Supercritical CO2 extraction of grape-kernel oil and method for extracting oligoprotoanthocyanidin by solvent process
A technology for oligomeric proanthocyanidins and grape seed oil, which is applied in the fields of supercritical CO2 extraction of grape seed oil and solvent extraction of oligomeric proanthocyanidins, can solve problems such as unsatisfactory research results, and achieve pure naturalness and good thermal stability. and storage, the effect of no solvent residues
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[0025] Example 1
[0026] The test uses the grape seed powder obtained after crushing and drying as the raw material, using supercritical CO 2 (SC-CO 2 ) Extraction technology, the test device flow is as figure 1 Shown. The supercritical extraction device is mainly composed of the following parts: CO 2 Gas cylinder 1, filter purification device 2, storage tank 3, cold box 4, flow plunger metering pump 5, check valve 6, mixer 7, preheater 8, extraction kettle 9, separator 10, etc.
[0027] Accurately weigh and crush grape seed powder of 20 mesh, 40 mesh and 60 mesh, respectively, and install it in the extractor, and carry out dynamic extraction under the set extraction conditions, and dissolve the supercritical CO of grape seed oil. 2 After decompression and heating, it is separated from the grape seed oil. After the extraction is completed, the extract is accurately weighed, and the oil content in the grape seed powder is measured with a Soxhlet extractor, and then the extraction...
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[0030] Example 2
[0031] The extracts of the actual system will contain a certain amount of water. The carbon dioxide critical fluid is used to extract grease. The moisture content in the material is an important factor affecting the extraction yield. Select the moisture content of 0.5%, 4.5% and 7.7% of grape seeds for extraction. image 3 , Under pressure of 30MPa, temperature of 45℃, CO 2Under the extraction conditions of 10L / h, 40 mesh grape seed oil, collected after 90 minutes, the yields of grape seed oil are 40%, 98.53% and 97.62%, respectively. There are white precipitates in the product when the moisture content is high. Precipitation, and the pipeline has frozen blockage. It can be seen that the moisture content cannot be too high or too low. The extraction rate of grape seed oil is about 4.5% and the quality is the best.
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[0032] Example 3
[0033] Other conditions are constant. As the pressure increases, the oil rate will eventually increase, and the time used will decrease, such as Figure 4 At 30 MPa, the extraction rate reached 98.53% after 90 minutes, 60% and 82% for 20 MPa and 25 MPa, and then reached the maximum after 30 minutes and 60 minutes. This is because as the pressure increases, the supercritical CO 2 With the increase in density, its dissolving power also increases, strengthening the grape seed oil and supercritical CO 2 The solvation improves the extraction efficiency, and the time to reach equilibrium is relatively shortened. But when the pressure is relatively high, the pigment content in the extract will increase and the color will deepen, which will have a certain impact on the quality of the product. Considering the practicability of production, it is better to choose the extraction pressure in the range of 25-30MPa.
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