Determination of antioxidant components in rice bran oil extracted by microwave-assisted method

I. G. Zigoneanu, Lynda Williams, Z. Xu, C. M. Sabliov

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

Rice bran oil was extracted by microwave-assisted extraction with isopropanol and hexane using a solvent-to-rice bran ratio of 3:1 (w/w). The experiments were done in triplicate at 40, 60, 80, 100, and 120 °C with a total extraction time of 15 min/sample. The oil components were separated by normal-phase HPLC and quantified with a fluorescence detector. The radical scavenging capability of the oil was tested with DPPH and was expressed as μmol Trolox Equivalent Antioxidant Activity. The increase in total vitamin E with temperature from 40 to 120 °C was 59.63% for isopropanol and 342.01% for hexane. Isopropanol was the best solvent for the extraction of γ-tocopherol and γ-tocotrienol as compared with hexane for both microwave-assisted and conventional solvent extraction. Isopropanol was better for oil yield extraction at high temperatures. Samples extracted with isopropanol at 120 °C had higher antioxidant activity. No differences in oil yield, total vitamin E, and antioxidant activity of oil was noticed between the two methods (microwave-assisted and solvent extractions), at 40 °C. No degradation of α-tocopherol was noticed during the process.

Original languageEnglish (US)
Pages (from-to)4910-4918
Number of pages9
JournalBioresource Technology
Volume99
Issue number11
DOIs
StatePublished - Jul 2008
Externally publishedYes

Fingerprint

rice bran oil
2-Propanol
Microwaves
Antioxidants
isopropyl alcohol
antioxidant
Oils
rice
antioxidants
Hexanes
oil
oils
Hexane
Tocopherols
hexane
Solvent extraction
Vitamin E
antioxidant activity
Vitamins
vitamin

Keywords

  • Antioxidant activity
  • Degradation
  • Microwave extraction
  • Rice bran oil
  • Vitamin E

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Food Science
  • Process Chemistry and Technology
  • Applied Microbiology and Biotechnology

Cite this

Determination of antioxidant components in rice bran oil extracted by microwave-assisted method. / Zigoneanu, I. G.; Williams, Lynda; Xu, Z.; Sabliov, C. M.

In: Bioresource Technology, Vol. 99, No. 11, 07.2008, p. 4910-4918.

Research output: Contribution to journalArticle

Zigoneanu, I. G. ; Williams, Lynda ; Xu, Z. ; Sabliov, C. M. / Determination of antioxidant components in rice bran oil extracted by microwave-assisted method. In: Bioresource Technology. 2008 ; Vol. 99, No. 11. pp. 4910-4918.
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