sensitive to alkali the treatment of ashes with a high alkalinity resulted in rapid decrease of the pigment during storage. 5. In the analysis of ashes, reed ashes which had better effect on chlorophyll a retention than the other ashes showed the highest content of iron.