Galactan sulphates have been extracted from mechanically isolated cell walls of laboratory cultured conchocelis phases of Porphyra leucostricta and Bangia atropurpurea and their structure established by chemical methods and 13C-n.m.r. spectroscopy. The polysaccharides represent an extreme structure for porphyran-type polymers in that they consist almost entirely of 3-linked β-D-galactosyl residues alternating with 4-linked α-L-galactose-6-sulphate residues, the molar ratio of D to L units being approximately 1: 1. 13C-n.m.r. and gas-liquid and paper chromatography gave no indication of 6-O-methyl-D-galactose in these polymers. Conchocelis galactans are chemically distinct from porphyrans of generic phases of Porphyra and Bangia.
- Cell walls
ASJC Scopus subject areas
- Statistics, Probability and Uncertainty
- Applied Mathematics
- Ecology, Evolution, Behavior and Systematics
- Plant Science