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Presence of Soluble Lignin-carbohydrate Complexes in the Bovine Rumen by Blanche D.E. Gaillard; Geoffrey N. Richards is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The cell-free rumen liquor of a steer on a diet of spear grass has been shown to contain macromolecalnr s;lbstances in which carbohydrates and lignin-derived compounds are covalently bound to each other. The lignin+rbohydrate complexes are soluble at pH 7 or higher, but precipitate at pH 3. At the latter pH, small amounts of a poIymer, assumed to be glycoprotein, remain in solution. Some of the lignincarbohydrate linkages are broken by treatment with alkali. Treatment with 5Om~ sulphuric acid for a few minutes at room temperature converts part of the complex into an acetone-soluble product, which still contains both carbohydrate and ligninderived compounds. The formation of soluble lignin-carbohydrate complexes by the action of rumen micro-organisms on the grass may accormt for the 'dissolution (and hence the apparent digestion) of about half of the total lignin-intake.

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Author

Blanche D.E. Gaillard; Geoffrey N. Richards

Publisher

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

Published

1975

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)