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Method for extracting nimbin

An extraction method, the technology of azadirachtin, applied in the direction of organic chemistry, etc., can solve the problems of direct crushing of neem kernels, failure of the grinder to operate normally, and decomposition of azadirachtin, so as to achieve good fluidity, reduce waste, and improve The effect of extraction rate

Inactive Publication Date: 2007-02-07
JIANGSU QIANGLIN BIO ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Neem seeds contain a large amount of neem oil, so it is very difficult to crush the neem seeds directly, and it is often easy to cause sticky lumps to cause the pulverizer to fail to operate normally, and it is easy to cause the seeds to heat up, resulting in partial decomposition of azadirachtin; in literature reports There is also the method of first pressing to remove the oil and then crushing. Although this can solve the problem of crushing and agglomeration, part of the azadirachtin is dissolved in the pressed oil during the pressing process, and it is easy to cause temperature rise during the pressing process to partially decompose the azadirachtin.

Method used

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Experimental program
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Effect test

Embodiment 1

[0020] A method for extracting azadirachtin, comprising the following steps,

[0021] The first step is to soak the peeled neem kernels with a polar organic solvent 3-5 times the weight of the peeled neem kernels for 6-12 hours,

[0022] In the second step, in the above-mentioned polar organic solvent, a high-speed blade is used to cut, stir and pulverize to extract azadirachtin, and then filter to obtain the extract and filter cake.

[0023] In the third step, the extract is concentrated in vacuum at 10-40° C. to remove the polar organic solvent to obtain the concentrate containing azadirachtin.

[0024] The above-mentioned polar organic solvent is one of alcohol, ketone, ester, ether, nitrile or their mixture, and the proportion of the mixture is any proportion, such as methanol, ethanol, acetone, butanone, ethyl acetate, methyl acetate Esters, methyl tert-butyl ether, acetonitrile, etc. or mixtures thereof.

Embodiment 2

[0026] A method for extracting azadirachtin, soaking and softening the peeled neem kernels for 6-12 hours with a polar organic solvent of 3-5 times the quality of the peeled neem kernels at normal temperature (for example, 20 degrees Celsius or 25 degrees Celsius), Wherein the quality of polar organic solvent can be 3.2 times of peeled neem kernel quality, 4 times, 4.2 times, 4.8 times, soaking time can be 7 hours, 8.5 hours, 9.5 hours, 11 hours, 11.5 hours, then in In the above-mentioned polar organic solvent, a high-speed blade is used to cut, stir and pulverize (soymilk machine can be used, and the rotating speed can be 10000-22000 rpm) to extract azadirachtin, and after filtering, the extract and filter cake are obtained, and 2-5 The polar organic solvent of twice peeled neem seed quality continues to be mechanically stirred at normal temperature (carried out in a soybean milk machine, and the speed of stirring and extracting is 2000-8000 rpm) to extract for 3-5 hours, wher...

Embodiment 3

[0031] Take 100g of peeled and non-mold neem kernels, soak them in 200ml of ethyl acetate to soften for 12 hours, then use a Joyoung household soymilk machine to stir and extract in ethyl acetate medium, stir and extract four times, combine the filtrates, and concentrate in vacuo to remove acetic acid Ethyl ester, add 4-8 times of kernel quality petroleum ether (boiling range is 60-90°C) to the concentrate, white flocs are produced, filter, wash the filter cake with petroleum ether, and dry to obtain azadirachtin 23 % white dry powder, the extraction rate of azadirachtin is 0.29%.

[0032] And use squeezed, degreased and pulverized seed kernels as raw materials to extract in the same way, that is, soak in ethyl acetate for 12 hours, then stir and extract four times, combine the filtrates, concentrate in vacuo to remove ethyl acetate, and add 4-8 times the seed kernels to the concentrate Quality petroleum ether (boiling range is 60-90°C), white flocs are produced, filter, wash ...

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Abstract

The invention discloses an extracting method of melicitrin, which comprises the following steps: first, immersing peeled melicit seed as 3-5 times organic solvent as melicitrin for 6-12 h; second, adopting high-speed blade to extract; filtering to obtain extract and filter cake; third, removing polarity organic solvent to obtain the product under 40 deg.c.

Description

technical field [0001] The invention relates to a method for extracting botanical pesticides, in particular to a method for extracting azadirachtin. Background technique [0002] Neem seeds contain a large amount of neem oil, so it is very difficult to crush the neem seeds directly, and it is often easy to cause sticky lumps to cause the pulverizer to fail to operate normally, and it is easy to cause the seeds to heat up, resulting in partial decomposition of azadirachtin; in literature reports There is also the use of first pressing to remove the oil and then crushing. Although this can solve the problem of crushing and agglomeration, part of the azadirachtin is dissolved in the pressed oil during the pressing process, and it is easy to cause temperature rise during the pressing process to partially decompose the azadirachtin. Contents of the invention [0003] The invention provides a crushing extraction process with simple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D407/04
Inventor 宋湛谦王秋芬赵淑英
Owner JIANGSU QIANGLIN BIO ENERGY
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