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A kind of extraction method of azadirachtin

An extraction method and azadirachtin technology are applied in the field of extracting azadirachtin from neem seed kernels, which can solve the problems of poor stability of azadirachtin, complicated process of azadirachtin, easy decomposition and the like, and achieve ideal purity , shorten the extraction time and avoid the effect of decomposition

Active Publication Date: 2017-08-11
CHANGZHOU MYSUN BIOLOGICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problems to be solved by the present invention are: the stability of azadirachtin is not good, and it is easy to decompose; the process of extracting azadirachtin at low temperature is complicated and the efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) At room temperature (25°C), add peeled commercially available neem kernels and sodium abietate to deionized water to obtain a pre-extraction system, wherein, peeled neem kernels, sodium abietate, deionized The weight ratio of water is 6:0.5:50;

[0025] (2) After heating the pre-extraction system obtained in step (1) to 85°C at a heating rate of 2°C / min, use a cleaned soybean milk machine to cut with a high-speed blade at a cutting and stirring rate of 2500 rpm Azadirachtin is extracted for 30 minutes by stirring and pulverizing the peeled neem seeds;

[0026] (3) After the extraction is completed, the system is cooled to normal temperature (25° C.), and cyclohexane having the same volume as the deionized water in step (1) is added and fully stirred, then left to stand and layered to obtain a water phase and an oil phase;

[0027] (4) Add (with the water phase) equal volumes of liquid hydrocarbon n-hexane to the water phase obtained in step (3), and in the process ...

Embodiment 2

[0030] (1) At room temperature (25°C), add peeled commercially available neem kernels and sodium abietate to deionized water to obtain a pre-extraction system, wherein, peeled neem kernels, sodium abietate, deionized The weight ratio of water is 5:0.4:50;

[0031] (2) After heating the pre-extraction system obtained in step (1) to 85°C at a heating rate of 4°C / min, use a cleaned soymilk machine to cut with a high-speed blade at a cutting and stirring rate of 2500 rpm Azadirachtin is extracted for 30 minutes by stirring and pulverizing the peeled neem seeds;

[0032] (3) After the extraction is completed, the system is cooled to normal temperature (25° C.), and cyclohexane having the same volume as the deionized water in step (1) is added and fully stirred, then left to stand and layered to obtain a water phase and an oil phase;

[0033] (4) Add (with the water phase) an equal volume of liquid hydrocarbon n-hexane to the aqueous phase obtained in step (3), and in the process o...

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Abstract

The present invention relates to the field of preparation of natural plant extracts, and particularly relates to a method of extracting Azadirachtin from neem seeds. The method comprises: first adding peeled neem seeds and sodium rosinate to deionized water, and extracting Azadirachtin by cutting, stirring and crushing the peeled neem seeds via a high-speed blade under heating; upon completion of extraction, adding cyclohexane and stirring well, then resting to allow separation of layers, adding a liquid hydrocarbon compound to the obtained aqueous phase, and applying ultrasonic wave during a stirring and mixing process, filtering to obtain a precipitate at the bottom of the container and drying, so as to obtain Azadirachtin extracts. The present invention provides an Azadirachtin extraction process at a higher temperature and shortens the extraction time, while Azadirachtin is obtained with ideal purity and a high extraction rate.

Description

technical field [0001] The invention belongs to the field of preparation of natural plant extracts, in particular to a method for extracting azadirachtin from neem seeds. Background technique [0002] Neem (Azadirachta indica A. Juss) is a plant of the Meliaceae family, which is a fast-growing deciduous tree growing in the tropics and subtropics. Azadirachtin is a kind of highly oxidized citrin extracted from the bark and kernel of neem, which has a strong insecticidal effect. Azadirachtin insecticides have the characteristics of broad spectrum, high efficiency, low toxicity, no residue, no toxic and side effects on humans and animals, safe to natural enemies of pests, and not easy to produce drug resistance. They are currently one of the most widely researched and used biological pesticides at home and abroad. 1. It has been listed as a pollution-free pesticide recommended by the Green Food Office of the State Council. [0003] Due to the large amount of vegetable oil con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D519/00
CPCC07D519/00
Inventor 纪俊玲王东方彭勇刚黄险峰朱孝霖
Owner CHANGZHOU MYSUN BIOLOGICAL MATERIALS
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