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Method for preparing novel and low toxicity fungicide for crops

A technology for crops and fungicides, applied in the field of preparation of chitooligosaccharide metal complex fungicides, can solve the problems of uneven degradation, long reaction time, etc., and achieve the effects of expanding application range, enhancing bactericidal activity, and low drug efficacy

Inactive Publication Date: 2009-04-29
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional water bath heating method has a long reaction time and uneven degradation

Method used

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  • Method for preparing novel and low toxicity fungicide for crops
  • Method for preparing novel and low toxicity fungicide for crops
  • Method for preparing novel and low toxicity fungicide for crops

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 10g chitosan (Mw=7.6×10 5 , degree of deacetylation is 84.1%), be dissolved in 150mL1% hydrochloric acid solution, after stirring to form a homogeneous colloid, add H with chitosan equimolar amount 2 o 2 , cover the lid, place the reactor in a microwave oven, and react under 850W microwave power for 3 minutes (intermittent operation, every 1-2 minutes, start the microwave for 1 minute), to obtain a light yellow transparent solution, take it out and quickly cool it to room temperature, and then under magnetic stirring (Magnetic stirring adopts 78-1 type magnetic stirrer) in the reaction solution, directly add CuSO in an equimolar amount with chitosan 4 Aqueous solution, stirred for 4 hours at pH 6, added 3-4 times the amount of acetone to form a precipitate, filtered, washed with 70-80% ethanol several times, no white precipitate was detected by barium chloride solution; finally washed with absolute ethanol Twice, dry to constant weight, and pulverize with a pulverizer...

Embodiment 2

[0038] 10g chitosan (Mw=7.6×10 5 , degree of deacetylation is 84.1%), be dissolved in 150mL1% hydrochloric acid solution, after stirring to form a homogeneous colloid, add H with chitosan equimolar amount 2 o 2 , cover the lid, place the reactor in a microwave oven, and react under 850W microwave power for 3 minutes (intermittent operation, every 1-2 minutes, start the microwave for 1 minute), to obtain a light yellow transparent solution, take it out and quickly cool it to room temperature, and then under magnetic stirring (Magnetic stirring adopts 78-1 type magnetic stirrer) in the reaction solution, directly drop ZnSO with chitosan equimolar amount 4 Aqueous solution, stirred for 4 hours at pH 6, added 3-4 times the amount of acetone to form a precipitate, filtered, washed with 70-80% ethanol several times, no white precipitate was detected by barium chloride solution; finally washed with absolute ethanol Twice, dry to constant weight, and pulverize with a pulverizer to o...

Embodiment 3

[0042] 10g chitosan (Mw=7.6×10 5 , deacetylation degree is 84.1%), be dissolved in 200mL1% hydrochloric acid solution, after stirring to form uniform colloid, add the H that is 0.5 with chitosan molar ratio 2 o 2, cover the lid, place the reactor in a microwave oven, and react under 340W microwave power for 10 minutes (intermittent operation, every 1-2 minutes, start the microwave for 1 minute), to obtain a yellow-brown transparent solution, take it out and quickly cool it to room temperature, and then under magnetic stirring (Magnetic stirring adopts 78-1 type magnetic stirrer) in the reaction solution, directly add CuSO in an equimolar amount with chitosan 4 Aqueous solution, stirred at pH 4 for 12 hours, added 3-4 times the amount of acetone / ethanol mixture (1:1) to form a precipitate, filtered, washed several times with 70-80% ethanol, no white was detected by barium chloride solution Precipitation is formed; finally, it is washed twice with absolute ethanol, dried to co...

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PUM

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Abstract

A low-toxin bactericide for preventing and eliminating the diseases and pests of agricultural crops is prepared from high-molecular chitosan through degradating in homogenizing solvent by microwave irradiation, adding metallic compound, coordinate reaction, depositing, filter, baking and baking.

Description

technical field [0001] The invention relates to a metal organic compound fungicide, in particular to a preparation method of a chitooligosaccharide metal complex fungicide with low toxicity and control effect on crop diseases. The fungicide has a significant inhibitory effect on crop pathogenic bacteria and has an SOD-like activity, and can improve the stress resistance of crops. Background technique [0002] Copper-based fungicides are the earliest developed among agricultural fungicides, have the longest use time, the largest application area, and the best bactericidal effect. Copper-based fungicides generally can kill bacteria and fungi, and have protective and preventive effects. Certain healing and eradicating effects. Copper ions are also trace elements necessary for plant growth and metabolism. Although excessive copper ions will cause plant phytotoxicity, an appropriate amount of copper ions can make plants grow stronger. Using copper preparations as fungicides not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N55/02A01P3/00
Inventor 李鹏程刘松邢荣娥于华华郭占勇王丕波李翠萍
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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