Absorption and Elimination of Oat Avenanthramides in Humans after Acute Consumption of Oat Cookies

Oxid Med Cell Longev. 2017;2017:2056705. doi: 10.1155/2017/2056705. Epub 2017 Dec 21.


Background: Avenanthramides (AVA) are a group of diphenolic acids found only in oats that have anti-inflammatory and antioxidant effects. Absorption of AVAs in humans after oral consumption of natural oat flour is unknown.

Objective: To examine the appearance of AVAs in plasma after oral ingestion of oat cookies and estimate key pharmacokinetic parameters.

Methods: Male and female nonobese participants (n = 16) consumed three cookies made with oat flour containing high (229.6 mg/kg, H-AVA) or low (32.7 mg/kg, L-AVA) amounts of AVAs, including AVA-A, AVA-B, and AVA-C. Blood samples were collected at 0, 0.5, 1, 2, 3, 5, and 10 h after ingestion. Plasma total (conjugated and free) AVA concentrations were quantified using UPLC-MS, and pharmacokinetic parameters for each AVA were estimated.

Results: AVAs reached peak concentrations in plasma between 2 and 3 h for the H-AVA group and between 1 and 2 h for the L-AVA group. Maximal plasma concentrations for AVAs were higher in the H-AVA than in the L-AVA group. AVA-B demonstrated a longer half-life and slower elimination rate than AVA-A and AVA-C.

Conclusions: AVAs found naturally in oats are absorbed in the plasma after oral administration in humans. AVA-B has the slowest elimination rate and the longest half-life compared to AVA-A and AVA-C, while AVA-C demonstrated the lowest plasma concentrations. This study is registered with ClinicalTrials.gov identifier NCT02415374.

MeSH terms

  • Adult
  • Antioxidants / pharmacology
  • Feeding Behavior
  • Female
  • Humans
  • Male
  • Middle Aged
  • Young Adult
  • ortho-Aminobenzoates / metabolism*
  • ortho-Aminobenzoates / pharmacology


  • Antioxidants
  • ortho-Aminobenzoates
  • avenanthramide-2C

Associated data

  • ClinicalTrials.gov/NCT02415374