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Comparative laboratory study demonstrates structural differences among Rhodophyta lambda carrageenans, indicating antibody specificity for carbon-6 sulfate groups.
KCl soluble carrageenans from sporophytes of twoGigartinaspecies were differentiated from those ofChondrus crispusStackhouse,Iridaea cordata(Turner) Bory,Rhodoglossum californicum(J. Ag.) Abbott, and twoPetrocelisspecies by their failure to precipitate on immunodiffusion against either of two absorbed anti‐λ–carrageenan antisera. The carrageenans have been analyzed by infrared spectroscopy, and on this basis it is postulated that the antibody preparations recognize sulphate on C‐6 of the carrageenans. TheGigartinacarrageenans appear to lack sulfate at this position.
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Evelegh et al. (1978) studied this question.
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