caa a22 4500 378859951 CHVBK 20180305123344.0 cr unu---uuuuu 161128e20030310xx s 000 0 eng 10.1515/BOT.2003.018 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2003.018 Structural Analysis of Carrageenan from Farmed Varieties of Philippine Seaweed [Elektronische Daten] [J. T. Aguilan, J. E. Broom, J. A. Hemmingson, F. M. Dayrit, M. N. E. Montaño, M. C. A. Dancel, M. R. Niñonuevo, R. H. Furneaux] 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 Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Aguilan J. T. aut Broom J. E. aut Hemmingson J. A. aut Dayrit F. M. aut Montaño M. N. E. aut Dancel M. C. A. aut Niñonuevo M. R. aut Furneaux R. H. aut Botanica Marina Walter de Gruyter 46/2(2003-03-10), 179-192 0006-8055 46:2<179 2003 46 botm https://doi.org/10.1515/BOT.2003.018 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2003.018 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aguilan J. T. aut NATIONALLICENCE 700 1- Broom J. E. aut NATIONALLICENCE 700 1- Hemmingson J. A. aut NATIONALLICENCE 700 1- Dayrit F. M. aut NATIONALLICENCE 700 1- Montaño M. N. E. aut NATIONALLICENCE 700 1- Dancel M. C. A. aut NATIONALLICENCE 700 1- Niñonuevo M. R. aut NATIONALLICENCE 700 1- Furneaux R. H. aut NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 46/2(2003-03-10), 179-192 0006-8055 46:2<179 2003 46 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter