Abstract
The agar polysaccharides of the red seaweed Gracilaria chilensis Bird, McLachlan et Oliveira were labelled with the stable isotope 13C by pulse feeding NaH 13CO 3 to samples of this alga acclimatised to indoor culture. 13C NMR spectroscopy of the labelled polysaccharides extracted from these samples has been used to demonstrate conversion in vivo of 6- O-sulfo-l-galactopyranosyl residues into 3,6-anhydro- l-galactopyranosyl residues. The 6- O-sulfo-l-galactopyranosyl residues can be linked to either 6- O-methyl-d-galactopyranosyl residues or d-galactopyranosyl residues.
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