Abstract Female gametophytes of Gigartina teedii collected on the coasts of Brittany (France) contain in equal proportion kappa- and iota-carrageenans. In order to increase exploitable quantities of G. teedii, by keeping high the yield of carrageenan, without modifying qualities of gelification or viscosity, we have studied in controlled culture the action of some factors: light, temperature and nitrogen on the growth rate of G. teedii as well their effect on physicochemical caracteristics of the polymer. Temperatures of 20 to 25 °C and light intensities of 500 m"2 s"1 give active growth. On the other hand, high light intensities induce active synthesis of rhodamylon at the expense of the yield of colloid. A medium without nitrate decreases growth, but increases yields of carrageenans. We have established for each factor an optimal value for maximum growth, with the estimation of the quality and the quantity of phycocolloid produced in the following of this growth. Introduction In the past twenty years Chondrus crispus Stackhouse and Mastocarpus stellatus (Stackhouse) Guiry, from the Atlantic coasts, and various species of Eucheuma farmed in the Philippines, have been mainly used for the production of carrageenans. Species from the Atlantic are for the most part still
Botanica Marina – de Gruyter
Published: Jan 1, 1993
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