V DiNinno | PubMed Health

PubMed1978

The chemistry and immunochemistry of carrageenans from Eucheuma and related algal species.

Carrageenans from several species of Eucheuma have been fractionated into KC1-soluble and KC1-insoluble fractions and analyzed by the usual chemical procedures. An anti-kappa-carrageenan, the reactivity of which is directed to kappa-structures (i.e., 3-linked galactose 4-sulphate, and 4-linked 3,6-anhydrogalactose) was used to analyze these carrageenans immunochemically. The antibody preparation shows only a small amount of cross-reactivity with iota-type carrageenans and thus could be used to distinguish kappa- and iota-type carrageenans, the latter having an index of homology of less than 0.2. A comparison of chemical and immunochemical data yielded further information as to the nature of the carrageenan-anti-carrageenan interaction, as well as elucidating the finer structure of carrageenans.

Carrageenan↗

PubMed1978

The immunochemistry of lambda-type carrageenans from certain red algae.

An antibody preparation directed against a structural feature associated with 6-sulphate groups was used to probe structural relations among certain lambda-type carrageenans. Immunochemical and chemical differences are described between the KC1-soluble carrageenans from tetrasporic algal plants of Gigartina corymbifera, Gigartina sp. from San Francisco Bay, Petrocelis middendorfii, Iridaea cordata, Rhodoglossum californicum, and Chondrus crispus. The differences in immunochemical reactivity of the Gigartina and Petrocelis carrageenans relative to the homologous antigen (Chondrus crispus lambda-carrageenan) are attributed to the lower content of 6-sulphate groups on the 4-linked residues in the former carrageenans. Both the immunochemical and chemical data suggest that the Gigartina and Petrocelis carrageenans are largely xi-like in structure but do contain lambda-like features. The i.r. spectrum of the Petrocelis carrageenan differs from that of the Gigartina carrageenans. The carrageenans from I. cordata and R. californicum differ to a lesser degree from Chondrus crispus lambda-type carrageenan. These differences cannot be accounted for by differences in the levels of 6-sulphate groups. Some other structural feature, as yet unidentified, is responsible for the discrepancy in the immunochemical reactivity of these carrageenans to the anti-lambda-carrageenan.

Animals↗