Phenolic content and antioxidant activity of extracts from whole buckwheat (Fagopyrum esculentum Möench) with or without microwave irradiation

George E. Inglett, Devin J. Rose, Diejun Chen, David G. Stevenson, Atanu Biswas

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

The purpose of this study was to extract phenolic compounds and antioxidant activity from buckwheat with water, 50% aqueous ethanol, or 100% ethanol using microwave irradiation or a water bath for 15 min at various temperatures (23-150 °C). Phenolic content of extracts increased with increasing temperature. In general, phenolic contents in microwave irradiated extracts were higher than those heated with a water bath. The highest phenolic content, 18.5 ± 0.2 mg/g buckwheat, was observed in the extract that was microwave irradiated in 50% aqueous ethanol at 150 °C. The highest antioxidant activities, 5.61 ± 0.04-5.73 ± 0.00 μmol Trolox equivalents/g buckwheat, were found in the 100% ethanol extracts obtained at 100 and 150 °C, independent of heat source. These results indicate that microwave irradiation can be used to obtain buckwheat extracts with higher phenolic content and similar antioxidant activity as extracts heated in a water bath.

Original languageEnglish (US)
Pages (from-to)1216-1219
Number of pages4
JournalFood Chemistry
Volume119
Issue number3
DOIs
StatePublished - Apr 1 2010
Externally publishedYes

Keywords

  • Browning
  • Ethanol
  • Health
  • Heat
  • Nutraceutical
  • Rutin

ASJC Scopus subject areas

  • Analytical Chemistry
  • Food Science

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