Preparation method and use of ginkgo-leaf extract

Abstract

The invention discloses a preparation method and an application of a ginkgo leaf extract, wherein the method comprises the following steps of: a) washing and then drying ginkgo leaves; b) crashing and sieving; c) soaking by ethanol; d) oscillating by a ultrasonic cell crasher; e) extracting and filtering; and f) condensing in vacuum and drying. The invention has the advantages of adopting an ultrasonic-assisted extraction method, utilizing the functions of strong vibration, extremely high acceleration, strong cultivation effect, even stirring and the like generated by ultrasonic waves, accelerating the entry of the medicament effective constituents into the solvent, simultaneously avoiding the effect of high temperature on extraction constituents and greatly improving the yield of the extract. In the extract, flavonoids accounts for 36 percent, ginkgo terpene lactones account for over 8 percent while the injurant phenolic acid is less than 3PPM, therefore, the product has high safety. The obtained Ginkgo leaf extract of 4 to 6g is added to each kilogram of feeding stuff, therefore, the animal immune anti-inflammatory action and the production property can be raised by more than 10 percent and 2 to 3 percent respectively.

Description

technical field [0001] The invention relates to a preparation method and application of ultrasonic-assisted ginkgo leaf extract with fast extraction speed, high extraction rate, solvent and energy saving. Background technique [0002] In recent years, the efficacy of Ginkgo biloba extract has attracted more and more people's attention. It can improve the production performance of livestock and poultry, increase the speed of weight gain, improve the feed conversion rate, increase the immune organ index of livestock and poultry, and reduce the blood lipid level of livestock and poultry. . Ginkgo biloba extract has a wide variety of extraction processes, mainly steam distillation, solvent extraction, supercritical fluid extraction, ultrasonic-assisted extraction, enzymatic and microwave methods. Among them, the steam distillation method has a low extraction rate due to the poor selectivity of water to the active ingredients; the residue of the organic solvent in the product in...

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Problems solved by technology

Among them, the steam distillation method has a low extraction rate due to the poor selectivity of water to the active ingredients; the residue of the organic solvent in the product in the solvent extraction method will affect the product quality, and the safety is poor; the supercritical fluid extraction method is due to Large equipment and difficult operation are difficult to use in large-scale industrial production; the enzymatic method cannot remove all impurities in ginkgo leaves due to the specificity of the enzyme; although the application of microwave technology has been developed rapidly in recent years, it is not suitable for rich Extraction of Chinese herbal medicines with volatile or heat-sensitive components