Comparison of blood profiles of γ-Oryzanol and ferulic acid in rats after oral intake of γ-Oryzanol

Takumi Kokumai, Junya Ito, Eri Kobayashi, Naoki Shimizu, Hiroyuki Hashimoto, Takahiro Eitsuka, Teruo Miyazawa, Kiyotaka Nakagawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

γ-Oryzanol (OZ), a bioactive phytochemical abundant in cereals such as rice, has been reported to be mainly hydrolyzed to ferulic acid (FA) in the body. Meanwhile, in our previous study, we revealed that a part of OZ is absorbed into the body and exists in its intact form. However, the comprehensive absorption profile of OZ and its metabolites (e.g., FA) after OZ intake has not been fully elucidated yet. Therefore, in this study, we measured the concentrations of OZ, FA, and FA conjugates (i.e., FA sulfate and glucuronide) in the blood of rats with the use of HPLC-MS/MS after a single oral administration of 300 µmol/kg body weight of rice bran OZ (RBOZ). As a result, intact OZ along with FA and FA conjugates existed in the blood, which implied that these constituents may all contribute to the physiological effects under OZ intake. Additionally, when an equimolar amount of FA (300 µmol/kg body weight) was administered, it was found that the absorption profile of FA was significantly different from that when RBOZ was administered.

Original languageEnglish
Article number1174
JournalNutrients
Volume11
Issue number5
DOIs
Publication statusPublished - 2019 May

Keywords

  • Absorption and metabolism
  • Ferulic acid
  • HPLC-MS/MS
  • Rice bran
  • γ-oryzanol

ASJC Scopus subject areas

  • Food Science
  • Nutrition and Dietetics

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