The concentrations of tocols and γ-oryzanol compounds in rice bran oil obtained by fractional extraction with supercritical carbon dioxide

Sung Won Yoon, Young Gil Pyo, Junsoo Lee, Jeom Sig Lee, Byung Hee Kim, In-Hwan Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Rice bran oil (RBO) is a good source of several commercially important bioactive phytochemicals, such as tocols (i.e. tocopherols and tocotrienols) and ferulic esters of sterols (i.e. γ-oryzanol). The aims of the present study were to examine the effects of different pressure and temperature combinations on the fractional extraction of RBO using supercritical carbon dioxide (SC-CO2) and to assess the levels of tocols homologues and γ-oryzanol components in the resulting oil fractions. Fractional extraction of rice bran oil was performed using SC-CO2 at either 27.6 or 41.4 MPa and either 40 or 60°C. The effects of the four different pressure and temperature combinations on the levels of seven tocols homologues (a-, b-, g- and d-tocopherol and a-, g- and d-tocotrienol) and the four major components of γ-oryzanol in the resulting oil fractions were investigated. Superior extraction efficiency was obtained using the higher pressure of 41.4 MPa. The tocols (particularly a-tocopherol and a-tocotrienol) were recovered early in the extraction process, while the γ-oryzanol compounds were obtained in the later stages. With regard to SC-CO2 extraction, tocols are more soluble than γ-oryzanol components, a-tocopherol is the most soluble of the tocols and the four g-oryzanol components all have similar solubilities. Valuable data on solubilities of tocols homologues in SC-CO2 were provided from present study.

Original languageEnglish
Pages (from-to)47-53
Number of pages7
JournalJournal of Oleo Science
Volume63
Issue number1
DOIs
Publication statusPublished - 2014 Jan 21

Fingerprint

Tocotrienols
Tocopherols
Carbon Dioxide
Carbon dioxide
Solubility
Pressure
Esters
Oils
rice bran oil
gamma-oryzanol
Temperature
Phytochemicals
Sterols

Keywords

  • γ-oryzanol
  • Rice bran oil
  • Supercritical carbon dioxide
  • Tocols
  • Tocopherol
  • Tocotrienol

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

The concentrations of tocols and γ-oryzanol compounds in rice bran oil obtained by fractional extraction with supercritical carbon dioxide. / Yoon, Sung Won; Pyo, Young Gil; Lee, Junsoo; Lee, Jeom Sig; Kim, Byung Hee; Kim, In-Hwan.

In: Journal of Oleo Science, Vol. 63, No. 1, 21.01.2014, p. 47-53.

Research output: Contribution to journalArticle

Yoon, Sung Won ; Pyo, Young Gil ; Lee, Junsoo ; Lee, Jeom Sig ; Kim, Byung Hee ; Kim, In-Hwan. / The concentrations of tocols and γ-oryzanol compounds in rice bran oil obtained by fractional extraction with supercritical carbon dioxide. In: Journal of Oleo Science. 2014 ; Vol. 63, No. 1. pp. 47-53.
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N2 - Rice bran oil (RBO) is a good source of several commercially important bioactive phytochemicals, such as tocols (i.e. tocopherols and tocotrienols) and ferulic esters of sterols (i.e. γ-oryzanol). The aims of the present study were to examine the effects of different pressure and temperature combinations on the fractional extraction of RBO using supercritical carbon dioxide (SC-CO2) and to assess the levels of tocols homologues and γ-oryzanol components in the resulting oil fractions. Fractional extraction of rice bran oil was performed using SC-CO2 at either 27.6 or 41.4 MPa and either 40 or 60°C. The effects of the four different pressure and temperature combinations on the levels of seven tocols homologues (a-, b-, g- and d-tocopherol and a-, g- and d-tocotrienol) and the four major components of γ-oryzanol in the resulting oil fractions were investigated. Superior extraction efficiency was obtained using the higher pressure of 41.4 MPa. The tocols (particularly a-tocopherol and a-tocotrienol) were recovered early in the extraction process, while the γ-oryzanol compounds were obtained in the later stages. With regard to SC-CO2 extraction, tocols are more soluble than γ-oryzanol components, a-tocopherol is the most soluble of the tocols and the four g-oryzanol components all have similar solubilities. Valuable data on solubilities of tocols homologues in SC-CO2 were provided from present study.

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