Ohmic heating assisted extraction improves the concentrations of phytochemicals in rice bran oil and unsaponifiable matter

Moongngarm A., . and Loypimai P., . and Fitriati A., . and Moontree T., . Ohmic heating assisted extraction improves the concentrations of phytochemicals in rice bran oil and unsaponifiable matter. pp. 1389-1396. ISSN 2231-7546

The impact of ohmic heating-assisted solvent extraction (OHM-AE) of oil and unsaponifiable matter (USM) from rice bran was investigated for different concentrations of tocols and -oryzanol. Rice bran samples with moisture contents (MC) of 30 and 40 were ohmicallytreated with three levels of electric field strength (E) at 100 150 and 200 V/cm prior to extraction of rice bran oil and USM. Oil and USM prepared by conventional methods (CM) were included as controls. OHM-AE increased the concentration of phytochemicals and antioxidant activity of both rice bran oil and USM. The highest concentrations of -tocopherol -tocotrienol -oryzanol and total phenolic content in the oil and USM were observed in the bran with 30 MC (extracted by OHM-AE at 150 and 200 V/cm) and the bran with 40 MC (extracted at 100 150 and 200 V/cm). Similarly OHM-AE under these conditions yielded higher oil recovery with stronger antioxidant activity than the CM method. This suggested that OHM-AE could be an effective method to extract rice bran offering both increased oil yield and high concentration of phytochemicals.

Full text available from: Official URL: http://www.ifrj.upm.edu.my/26%20(04)%202019/29%20-...

Abstract

The impact of ohmic heating-assisted solvent extraction (OHM-AE) of oil and unsaponifiable matter (USM) from rice bran was investigated for different concentrations of tocols and -oryzanol. Rice bran samples with moisture contents (MC) of 30 and 40 were ohmicallytreated with three levels of electric field strength (E) at 100 150 and 200 V/cm prior to extraction of rice bran oil and USM. Oil and USM prepared by conventional methods (CM) were included as controls. OHM-AE increased the concentration of phytochemicals and antioxidant activity of both rice bran oil and USM. The highest concentrations of -tocopherol -tocotrienol -oryzanol and total phenolic content in the oil and USM were observed in the bran with 30 MC (extracted by OHM-AE at 150 and 200 V/cm) and the bran with 40 MC (extracted at 100 150 and 200 V/cm). Similarly OHM-AE under these conditions yielded higher oil recovery with stronger antioxidant activity than the CM method. This suggested that OHM-AE could be an effective method to extract rice bran offering both increased oil yield and high concentration of phytochemicals.

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Item Type:	Article
AGROVOC Term:	Essential oils
AGROVOC Term:	Plant extracts
AGROVOC Term:	Unsaponifiable materials
AGROVOC Term:	Extraction
AGROVOC Term:	Rice
AGROVOC Term:	Oryza sativa
AGROVOC Term:	Bran
AGROVOC Term:	Heating
AGROVOC Term:	Electric field
AGROVOC Term:	Tocopherols
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8540

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