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This article in AJ

  1. Vol. 84 No. 4, p. 613-615
     
    Received: July 8, 1991
    Published: July, 1992


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doi:10.2134/agronj1992.00021962008400040014x

Feruloyl- and Para-Coumaroyl-Carbohydrate Esters from Grass and Cellulose Degradation by Ruminal Microorganisms

  1. D.E. Akin ,
  2. R.D. Hartley and
  3. W. S. Borneman
  1. Richard B. Russell Agric. Res. Center, USDA-ARS P.O. Box 5677, Athens, GA 30613.

Abstract

Abstract

Phenolic compounds are a primary limitation to forage digestibility, but the specific mechanism that limits microbial activity requires elucidation. The objective of this research was to determine the influence of phenolic acid-carbohydrate esters isolated from ‘Coastal’ bermudagrass (Cynodon dactylon L. Pers.) on cellulolysis by rumen microorganisms. One or 5mM concentrations of 0-[5-0-(trans-feruloyl)-α-L-arabinofuranosyl]- (1→3)]-0-β-D-xylopyranosyl- (1→4)-D-xylopyranose (FAXX), 1 mM 0-[5-0-(trans-p-coumaroyl)-α-L-arabinofuranosyl]-(1→3)-0-β-D-xylopyranosyl-( 1→4)-D-xylopyranoses(PAXX), equivalent concentrations of free phenolic acids and equivalent concentrations of L-arabinose plus D-xylose were added to anaerobic incubation vials containing MN 300 cellulose. Inhibition of cellulolysis by about 24% in the 5 mM study appeared to be due to the sugars and not the phenolic moiety. These studies suggest that these free phenolic-carbohydrate esters have minimal effect on fiber-digesting microorganisms in the rumen.

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