Method for preparing controlled photodegradable nano avermectins microcapsules

A technology of abamectin and photodegradation, applied in the directions of botanical equipment and methods, chemicals for biological control, animal repellents, etc., to achieve good application prospects, mild reaction conditions, and good reproducibility.

Inactive Publication Date: 2010-10-27
迟德富 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the damage brought by chemical pesticides to human beings has also gradually emerged. Due to the extensive use of chemical pesticides, the air, water, soil and food have been polluted, and poisoning has occurred frequently due to the accumulation of poisons in domestic animals and human bodies. Two million people were poisoned by the use of chemical pesticides, and about 40,000 of them died. Moreover, long-term use of certain chemical pesticides will also cause pests to develop resistance. There are currently 417 species of resistant pests. Beginning of a complete ban on the use of organochlorine pesticides, despite this, past accumulations of pesticides are still effective for a considerable period of time
Is there a new type of pesticide that only deals with pests and diseases and has no side effects on humans? In recent years, in agricultural production, it has gradually become a trend to use biological pesticides instead of chemical pesticides. Countries around the world have developed A series of biological pesticides with strong selectivity, high efficiency, low cost, no pollution, and harmless to humans and animals

Method used

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  • Method for preparing controlled photodegradable nano avermectins microcapsules
  • Method for preparing controlled photodegradable nano avermectins microcapsules
  • Method for preparing controlled photodegradable nano avermectins microcapsules

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Crystal recrystallization of Abamectin original drug: Dissolve 0.1g Abamectin original drug in 50mL acetone, magnetically stir for 1h, and immediately add 200mL containing 0.025% m / v hydroxypropylmethyl Cellulose (HPMC) deionized water, magnetic stirring, use probe-type ultrasonic to adjust the crystal particle size of imidacloprid pesticide, the ultrasonic time is 3 minutes, the particle size is 0.1 micron, and the recrystallized crystal of Abamectin original drug is obtained,

[0035] (2) Preparation of nano-abamectin by layer-by-layer self-assembly method: disperse 10 mg of recrystallized crystals of the original drug of avermectin in 500 μL deionized water, add 1 mL of chitosan with a concentration of 1.6 mg / mL, and ultrasonically adsorb 5min, after two cycles of centrifugation-removal of supernatant-washing-oscillation, 1mL of sodium alginate with a concentration of 1.5mg / mL was added, adsorbed for 5min, the above steps were repeated, and chitosan and sodium alg...

Embodiment 2

[0038] (1) Crystal recrystallization of Abamectin original drug: Dissolve 0.5g Abamectin original drug in 50ml ethanol, magnetically stir for 1h, and immediately add 200mL containing 0.025% m / v hydroxypropyl methyl Cellulose (HPMC) deionized water, magnetic stirring, use probe-type ultrasonic to adjust the crystal particle size of imidacloprid pesticide, the ultrasonic time is 5 minutes, the particle size is 0.5 micron, and the recrystallized crystal of the original drug of abamectin is obtained,

[0039] (2) Prepare nano-abamectin by layer-by-layer self-assembly method: disperse 20 mg of recrystallized crystals of the original drug of avermectin in 500 μL of deionized water, add 1 mL of polyarginine with a concentration of 1.8 mg / mL, and ultrasonically Adsorb for 10 minutes, after two cycles of centrifugation-removal of supernatant-washing-oscillation, add 1 mL of dextran sulfate with a concentration of 1 mg / mL, absorb for 10 minutes, repeat the above steps, and absorb chitosa...

Embodiment 3

[0042] (1) Crystal recrystallization of Abamectin original drug: Dissolve 1g of Abamectin original drug in 50ml of methanol, stir magnetically for 1 hour, and add 200mL containing 0.025% m / v hydroxypropyl methylcellulose immediately after the dissolution is complete. Prime (HPMC) deionized water, magnetic stirring, use probe type ultrasonic wave to adjust imidacloprid pesticide crystal particle size, ultrasonic time is 10 minutes, and particle size is 100 micron, obtains the recrystallized crystal of Abamectin former drug,

[0043] (2) Prepare nano-abamectin by layer-by-layer self-assembly method: disperse 100 mg of recrystallized crystals of the original drug of avermectin in 500 μL deionized water, add 1 mL of cationic dextran with a concentration of 4.5 mg / mL, and ultrasonically Adsorbed for 15 minutes, after two cycles of centrifugation-removal of supernatant-washing-oscillation, add 1 mL of sodium carboxymethylcellulose with a concentration of 3 mg / mL, and absorb for 15 mi...

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Abstract

The invention relates to a method for preparing controlled photodegradable nano avermectins microcapsules, which is characterized by (1) re-separating out the raw pesticide in the form of crystals and adjusting the particle size by a probe-type ultrasonic method or a vibration method, (2) using avermectins as the template particles, using two biocompatible macromolecules with opposite charges as the wall materials and forming an extremely thin protective outer film on the surface of imidacloprid, thus obtaining the avermectins microcapsules, and (3) using W and Ag+ to adjust the photodegradable activity of TiO2. An appropriate nano photocatalyst is selected according to the actual demand to prepare the photodegradable nano imidacloprid. The method is simple in process, mild in reaction conditions, easy in operation and good in repeatability, provides material base and technical support for developing the efficient green pesticides and has good application prospect.

Description

technical field [0001] The invention belongs to the field of novel pesticide preparations, and in particular relates to a method for preparing controllable photodegradable nano-abamectin microcapsules. Background technique [0002] At present, chemical pesticides are effective drugs developed by humans to eliminate pests and diseases. Since the use of chemical pesticides, human beings have felt the benefits of chemical pesticides to human beings, such as increasing crop production, preventing and controlling human infectious diseases. According to the survey data of the Food and Agriculture Organization of the United Nations, the grains that are taken away by diseases and insect pests account for 20% of the global harvest every year. %-30%, thus, the economic loss caused reaches 120 billion U.S. dollars. In order to deal with pests and diseases, more than 2 million tons of various chemical pesticides will be produced every year, and its sales volume is as high as 10 billion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/90A01N51/00A01N25/28A01N25/08A01P7/00
Inventor 迟德富关桦楠宇佳张思宇
Owner 迟德富
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