Feruloyl- and Para-Coumaroyl-Carbohydrate Esters from Grass and Cellulose Degradation by Ruminal Microorganisms
- D.E. Akin ,
- R.D. Hartley and
- W. S. Borneman
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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