Abstract
AbstractThe complexing of Ca2+and Afg2+, in a salt solution of cationic composition similar to that of the duodenal fluid of a ruminant, by polysaccharides, lignin and organic acids from the grass Yorkshire Fog is investigated using an ion‐exchange resin method. Regression expressions relating solution cation concentration to the equilibrium resin cation concentrations are derived and used as calibration equations to determine the amounts of bound and ionic Ca2+ and Mg2+in solutions in equilibrium with the plant fractions.Pectin, lignin and the organic adds are effective in complexing a large proportion of the Ca2+in a non‐ionic form but only lignin and the acids display significant complexing of Mg2+. The hemicelluloses and cellulose have little ability to complex either Ca2+or Mg2+. The results are discussed in terms of the digestion of these plant fractions in vivo.
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