Soluble Phenolic Compounds in Fresh and Ensiled Orchard Grass (Dactylis glomerata L.), a Common Species in Permanent Pastures with Potential as a Biomass Feedstock

B. Hauck, J. Gallagher, Stephen Michael Morris, David Keith Leemans, A. Winters

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Abstract

High-value coproducts can greatly improve the feasibility of utilizing plant feedstocks for biorefining and biofuel production. Plant polyphenolics have potential application in the pharmaceutical and cosmetic industries. Orchard grass varieties have been noted for accumulation of polyphenolic compounds, and the current study determined the soluble phenol profile and content in the orchard grass variety ‘Abertop’. Hydroxycinnamates and flavonoids were monitored during the transition from vegetative to flowering stage at maximum crop yield. Caffeic acid derivatives, related to bioactives in the Asian medicinal herb Salvia miltiorrhiza, and novel hydroxycinnamate–flavone conjugates were also identified in extracts. Harvest yields of hydroxycinnamates and flavonoids ranged from 2.6 to 4.0 kg/ha and from 2.1 to 5.1 kg/ha, respectively. Abundant compounds showed high levels of antioxidant activity comparable with that of trolox. Minimal changes in soluble phenol content and composition were observed after ensiling with the exception of increases in caffeic acid, a caffeic acid derivative, and a caffeic acid breakdown product, dihydroxystyrene.
Original languageEnglish
Pages (from-to)468-475
Number of pages8
JournalJournal of Agricultural and Food Chemistry
Volume62
Issue number2
Early online date31 Dec 2013
DOIs
Publication statusPublished - 15 Jan 2014

Keywords

  • Dactylis glomerata
  • orchard grass
  • phenolic acid esters
  • flavonoid glycosides
  • caffeic acid derivatives
  • Caffeic Acids/analysis
  • Flavonoids/analysis
  • Dactylis/chemistry
  • Solubility
  • Polyphenols/analysis
  • Biomass
  • Biofuels
  • Silage/analysis
  • Phenols/analysis
  • Antioxidants/analysis
  • Coumaric Acids/analysis
  • Animal Feed

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