Influence of Culture Conditions on Growth and Physicochemical Properties of Carrageenans in Gigartina teedii (Rhodophyceae — Gigartinales)

Influence of Culture Conditions on Growth and Physicochemical Properties of Carrageenans in... 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Influence of Culture Conditions on Growth and Physicochemical Properties of Carrageenans in Gigartina teedii (Rhodophyceae — Gigartinales)

Botanica Marina, Volume 36 (2) – Jan 1, 1993

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0006-8055
eISSN
1437-4323
DOI
10.1515/botm.1993.36.2.131
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Botanica Marinade Gruyter

Published: Jan 1, 1993

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