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Supersonic lixiviating nimbin

An azadirachtin and ultrasonic technology, applied in organic chemistry and other directions, can solve the problems of low value, single component, low extraction efficiency and so on

Inactive Publication Date: 2004-09-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The simple solvent method has a slow extraction speed and relatively low extraction efficiency; the supercritical carbon dioxide extraction method has better selectivity and is conducive to the extraction of components that require leaching at room temperature, but the extraction cost is high, and it is only suitable for extraction with high value, Substances with relatively single ingredients are not suitable for neem, which has low value and different solubility of active ingredients; foreign countries have reported microwave extraction of azadirachtin, and domestic technology is not yet mature, and its equipment investment is large, generally SMEs can't afford it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: the neem seed kernel after oil extraction should be broken to below 2mm, according to the ratio of weight ratio 1: 3.0~4.0 and solvent evenly mix, in ultrasonic frequency 15KHz, power density 25W / cm 2 Under the leaching for 30 minutes, the leaching temperature is 25° C., and the final leaching rate of the active ingredient of azadirachtin is 80%.

Embodiment 2

[0008] Embodiment 2: The neem seed kernel after oil extraction should be broken to below 2mm, according to the ratio of weight ratio 1: 4~4.5 and solvent evenly mix, at ultrasonic frequency 20KHz, power density 18W / cm 2 Under leaching for 30 minutes, the leaching temperature is 40° C., and the final leaching rate of the active ingredient of azadirachtin is 83%.

Embodiment 3

[0009] Embodiment 3: the neem seed kernel after oil extraction should be broken to below 2mm, according to the ratio of weight ratio 1: 4 and solvent evenly mix, at ultrasonic frequency 25KHz, power density 25W / cm 2 Under the leaching for 40 minutes, the leaching temperature is 50° C., and the final leaching rate of the active ingredient of azadirachtin is 85%.

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PUM

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Abstract

A method for preparing nimbin through supersonic wave extraction which comprises the steps of, disintegrating the nim seeds after oil extraction, charging it into extraction solvent, carrying out leaching process by supersonic wave. The method for preparing nimbin by the invention realizes low cost, and increased nimbin extraction efficiency.

Description

technical field [0001] The invention belongs to a combined extraction method of azadirachtin, in particular to a comprehensive extraction method of a solvent method and ultrasonic waves. technical background [0002] Azadirachtin is a substance extracted from the natural plant neem, which can be used to prevent and control crop pests and diseases. Its cost is low, but its effect is very good. It has no harm to human health, no residue, and pests will not develop resistance to it. Using it to prepare biopesticides has attracted more and more attention. There are some differences in the solubility of the insecticidal active ingredients of azadirachtin in solvents, and it is difficult to fully extract them with the existing conventional extraction methods. Conventional leaching methods include solvent method, supercritical carbon dioxide leaching method and microwave leaching method. The simple solvent method has a slow extraction speed and relatively low extraction efficienc...

Claims

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Application Information

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IPC IPC(8): C07D493/02
Inventor 陈玉明王勋业刘光华黄国有李中揆李兆瑞李月华方晓楠
Owner KUNMING UNIV OF SCI & TECH
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