Structural Analysis of Carrageenan from Farmed Varieties of Philippine Seaweed
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J. T. Aguilan
Abstract
Kappaphycus alvarezii, Eucheuma denticulatum and, more recently, Kappaphycus sp. ‘Sacol’ variety, are the carrageenan-containing red seaweeds currently farmed in the Philippines. The Kappaphycus sp. ‘Sacol’ variety is of particular interest to the Philippine seaweed industry because of its improved resistance to ‘ice-ice’ disease and its fast growing characteristics. Here we report on the detailed chemical analysis of the carrageenan from this species. The native and alkali-modified carrageenans from Kappaphycus sp. ‘Sacol’ variety were characterized by FT-IR, 1H and 13C NMR spectroscopy, and constituent sugar and methylation analyses and were compared to those from K. alvarezii, K. cottonii and Eucheuma denticulatum. The three Kappaphycus species contained predominantly κ-carrageenan with low levels of ι-carrageenan, methylated carrageenan and μ-precursor residues, while Eucheuma denticulatum contained predominantly ι-carrageenan with significant amounts of ν-precursor residues. Taxonomic classification of Kappaphycus species based on morphology has proved to be difficult because of their known plasticity. Molecular analysis using the rbcL sequence revealed that the Kappaphycus sp. ‘Sacol’ variety is most likely a form of K. cottonii.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Comparative Morphology and Taxonomy of Sphacelaria Species with Tribuliform Propagules (Sphacelariales, Phaeophyceae)
- Reproductive Strategies of Ceramium tenuicorne Near Its Inner Limit in the Brackish Baltic Sea
- Dinoflagellate Cysts in Recent Sediments from Bahía Concepción, Gulf of California
- Occurrence of Carrageenan Structure in an Agar from the Red Seaweed Digenea simplex (Wulfen) C. Agardh (Rhodomelaceae, Ceramiales) with a Short Review of Carrageenan-Agarocolloid Hybrid in the Florideophycidae
- An Updated and Annotated List of Marine Brown Algae (Phaeophyceae) of the Caribbean Coast of the Republic of Panama
- Influence of the Plume of the River Po on the Distribution of Subtidal Microphytobenthos in the Northern Adriatic Sea
- Structural Analysis of Carrageenan from Farmed Varieties of Philippine Seaweed
- Morphology and Nuclear Small-subunit rDNA Sequences of Ishige (Ishigeaceae, Phaeophyceae) and its Phylogenetic Relationship among Selected Brown Algal Orders
- A Molecular Investigation of Mazzaella (Gigartinales, Rhodophyta) Morphologically Intermediate Between Mazzaella linearis and M. splendens
- Meetings
