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Sodium alginate/milk fat powder insect virus microcapsule and preparation method thereof

An insect virus and sodium alginate technology, applied in the field of biological pesticides, can solve problems such as unstable control effect, and achieve the effects of prolonging storage time and improving insecticidal efficiency.

Pending Publication Date: 2021-01-12
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most biological pesticides, especially microbial pesticides, have unstable control effects in actual use, mainly because the biological activity of such pesticides is easily disturbed by factors such as external temperature and humidity. In order to improve the stability and biological activity of insect viruses , making it into microcapsules is an effective and feasible method

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0031] A preparation method of sodium alginate / cream powder insect virus microcapsules, comprising the following steps:

[0032] Step 1: adding the insect virus dry powder to the milk fat powder water mixture containing whey protein, stirring and mixing evenly to form mixture A;

[0033] Step 2: Add mixture A to the sodium alginate solution, stir and mix evenly to form mixture B;

[0034] Step 3: atomize and spray the mixture B into the calcium chloride solution, and stir to obtain the mixture C;

[0035] Step 4: filter the mixture C, take the filter residue, wash with deionized water, and collect the wet microcapsules;

[0036] Step 5: Pre-freeze the wet microcapsules at (-90) ~ (-60) °C, then take them out and place them at (-80) ~ (-40) °C for freeze-drying treatment to obtain sodium alginate / Cream powder insect virus microcapsules.

Embodiment 1

[0038] A preparation method of sodium alginate / cream powder insect virus microcapsules, comprising the following steps:

[0039] Step 1: Add 0.04g of insect virus dry powder to 30mL of milk fat powder water mixture containing whey protein, stir and mix evenly to form mixture A;

[0040] Step 2: Add mixture A to 63.5mL sodium alginate solution, stir and mix evenly to form mixture B;

[0041] Wherein, in mixture B, the mass fraction of milk fat powder containing whey protein is 4%, and the mass fraction of sodium alginate is 2.5%;

[0042] Step 3: Take mixture B and spray all of mixture B into the calcium chloride solution, and stir while spraying to obtain mixture C; specifically, use the peristaltic pump of the spray dryer to absorb at a speed of 2.5-5mL / min Mixture B, the feed liquid is atomized by a nozzle with an inner diameter of 0.5 mm, and 800-3000 mL of calcium chloride solution with a mass fraction of 2% is placed under the nozzle. The calcium chloride solution is equ...

Embodiment 2

[0046] A preparation method of sodium alginate / cream powder insect virus microcapsules, comprising the following steps:

[0047] Step 1: Add 0.04g of insect virus dry powder to 30mL of milk fat powder water mixture containing whey protein, stir and mix evenly to form mixture A;

[0048] Step 2: Add mixture A to 65mL sodium alginate solution, stir and mix evenly to form mixture B;

[0049] Wherein, in mixture B, the mass fraction of milk fat powder containing whey protein is 4%, and the mass fraction of sodium alginate is 1%;

[0050] Step 3: Take mixture B and spray all of mixture B into the calcium chloride solution, and stir while spraying to obtain mixture C; specifically, use the peristaltic pump of the spray dryer to absorb at a speed of 2.5-5mL / min For mixture B, the feed liquid is atomized by a nozzle with an inner diameter of 0.5 mm. 800-3000 mL of calcium chloride solution with a mass fraction of 2% is placed under the nozzle. The calcium chloride solution is equipped ...

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Abstract

The invention relates to the technical field of biopesticides, in particular to a sodium alginate / milk fat powder insect virus microcapsule and a preparation method thereof. The preparation method ofthe microcapsule comprises the following steps: 1, adding insect virus dry powder into whey protein-containing milk fat powder-water mixed liquid, and uniformly stirring to form a mixture A; 2, addingthe mixture A into a sodium alginate solution, and uniformly stirring to form a mixture B; 3, atomizing the mixture B, spraying the atomized mixture B into a calcium chloride solution, and stirring to obtain a mixture C; 4, filtering the mixture C, taking filter residues, washing the filter residues with deionized water, and collecting wet microcapsules; and 5, pre-freezing the wet microcapsulesat (-90)-(-60) DEG C, then taking out the pre-frozen wet microcapsules, and carrying out freeze drying treatment at (-80)-(-40) DEG C. The microcapsule provided by the invention can be applied to control of prodenia litura, beet armyworm and other insects, can effectively protect insect viruses from being killed by light, and improves the insecticidal efficiency.

Description

technical field [0001] The invention relates to the technical field of biological pesticides, in particular to a sodium alginate / milk fat powder insect virus microcapsule and a preparation method thereof. Background technique [0002] China is a big country in the production and consumption of pesticides, and people no longer only pay attention to the high toxicity and high efficiency of pesticides. Instead, the safety of pesticides for humans and their compatibility with the environment has been increasingly emphasized. For example, the large-scale use of pesticides has led to insect populations becoming resistant, which in turn requires the use of more pesticides, resulting in the reappearance of pesticides and pesticide residues in agricultural products, causing environmental pollution and ecological balance problems. [0003] As an environment-friendly pesticide, biological pesticides have the advantages that insects are not easy to develop resistance, are harmless to h...

Claims

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Application Information

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IPC IPC(8): B01J13/04A01N25/28A01N63/40A01N25/32
CPCB01J13/043A01N25/28A01N63/40A01N25/32
Inventor 罗萌蒲侠周新华舒绪刚
Owner ZHONGKAI UNIV OF AGRI & ENG
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