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Soluble phenolic compounds in fresh and ensiled orchard grass (Dactylis glomerata L.), a common species in permanent pastures with potential as a biomass feedstock.

Authors
  • Hauck, Barbara
  • Gallagher, Joe A
  • Morris, S Michael
  • Leemans, David
  • Winters, Ana L
Type
Published Article
Journal
Journal of Agricultural and Food Chemistry
Publisher
American Chemical Society
Publication Date
Jan 15, 2014
Volume
62
Issue
2
Pages
468–475
Identifiers
DOI: 10.1021/jf4040749
PMID: 24341797
Source
Medline
Keywords
License
Unknown

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.

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