Supercritical CO2 extraction of ginger oleoresin
Supercritical CO2 extraction of ginger oleoresin extraction process data from ginger:
Pulverization degree: 120 mesh
Extraction pressure: 35 MPa
Extraction temperature: 35°C
Extraction time: 90 min
The single-factor test and orthogonal test were used to discuss the process conditions that affect the supercritical CO2 extraction of ginger oleoresin, and the optimal extraction process parameters were determined: fresh ginger dried at 50 ° C in far-infrared, crushed through a 120 mesh screen, 35MPa Extracted at 35 ℃ for 2.5h, the mass extraction rate was 6.08%, and the curcumin extraction rate was 2.78%.
Antioxidant activity experiments show that the extract has a strong ability to scavenge DPPH free radicals, and the scavenging ability has a clear dose-effect relationship with concentration.
Ginger is an important spice seasoning worldwide, and it is also a traditional medicinal and food plant in Asia. Because of its sweating, relieving pain, analgesic and anti-inflammatory effects, and its unique spicy flavor, it has won the favor of the people. It is by far the most important rhizome spice in international trade. The annual world trade volume exceeds 20,000 tons. China's annual export volume accounts for more than 40% of the world's total export volume. Ginger oleoresin is a mixture of ginger essential oil and gingerol extracted from ginger. The aroma of ginger depends on ginger essential oil. The characteristic spicy flavor mainly comes from gingerol.
Turmeric rhizome contains curcumin and turmeric essential oil. Curcumin includes: curcumin, demethoxycurcumin, and nordimethoxycurcumin; and the turmeric essential oil is mainly sesquiterpene (about 58%), and others include curcumene and d-α-phellandrene , D-pinene, borneol. Turmeric volatile oil and curcumin vary greatly depending on the origin and collection time. In addition, it also contains oleovesin, arabinose, fructose, glucose, fatty oil and the like.
Studies have shown that ginger oleoresin has a strong anti-oxidant and scavenging effect on free radicals. It has a wide range of applications in food, medicine, cosmetics and health products industries. Its function is closely related to the content of gingerol.
Fresh ginger slices are dried at 50 ° C to 13% water content, crushed to a particle size of less than 2.5mm, 1000g is placed in an extraction kettle, and CO2 with a purity of 99.5% is pressed in by a high-pressure plunger pump at a flow rate of 5m3 / h. After extraction at 35 MPa and 50 ° C for 1.5 hours, 58 g of ginger oleoresin was isolated.