Method for extracting and purifying vitexin and isoviextin from cajanus cajan branches and leaves

Abstract

The present invention relates to a method for extracting and purifying functional components of Chinese herbal medicine. The purpose is to provide a simple, safe, economical and efficient method for extracting and purifying monomeric compounds vitexin and isovitexin from pigeonpea branches and leaves. The technical scheme is: using fresh or dried branches and leaves of pigeonpea as raw materials, using homogenate extraction technology, ultrasonic assisted extraction technology, ultrasonic oscillation flocculation technology, negative pressure cavitation suspension liquid extraction technology, macroporous adsorption resin enrichment technology, ODS -C18 reverse phase medium pressure silica gel column chromatography technology combined with low temperature crystallization and recrystallization technology to obtain vitexin and isovitexin with a purity of over 90%, and the extraction rates are over 0.17% and 0.13% respectively . The raw materials used in the invention are fresh or dried pigeonpea branches and leaves which are mostly discarded in agricultural production, which neither destroys the ecological balance of plants nor affects agricultural production, and can obtain high-purity pigeonpea functional components. Moreover, the method is simple and easy to implement after extraction, preliminary impurity removal and repurification, and the loss of the target compound is small. It is suitable for industrial applications and is of great significance to industrial production.

Description

technical field [0001] The invention relates to a method for separating and purifying functional components from plants, in particular extracting and purifying vitexin and isovitexin from fresh or dry branches and leaves of pigeonpea. Background technique [0002] Pigeon pea [Cajanus cajan (L.) Millsp.] is an annual or perennial woody plant and evergreen shrub of the genus Fabaceae. Also known as pigeon beans, tree soybeans, etc., it is a folk medicine. It has cooling, heat-reducing, detoxifying, analgesic, hemostatic, antibacterial and anti-inflammatory effects. It is used in folks to treat trauma, burns, infections, bedsores, antibacterial and anti-inflammatory, etc. (Liu Zhongqiu et al., 1998; Sun Shaomei et al., 1995). In addition, pigeonpea extract preparations are used in India, Brazil, Cuba, Mexico, South Africa and other countries to treat colds, bronchitis, measles, dysentery, hepatitis, skin diseases, burns, ulcers, tumors and other diseases (Abbiw DK., 1990; Duk...

AI Technical Summary

Problems solved by technology

The traditional purification process is long and the loss of the target compound is large. Multiple silica gel column chromatography is used. The operation steps are numerous and the eluent is mainly toxic and expensive reagents such as chloroform, acetone, and ethyl acetate.

In the Chinese patent "Rapid Preparation Method of Several High-purity Medicinal Substances in Patrinia dahliae" (publication number CN1683386), isovitexin was prepared by traditional liquid-liquid extraction, column chromatography and high-efficiency countercurrent chromatography. Long, large amount of organic solvents, and restricted by instruments and equipment

Lin Li (1999) used traditional column chromatography to separate vitexin and isovitexin, which took a long time and the yield was low

[0006] In summary, in the process of using plant resources to separate and purify vitexin and isovitexin, the main influencing factors are the backward extraction process and the widespread loss of vitexin and isovitexin in the process of raw material treatment and separation , The purification process is long, which increases the cost

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