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Preparation method for natural insect repellent

A kind of insect repellant, a natural technology, applied in the fields of food science and technology and chemical engineering, can solve the problems of non-target object poisoning residue, increased dosage, serious problems, etc., achieve good avoidance rate and corrected mortality rate, low production cost, The effect of simple method

Inactive Publication Date: 2013-04-03
GANSU AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term use of phosphine leads to a rapid increase in the resistance of pests, causing a sharp increase in the amount of pesticides when pests are rampant again, causing toxic effects on non-target objects and more serious residual pollution

Method used

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  • Preparation method for natural insect repellent
  • Preparation method for natural insect repellent
  • Preparation method for natural insect repellent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Example 1 A kind of preparation method of natural insect repellent, after cumin seed is pulverized through 60 mesh sieves, obtain cumin powder; 10g cumin powder is placed in Soxhlet extractor, take 400mL sherwood oil as solvent, in 40 ℃ water bath Soxhlet extraction was carried out under the same conditions, and the active extract was obtained after 6 hours; the active extract was concentrated under reduced pressure at a temperature of 25 °C and a pressure of -0.08 MPa to remove the solvent to obtain 0.5 g of effective extract.

Embodiment 2

[0079] Example 2 A kind of preparation method of natural insect repellent, after cumin seed is pulverized through 80 mesh sieves, obtain cumin powder; 20g cumin powder is placed in Soxhlet extractor, take 600mL sherwood oil as solvent, in 45 ℃ water bath Soxhlet extraction was carried out under the same conditions, and the active extract was obtained after 8 hours; the active extract was concentrated under reduced pressure at a temperature of 30° C. and a pressure of -0.07 MPa to remove the solvent to obtain 1.5 g of effective extract.

Embodiment 3

[0080] Example 3 A kind of preparation method of natural insect repellant, after cumin seed is pulverized through 70 mesh sieves, obtain cumin powder; 15g cumin powder is placed in Soxhlet extractor, take 500mL sherwood oil as solvent, in 43 ℃ water bath Soxhlet extraction was carried out under the same conditions, and the active extract was obtained after 7 hours; the active extract was concentrated under reduced pressure to remove the solvent at a temperature of 27 ° C and a pressure of -0.076 MPa to obtain 1.1 g of effective extract.

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Abstract

The invention relates to a preparation method for a natural insect repellent. The method comprises the following steps: crushing cuminum grains and sieving by 60-80 mesh sieves to obtain cuminum powder; placing the cuminum powder into a Soxhlet extractor, and taking petroleum ether as a solvent to perform Soxhlet extraction under the water bath condition with the temperature of 40-45 DEG C to obtain the active extracting solution after 6-8 hours; and performing pressure reduction and concentration on the active extracting solution to remove the solvent, so as to obtain the effective extract. The preparation method provided by the invention is simple, the operation is simple, convenient and feasible, and the obtained extract has strong prevention and control effect on major stored grain insects.

Description

technical field [0001] The invention relates to the fields of food science technology and chemical engineering technology, in particular to a preparation method of a natural insect repellent. Background technique [0002] With the increase of population and the decrease of available arable land, the food problem is still one of the main problems faced by mankind in the 21st century; as an important strategic material, food is also of great significance to economic development and social stability. With the development of science and technology, the output of grain has been greatly improved, and its storage capacity is also increasing day by day. However, in the process of grain storage, grain is often harmed by insects, mildew, and rodents, and the losses caused are relatively large. Serious, among them, the harm of stored grain pests is one of the more serious problems in grain storage. The annual loss caused by insect pests in my country is about 3% to 5% of the total grain...

Claims

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Application Information

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IPC IPC(8): A23B9/26A23B9/22
Inventor 毕阳张忠王义李国林沈科萍董伯余
Owner GANSU AGRI UNIV
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