A high-voltage pulsed electric field-assisted subcritical fluid extraction method for rice bran oil

A high-voltage pulsed electric field and subcritical fluid technology, which is applied in the fields of edible oil/fat, fat oil/fat production, fat oil/fat refining, etc., can solve the problems of easy deterioration of raw materials and difficult refining, and achieve good quality and shorten the refining process Effect

Active Publication Date: 2015-11-25
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for extracting rice bran oil with high-efficiency, environmental protection and simple process with the assistance of subcritical fluid by high-voltage pulsed electric field, so as to overcome the problems of easily deteriorating raw materials and difficult refining in the existing rice bran oil production process, The obtained product meets the secondary standard of rice bran oil extracted from GB19112-2003

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031](1) Weigh 50g of fresh rice bran, crush it with a pulverizer and pass it through a 30-mesh sieve, measure 1000mL of deionized water and rice bran to prepare a 5w / v% suspension; Pulse electric field treatment, electric field intensity 30kV / cm, pulse time 200μs, pulse width 2μs, pulse frequency 400Hz, suspension flow rate 1mL / s; (3) Add 50mL absolute ethanol to the suspension after high-voltage pulse electric field treatment and mix well , to obtain a mixed solution; (4) Put the obtained mixed solution into a subcritical still for extraction, the extraction temperature is 160°C, the extraction pressure is 7MPa, and the extraction time is 15min; (5) The extract is filtered with a Buchner funnel at 0.08MPa Remove the rice bran meal, and then centrifuge the filtrate at 3000r / min for 8min; (6) Take the upper oil and distill it under reduced pressure in a rotary evaporator (vacuum pressure 0.08MPa, precipitation temperature 36°C, precipitation time 8min) to remove ethanol , to ...

Embodiment 2

[0034] (1) Weigh 60g of fresh rice bran, crush it with a grinder and pass it through a 30-mesh sieve, measure 1000mL of deionized water and rice bran to prepare a 6w / v% suspension; Pulse electric field treatment, electric field intensity 40kV / cm, pulse time 150μs, pulse width 3μs, pulse frequency 300Hz, suspension flow rate 1.5mL / s; (3) Add 60mL absolute ethanol to the suspension after high-voltage pulse electric field treatment and mix (4) Add the obtained mixture into a subcritical distillation kettle for extraction, the extraction temperature is 170°C, the extraction pressure is 6.5MPa, and the extraction time is 12min; (5) Use a Buchner funnel to filter the extract at 0.09MPa to remove the rice bran Then centrifuge the filtrate at 4000r / min for 9min; (6) Take the upper layer of oil and distill it under reduced pressure in a rotary evaporator (vacuum pressure 0.09MPa, precipitation temperature 38°C, precipitation time 9min) to remove ethanol to obtain 10.9g of crude rice br...

Embodiment 3

[0037] (1) Weigh 80g of fresh rice bran, crush it with a pulverizer and pass it through a 30-mesh sieve, measure 1000mL of deionized water and rice bran to prepare an 8w / v% suspension; Pulse electric field treatment, electric field strength 50kV / cm, pulse time 100μs, pulse width 4μs, pulse frequency 200Hz, suspension flow rate 2mL / s; (3) add 80mL of absolute ethanol (including , 15.2mL is collected by cooling in Example 1, 17.8mL is collected by cooling in Example 2) mix well; (4) add the obtained mixture into a subcritical still for extraction, the extraction temperature is 180°C, the extraction pressure is 6MPa, and the extraction The time is 10min; (5) Use a Buchner funnel to filter the extract to remove the rice bran meal at 0.1MPa, and then centrifuge the filtrate at 5000r / min for 10min; (6) Take the upper layer of oil and distill it under reduced pressure in a rotary evaporator ( Vacuum pressure 0.1MPa, precipitation temperature 40°C, precipitation time 10min) to remove ...

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Abstract

The invention relates to a method of extracting rice bran oil by virtue of subcritical fluid extraction assisted by a high-voltage pulsed electric field. The method comprises the following steps: dosing; treating in the high-voltage pulsed electric field; preparing a liquid; carrying out subcritical fluid extraction; filtering and centrifugalizing; carrying out reduced pressure distillation; refining grease. The rice bran crude oil extraction ratio is 91.3-94.9%, the acid value is 2.3-2.7mgKOH / g, and the refining ratio of the obtained product rice bran oil is 82.6-83.8%. The main composition of fatty acid comprises 14.9-15.3% of palmitic acid, 42.5-43.8% of oleic acid and 35.9-37.2% of linoleic acid. The acid value is 0.26-0.28mgKOH / g, the peroxide value is 0.4-0.8mmol / kg, and the color and luster is Y32R3.5-Y34R3.5. The oil is good in quality and meets the secondary standard of leached product rice bran oil in GB19112-2003. The method provided by the invention is efficient and environment-friendly, simple in process and suitable for scaled production.

Description

technical field [0001] The invention relates to a method for preparing rice bran oil, in particular to a method for extracting rice bran oil by a subcritical fluid assisted by a high-voltage pulse electric field. Background technique [0002] Rice bran oil is rich in a variety of unsaturated fatty acids needed by the human body. Among them, the ratio of linoleic acid to oleic acid is about 1:1.1, which is close to the optimal ratio recommended by WHO, and its nutritional value is among the best in edible oils. In addition, rice bran oil is also rich in physiologically active substances such as oryzanol, vitamin E, and sitosterol, and is known as "nutrition and health care oil". [0003] At present, the production methods of rice bran oil are mainly pressing, leaching and supercritical fluid extraction. However, the pressed oil has high acid value, and the leaching method has problems such as solvent residues, and the crude rice bran oil obtained by the two methods needs to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11B1/10C11B1/04C11B3/10C11B3/06C11B3/12A23D9/02
Inventor 吴伟林亲录蔡勇建吴晓娟吴跃梁盈付湘晋
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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