Method for separating ginger essential oil from gingerol-rich oleoresin ginger through low-pressure supercritical CO2 extraction

Abstract

The invention relates to a method for separating ginger essential oil from gingerol-rich oleoresin ginger through low-pressure supercritical CO2 extraction. The method comprises the steps of extracting ginger powder with high-pressure low-temperature CO2 fluid under low extraction pressure and at low temperature to prepare first CO2 extract liquid in which effective ingredients of ginger are dissolved; performing heat exchange and heating on the first CO2 extract liquid and separating directly to obtain oleoresin ginger resin containing extracts of full ingredients of ginger; carrying out extraction, heat exchange and heating, rectification and separation on the oleoresin ginger resin containing extracts of full ingredients of ginger sequentially to obtain high-purity ginger essential oil and gingerol-rich oleoresin ginger respectively, thereby achieving effective separation of the two effective ingredients. According to the method, while the extraction temperature and the extraction pressure are effectively reduced, the two effective ingredients, gingerol-based oleoresin ginger and ginger essential oil, in ginger are effectively separated, and finally, high-purity ginger essential oil and gingerol-rich oleoresin ginger are prepared.

Description

Technical field [0001] The invention belongs to the technical field of extraction and separation of natural products, and specifically relates to a low-pressure supercritical CO 2 A method for extracting and separating ginger essential oil and ginger oleoresin rich in gingerol. Background technique [0002] Ginger is the rhizome of Zingiberofficinale Rosc. (Zingiberofficinale Rosc.). Traditional Chinese medicine believes that ginger is pungent and hot; it returns to the spleen, stomach, heart, and lung meridians. , Used for wrist and abdomen cold pain, vomiting and diarrhea, cold limbs, weak pulse, phlegm, asthma and cough, modern pharmacological research shows that ginger has antipyretic, analgesic, anti-inflammatory, anti-heart failure, antibacterial, antiemetic, Promote the secretion of bile, protect the cardiomyocytes from hypoxia and hypoglycemia injury, anti-platelet aggregation and other pharmacological activities. Ginger is also a well-loved and widely used natural spicy...

AI Technical Summary

Problems solved by technology

[0007] However, prior art using supercritical CO 2 The method of extracting and separating the effective components of ginger requires extraction at a higher extraction pressure of 7Mpa to 45Mpa and a higher extraction temperature of 32°C-80°C to obtain the extract, and then perform multi-stage separation to obtain gingerols-gingerol Oleoresin and ginger essential oil to finally produce gingerols - the content of gingerol in ginger oleoresin is low, only 11-14wt%, and due to the high extraction temperature used, it will cause damage to heat-sensitive components in natural products , thus affecting the yield and purity of active ingredients

In addition, because the extraction system needs to withstand high pressure, the equipment is expensive and the investment is huge, which is difficult for ordinary enterprises to bear; and the overall scale of the extraction system is generally relatively small, making it difficult to achieve large-scale extraction

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