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Novel green alga polysaccharide bactericide and preparation method thereof

A green algae polysaccharide and fungicide technology, which is applied in the directions of fungicides, botanical equipment and methods, biocides, etc., can solve the problems that have not yet been seen, and achieve the advantages of improving plant stress resistance, promoting plant growth and simple operation steps. Effect

Active Publication Date: 2020-10-30
青岛海大生物集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no reports on the combination of chlorella polysaccharides and iodine modification

Method used

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  • Novel green alga polysaccharide bactericide and preparation method thereof
  • Novel green alga polysaccharide bactericide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Extraction of Chlorella Polysaccharide: Weigh 100g of Chlorella (Enteromorpha) dry powder, add 5g of hydrogen peroxide and mix well, leave it for 12 hours for oxidative degradation, then add 1000ml of water, extract in hot water at 80°C for 2 hours, Filter, concentrate, and dry to obtain chlorophyll polysaccharide.

[0027] (2) Iodine complexation reaction: add 20g of chlorella polysaccharide to 71g of aqueous solution and heat up to 80°C, add 5g of iodine and 2.5g of potassium iodide flux while stirring, add 1.5g of pH regulator lactic acid to adjust the pH to 7.3, avoid light React under stirring for 1.0 hour;

[0028] (3) Membrane filtration purification: filter the prepared solution through a membrane with a molecular weight cut-off of 800-2000Da to remove uncomplexed ions in the solution for purification;

[0029] (4) Concentrated spray drying: Concentrated spray drying, wherein the temperature at the air inlet is 180°C, and the temperature at the air outlet i...

Embodiment 2

[0031] (1) Extraction of Chlorella Polysaccharide: Weigh 80g of Chlorella (Enteromorpha) dry powder, add 8g of hydrogen peroxide and mix well, leave it for 20 hours for oxidative degradation, then add 1000ml of water, extract in hot water at 80°C for 2 hours, Filter, concentrate, and dry to obtain chlorophyll polysaccharide.

[0032] (2) Iodine complexation reaction: add 15g of chlorella polysaccharide to 77g of aqueous solution and heat up to 90°C, add 8g of iodine and 5g of potassium iodide flux while stirring, add 5g of pH citric acid regulator to adjust the pH to 6.5, avoid light and stir Down reaction 1.5 hours;

[0033] (3) Membrane filtration purification: filter the prepared solution through a membrane with a molecular weight cut-off of 800-1200Da to remove uncomplexed ions in the solution for purification;

[0034] (4) Concentrated spray drying: Concentrated spray drying, wherein the temperature at the air inlet is 200°C, and the temperature at the air outlet is 100°...

Embodiment 3

[0036] For the chlorella polysaccharide complexed iodine of embodiment 2, carried out the plate bacteriostasis experiment of four kinds of fungi of strawberry root rot, strawberry leukoplakia, ginger anthracnose, cucumber Fusarium wilt, the results show that the chlorella polysaccharide complexed iodine is diluted 900 Times showed good inhibitory effects on the above four strains. The antibacterial statistical results are shown in Table 1.

[0037] Table 1

[0038]

[0039] The chlorophyll polysaccharide complexed iodine in Example 1 and Example 2 was compared with Lunasen in the prevention and treatment of strawberry white spot. The medicines were diluted with water and sprayed, and the number of diseased plants was observed on the 3rd and 7th days after application. Calculate the control effect. The results are shown in Table 2.

[0040] Table 2

[0041]

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Abstract

The invention discloses a novel green alga polysaccharide bactericide and a preparation method thereof. The method specifically comprises the following steps of: (1) green alga polysaccharide extraction: extracting green alga polysaccharide by adopting an oxidative degradation method; (2) iodine complexation reaction: carrying out complexation reaction on the green alga polysaccharide, iodine andan iodine cosolvent under the action of acid to prepare a green alga polysaccharide complexation iodine solution; (3) membrane filtration and purification: performing membrane filtration on the prepared solution to remove uncomplexed ions in the solution for purification; and (4) concentrating and spray-drying: carrying out concentrating and spray-drying to obtain the green alga polysaccharide complex iodine. The green alga polysaccharide complex iodine provided by the invention is simple in process operation steps and is a novel green biological bactericide; and application test results showthat the sterilization effect is outstanding, and the development requirements of green agriculture in China are met.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of green biological fungicides, in particular to a novel green algae polysaccharide fungicide and a preparation method thereof. Background technique [0002] Since the 21st century, the public has paid more and more attention to food safety. Biological pesticides have become an important direction for the development of the pesticide industry due to their high safety, green and pollution-free, and harmless to humans and animals. They have broad prospects and huge development space. Countries around the world are vigorously promoting the use of biological pesticides. The Ministry of Agriculture and Rural Affairs of my country clearly pointed out in the "National Agricultural Sustainable Development Plan (2015-2030)" that by 2020, the country will promote high-efficiency, low-toxicity, low-residue pesticides and biological pesticides. This provides a strong policy orientation for green and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00A01N59/12A01N43/16A01P1/00A01P3/00A01P21/00
CPCC08B37/00C08B37/0003A01N59/12A01N43/16Y02A50/30
Inventor 王海华单俊伟
Owner 青岛海大生物集团股份有限公司
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