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Carrageenans: Part V. The masked repeating structures of λ- and μ-carrageenans by N.S. Anderson; T.C.S. Dolan; C.J. Lawson; A. Penman; D.A. Rees is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Carrageenans: Part V. The masked repeating structures of λ- and μ-carrageenans about?

For the potassium chloride-soluble fractions of five carrageenans, correlations have been established between 3,6-anhydrogalactose content and the products of methylation and fragmentation. After modification with alkaline borohydride, two subfractions were obtained, and shown to be distinct by methylation analysis and other methods. Carrageenan is now believed to contain three polysaccharide components: Ic-carrageenan, E.-carrageenan, and /c-carrageenan. All have masked repeating structures based on alternately (I +3)-and (I-+4)-Iinked galactose residues, but there are important differences in sulphation pattern and 3,6-anhydride content. ## REStiiTS AND DISCUSSION Methylation and other methods have shown4s6 that the potassium chloridesoluble fraction of carrageenan (Sample 1, Table ) contains both (1+3)-and (l-4)linked galactose residues. Most of the former type are 2-sulphated, although some are 4-sulphated and others are nonsulphated; the (144)-type occurs chiefly as galaciose 2,6-disulphate, but also as 3,6\_anhydrogalactose (and/or its 2-sulphate) and galaclose 6-sulphate. The variation of gross composition from one sample to another' might indicate polymer heterogeneity. Sev

Who reads Carrageenans: Part V. The masked repeating structures of λ- and μ-carrageenans?

Author

N.S. Anderson; T.C.S. Dolan; C.J. Lawson; A. Penman; D.A. Rees

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6215)

Published

1968

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)