Method for preparing ginkgo leaf extract powder using supercritical liquid desiccation and device thereof

Abstract

The invention discloses a method for preparing ginkgo leaf extract powder by drying supercritical fluid and a device thereof. The method comprises the following steps: placing alcoholic solution of ginkgo leaf extract without impurity into a sealed dry chamber cylinder body, and then introducing carbon dioxide into the solution at a flow speed of 20 to 45 liters per hour, wherein temperature of the carbon dioxide is between 0 and 5 DEG C; controlling pressure of the dry chamber cylinder body at 10 to 30MPa and temperature of between 35 and 75 DEG C; and after the carbon dioxide becomes stablesupercritical fluid, continuously displacing and drying the fluid for 4 to 8 hours to finally obtain light-yellow dry finished powder of the ginkgo leaf extract. The device comprises a carbon dioxidesteel bottle, a gas-liquid separation container, a gas cooling unit, a transition container, a carbon dioxide transfer pump, a heater, the dry chamber cylinder body, a first-stage separation cylinderbody, a second-stage separation cylinder body, valves and pipelines, and the components are mutually connected through the valves and the pipelines. The content of flavone in obtained power is more than 25 weight percent, the alcoholic solution in the extract can be reclaimed, and the carbon dioxide can also be recycled.

Description

technical field [0001] The invention relates to a drying method of ginkgo leaf extract, in particular to a method for preparing ginkgo leaf extract powder by drying with supercritical fluid. Background technique [0002] Ginkgo biloba is a deciduous tree with a height of 40m. There are two types of branches, long and short. The leaves are clustered on short branches and alternate on long branches. The leaves are fan-shaped, 4-8cm long, 5-10cm wide, with 2 shallow lobes in the middle of the apex, cuneate base, parallel veins and forked branches. "Compendium of Materia Medica" records that its leaves have high medicinal value. The nature and flavor are sweet, bitter and astringent, and enter the lung and kidney meridians. The components of Ginkgo biloba include unique flavonoids, terpenes and ginkgolic acid that can cause allergic reactions. These ginkgo flavonoid-glycoside components have powerful antioxidant and free radical capabilities. Research shows that Ginkgo biloba...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the disadvantages that the active ingredients in the high-temperature drying method are easily destroyed, and the supercritical drying is not easy to control, and the waste of carbon dioxide is serious, and proposes a method and device for preparing ginkgo leaf extract powder by supercritical fluid drying, which has a simple method , low cost, and does not destroy the advantages of active ingredients

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