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Feruloyl‐ and Para‐Coumaroyl‐Carbohydrate Esters from Grass and Cellulose Degradation by Ruminal Microorganisms
Author(s) -
Akin D.E.,
Hartley R.D.,
Borneman W.S.
Publication year - 1992
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1992.00021962008400040014x
Subject(s) - rumen , chemistry , cynodon dactylon , carbohydrate , microorganism , xylose , cellulose , arabinose , food science , forage , phenols , incubation , fermentation , organic chemistry , botany , bacteria , biochemistry , biology , genetics
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 5m M concentrations of 0‐ [5‐ 0 ‐( trans ‐feruloyl)‐α‐L‐arabinofuranosyl]‐ (1→3)]‐ 0 ‐β‐D‐xylopyranosyl‐ (1→4)‐D‐xylopyranose (FAXX), 1 m M 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 m M 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.