Studies on the Manufacturing Process of the Undaria-products-I

On the Alkali-treatment at High Temperature of the Frond for Keeping the Green Pigment

Abstract

In the previous note¹⁾, it was shown that the fading of green color is due to the acidi-fication of Undaria and an alkali-treatment of the frond will be effective to keep the green pigment from the analysis of “Haiboshi-Wakame”.
In this paper, a practical procedure for alkali-treatment of the frond with brine con-taining Ca(OH)₂ has been studied for keeping the green pigment. The results obtained are as follows;
1) The heat treatment with about 3% NaCI solution or sea water for 5-10 seconds was effective in the case of pH: 8.5-9.5, temperature: 75-85°C. (Fig. 1-4.).
2) These application to some dry and salt Undaria-products was tried successtully during 1-5-month storage. (Table 1.).