Preparation method and application of lotus leaf extract

Abstract

The invention provides a preparation method and application of a lotus leaf extract. The preparation method comprises the following steps that (1), a lotus leaf medicinal material is weighed, water is added for reflux extraction according to a solid-liquid ratio of the lotus leaf medicinal material to the water of 1g to 15-30mL, extracting is carried out for 1-3 times, filtering is carried out to obtain a total flavone extracting solution, and the total flavone extracting solution is concentrated to 0.5-2 times of the weight of the lotus leaf medicinal material; (2), an acid solution is added into the concentrated solution, the adding amount of the acid solution accounts for 1%-6% of the mass of the concentrated solution, and heating reflux hydrolysis is carried out for 0.5-5 hours; (3), the hydrolysis solution is filtered while the hydrolysis solution is hot, and filtrate is decolorized to obtain a decolorized solution; and (4), the decolorized solution is dried to obtain the lotus leaf extract. According to the preparation process, an acid hydrolysis method is adopted, flavonoid substances of the lotus leaves are hydrolyzed to obtain flavonoid aglycones, and the anti-oxidation effect of the product is improved; and in addition, a decolorizing process is adopted, the decolorized product is light in color, and the color is not obviously changed in the placement process.

Description

technical field [0001] The invention belongs to the technical field of plant extraction, and in particular relates to a preparation method and application of lotus leaf extract. Background technique [0002] The distribution of lotus root in my country is very wide, and its cultivation area is between 9 million and 11 million mu. It is mainly distributed in Anhui, Hubei, Hunan, Guangxi, Guangdong, Jiangxi, Fujian, Jiangsu, Zhejiang, Shandong, Hebei and other provinces. According to the normal planting conditions Calculated, one mu of lotus root pond can produce about 300 kilograms of dried lotus leaves, and the current dried lotus leaves on the market are about 15 yuan / kg. If calculated, the lotus leaves in one mu of lotus root pond can be used reasonably , You should be able to increase your income by about 4,500 yuan a year. Nevertheless, the utilization rate of my country's lotus leaf resource is very low, less than 1% of my country's lotus leaf output. Every year, it can...

AI Technical Summary

Problems solved by technology

In terms of liquid raw materials, I learned about a cosmetic raw material that uses 40% butanediol as a solvent and 1.5-3.5% lotus leaf extract powder to dissolve and mix. The main functional ingredient is flavonoids. This raw material has been certified by cosmos, and its Efficacy, but the raw material of the extract has a dark color, and the color will gradually become darker after the preparation of the finished cosmetic product, and the price is expensive

The current market products are prepared from the total flavonoids extracted from lotus leaves, or the flavonol glycoside macroporous resin contained in lotus leaves is processed and purified in multiple steps to prepare products; Continued darkening affects the application of raw materials; or there are many process steps, high preparation costs, and poor economic benefits. At the same time, the relationship between product efficacy and flavonoids is studied in depth, which limits the development and application of lotus leaf extract

Images