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- Title
CO-OCCURRENCE OF CARRAGEENANS AND AGAROIDS IN GYMNOGONGRUS TORULOSUS (GIGARTINALES, PHYLLOPHORACEAE) FROM ARGENTINA.
- Authors
Estevez, J. M.; Ciancia, M; Cerezo, A.S.
- Abstract
The red seaweeds, Gigartina skottbetgii and Sarcothalia crispata, have commercial value as raw material for the industrial production of phycocolloids (carrageenans) in Argentina. The third alga with potencial possibilities for the carrageenan production is Gymnogongrus torulosus. Herein, we report the study of the polysaccharide system present in Gymnogongrus torulosus, which contribute to the estimation of the importance of this algae in the seaweed industry. Analysis of the hot water-soluble extract (C1), by FT-IR, methylation and 13C NMR, showed mainly the presence of iota/kappa carrageenan hybrid (molar ratio ∼ 2:1). The soluble fractions obtained after KCl fractionation (F3, 16.1 % of C1) and soluble after alkaline treatment and KCl fractionation (F3T3, 34.6% of F3T) gave negative optical rotations (−15.5 and −55.4, respectively), considerably lower than those reported for kappa/iota carrageenans (from 56.1 to 66.5). These fractions (F3 and F3T3) have significant quantities of L-galactose (11.1% and 29.8%) and L-3,6-anhydrogalactose (19.2% and 4.3%). The direct relationship between the optical rotation and the percentage of L-galactose indicated that its structural influence is similar in all the fractions. The results suggest that Gymnogongrus torulosus biosynthesizes a polysaccharide system with co-occurrence of carrageenans and agaroids in the same thallus.
- Subjects
GIGARTINALES; PHYLLOPHORACEAE
- Publication
Journal of Phycology, 2000, Vol 36, p20
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1046/j.1529-8817.1999.00001-61.x