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Method extracting onion oil by super-critical carbon dioxide

A carbon dioxide and supercritical technology, applied in the direction of fat oil/fat production, fat production, etc., can solve the problems of low yield, poor quality of onion oil, and more damage to active substances, and achieve strong selectivity, less damage, and inhibition of thermal decomposition Effect

Inactive Publication Date: 2007-07-25
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem: the purpose of the present invention is to provide a method for extracting onion oil with supercritical carbon dioxide, so as to solve the disadvantages of active substance damage, low yield and poor quality of onion oil extracted by prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Raw material: yellow onion;

[0025] (2) Drying: freeze-dry the onion or dry it naturally below 60°C;

[0026] (3) Supercritical CO 2 Extraction: put the dried onion sample into HA420-40-96 type supercritical extraction device (produced by Jiangsu Nantong Huaan Supercritical Extraction Co., Ltd.), adjust extraction temperature, extraction pressure and CO 2 The flow rate makes it reach the best extraction parameters. The extraction temperature is 38°C, the extraction pressure is 19Mpa, CO 2 The flow rate is 150kg / h, and the time is 3-4 hours, and the onion oil crude extract is directly collected in a brown jar at the outlet of the extraction kettle;

[0027] (4) Post-treatment: the crude extract was extracted twice with dichloromethane at a volume ratio of 1:1 at 25°C, and the dichloromethane was recovered at 42°C;

[0028] (5) with anhydrous Na 2 SO 4 The remaining water is removed to obtain pure onion oil.

[0029] The extracted onion oil is a light yellow, c...

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Abstract

A onion oil-extracting process by supercritical CO2 is carried out by: drying and chopping onions, then extracting with CO2 at the conditions of 38deg.C, 19MPa,150kg / h to obtain onion oil. Its rate of purity is above 99%.Yield is 0.31-0.39%. Operation is friendly and safety. Otherwise, lost of active ingredient is less and yield is high.

Description

1. Technical field [0001] The invention adopts a method for extracting onion oil with supercritical carbon dioxide, belongs to the field of agricultural and sideline product processing, and is specially used for deep processing of onions. 2. Technical background [0002] Onion (Allium Cepa L.), also known as bulb onion, onion or jade onion, is a plant of the genus Allium in the Liliaceae family and is a worldwide vegetable. Allium plants have long been considered to have a variety of medicinal activities, among which garlic, onion and scallions are the most favored by researchers. The medicinal value of garlic has been widely confirmed, and medicines and health products such as fungicides and allicin have been developed one after another. Onion is known as "the queen of dishes" in European and American countries, and its medicinal value has a good development prospect. Fresh onions contain a large amount of minerals, vitamins, amino acids and trace elements, as well as vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11B1/10
Inventor 侯喜林汪舟明王建军孙智华
Owner NANJING AGRICULTURAL UNIVERSITY