Abstract
Carrageenans from the following red algae, Eucheuma spinosum, Eucheuma cottonii (Solieriaceae), Chondrus crispus gametophytes, and Gigartina stellata (Gigartinaceae) have been fractionated in order to obtain enriched fractions of carrageenan precursor(s) (μ- and ν-carrageenans). I.r. and 13C-n.m.r. spectroscopy have been used to identify structures present in these fractions and in total extracts from Ahnfeltia concinna and Ahnfeltia gigartinoides (Phyllophoraceae) and both methods are compared. ν-Carrageenan (precursor of ι-carrageenan) was the only precursor that could be detected in E. spinosum, E. cottonii, and the two Ahnfeltia species. E. cottonii fraction was also enriched in ι-carrageenan; this structure was partially methylated at O-6 of the d-galactose residue (m.s. determination). μ-Carrageenan (precursor of κ-carrageenan) was identified as the only precursor in the gametophyte fraction of C. crispus. Both structures μ and ν were present in G. stellata. 13C-N.m.r. spectroscopy is shown to be a good method of characterizing these structures, giving more accurate results than i.r. spectroscopy.
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