Onion oil extraction method from onion leave using supercritical carbon dioxide method
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A carbon dioxide and supercritical technology, which is applied in the direction of digestive system, pharmaceutical formulations, medical preparations containing active ingredients, etc., can solve the problems of low extraction efficiency and inability to solve organic solvent residues, etc., to achieve thorough extraction, good development prospects, selective effect
Inactive Publication Date: 2009-06-17
NANJING AGRICULTURAL UNIVERSITY
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However, the extraction efficiency of the current research method is not high and cannot solve the problem of organic solvent residues
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[0027] (1) Raw materials: yellow onion leaves;
[0028] (2) drying: the onion blades are naturally dried;
[0029] (3) pulverizing: the dry onion leaves are pulverized and sieved to get the onion leaf powder with particle size <40 mesh;
[0030] (4) Supercritical CO 2 Extraction: Put 100kg of the dried onion leaves into HA121-50-01 supercritical extraction device (produced by Jiangsu Nantong Huaan Supercritical Extraction Co., Ltd.), adjust the extraction temperature, extraction pressure and extraction time to make it reach the optimum extraction parameter of 37.35°C , the extraction pressure is 27.5MPa, the extraction time is 57.9min, and the onion oil crude extract is directly collected in a brown jar at the outlet of the extraction kettle;
[0031] (5) Post-treatment: evaporate ethanol, extract the crude extract twice with dichloromethane at a volume ratio of 1:1 at 25°C, add activated carbon to remove pigments, and recover dichloromethane at 42°C;
[0032] (6) with anhy...
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Abstract
The invention relates to a method of extracting onion oil from supercritical carbon dioxide onion leaves, pertaining to the field of agricultural and sideline products waste recycling and processing, which is dedicated to the development and use of onion oil. Its process includes: naturally drying and crushing the mature onion leaves, and performing supercritical carbon dioxide extraction, wherein, the extraction temperature is adjusted to 35-45 DEG C, the extraction pressure is 20-30MPa, the time is 30-60min, so as to get the onion oil with a yield ratio of 3.30-3.42 per mill. The present invention provides a method of extracting onion oil by taking the onion leaves as new resources, which has advantages of strong operability, security, less destruction of active ingredients, higher yield and good reproducibility.
Description
1. Technical field [0001] The invention relates to a method for extracting onion oil from onion leaves with supercritical carbon dioxide, belongs to the field of recovery and processing of agricultural by-products, and is specially used for the development and utilization of new onion leaf resources. 2. Background technology [0002] Onion (Allium Cepa L.), also known as onion, jade onion or bulb onion, is a worldwide vegetable of the genus Allium in the Liliaceae family. It is known as the "Queen of Vegetables" in Europe. It is rich in nutrients, including protein, sugar , crude fiber and calcium, phosphorus, iron, selenium, carotene, thiamine, riboflavin, niacin, ascorbic acid and other nutrients, have a wide range of medicinal value, medical proof onion is good for eyesight, and has a diuretic effect , phlegm, appetizing, anti-inflammatory sterilization, blood pressure stabilization, reducing vascular fragility and other effects. [0003] However, in recent years, the re...
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