Abstract The content, infrared spectroscopy, total sulphate and optical rotation of the phycocolloid from Laurencia papillosa (Forssk.) Grevüle from Tanzania have been investigated. A phycocolloid yield of 33.6 ± 0-6% was obtained on a dry weight basis. The total sulphate content of the phycocolloid was 16.8 ± 0.4% and the optical rotation was found to be negative [a|D5 - 5.5 °. The phycocolloid was soluble in potassium Chloride. Its IR spectra showed absorption peaks more akin to -than -or -cairageenan. A detailed discussion of these findings is presented. Introduction Laurencia Lamouroux (Rhodophyta, Ceramiales) is one of the most widespread seaweeds on tropical and warm temperate shores. About 80 species of the genus have been reported in the literature (Kylin 1956). Twelve of these are known to occur in Tanzania (Jaasund 1976). The most abundant and best known of the Tanzanian species is L. papillosa (Forssk.) Greville. Records of this species in the west Indian region include those by Hauck (1887) from the Somali coast, Schmitz (1895) and Schroeder (1912) from Tanzania, Papenfuss (1968) from the Red Sea, and Isaac (1967) from the Kenya coast. Species of Laurencia are economically important in various parts of the world such äs
Botanica Marina – de Gruyter
Published: Jan 1, 1977
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