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A high temperature resistant Aspergillus fumigatus strain 23# and its application

A technology of Aspergillus fumigatus and high temperature resistance, applied in the field of microorganisms, can solve problems such as environmental pollution, high cost, and cumbersome degradation conditions, and achieve the effects of reducing product cost, accelerating decomposition, and increasing germination rate

Active Publication Date: 2020-04-17
TIANJIN AGRICULTURE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the previous methods have the disadvantages of high cost, cumbersome degradation conditions and easy to cause environmental pollution, while the biodegradation method mainly uses cellulase to catalyze the degradation of cellulose, which has become the main method due to its high specificity and low cost. a means of attention

Method used

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  • A high temperature resistant Aspergillus fumigatus strain 23# and its application
  • A high temperature resistant Aspergillus fumigatus strain 23# and its application
  • A high temperature resistant Aspergillus fumigatus strain 23# and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of Aspergillus fumigatus bacterial strain 23#, its screening process is as follows:

[0040] 1) Soil collection: In this experiment, the rhizosphere soil of cucumbers affected by the disease in Cangzhou, Hebei Province was collected, and the collected soil samples were stored at 4°C for future use in screening soil fungi.

[0041] 2) Separation and purification of soil fungi: ① Take 5g of soil and add it to 1% physiological saline to form a ratio of 1:102 , 1:10 3 , 1:10 4 , 1:10 5 and 1:10 6 After fully shaking the soil dilution solution, draw 100 μL of the above-mentioned soil dilution solutions of different dilutions and spread them on the PDA solid medium containing ampicillin, and then place the PDA solid medium at 28°C for 2 to 3 days. . ② After culturing, select typical fungal colonies and continue pure culture on PDA solid medium.

[0042] 3) Strain identification: ① Extract fungal DNA by CTAB method. Genomic DNA of the strain TJ was extracted using...

Embodiment 2

[0050] The cultivation method of aspergillus fumigatus Aspergillus fumigatus 23#, its step is as follows:

[0051] Aspergillus fumigatus 23# spore powder was inoculated on the enzyme-producing medium at 1% (weight ratio), cultured at 37° C., and the culture ended after 48 hours. Use a hemocytometer to measure the number of spores, and the number of spores is greater than 20×10 8 CFU / g. The number of spores of the strain increased rapidly after 12 hours of culture, and the number of spores was as high as 3×10 8 CFU / g, slowly increasing within 16h-40h, tending to be flat at 40-48h, until reaching the maximum at 48h, the number of spores is greater than 20×10 8 CFU / g, the concentration of spore number decreased after 48h. Compared with the general Aspergillus fumigatus strain, the sporulation speed was significantly accelerated (1×10 8 CFU / g). (Spore count curve see figure 2 ).

Embodiment 3

[0053] Aspergillus fumigatus 23# and other Aspergillus fumigatus strains 30# isolated from our laboratory were inoculated on the differential enzyme-producing cellulose-decomposing medium, and cultured for 3 days. Be careful not to contaminate it and save it for later use. After the colony grows well, open the cover and spread it out on the table, use a pipette gun to draw 5mL0.1% Congo red solution onto each plate, slowly rotate until the Congo red solution evenly covers the surface of the plate, and let it stand for 30 minutes for staining. Pour off the excess liquid; then use a pipette gun to draw 3mL1mol / L NaCl eluent onto each plate, rotate slowly until the surface of the plate is evenly covered, let stand for decolorization for 1h, and elute for 20min, then add 3ml of 5% sodium acetate solution to fix After 10 min of treatment, excess liquid was poured off. Observe the comparison of the size of the transparent circle and the strain (see the results of the transparent ci...

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Abstract

The invention discloses a high temperature-resistant Aspergillus fumigatus strain Aspergillus fumigatus 23#, and the preservation number is CGMCC No.17190. The growth temperature of the strain is 28-50°C. A method for preparing cellulose crude enzyme liquid, characterized in that it comprises the following steps: Step 1, inserting Aspergillus fumigatus 23# into a slant medium for multiplication culture to obtain seeds; the temperature for the multiplication culture is 28-37°C , the cultivation time is 48~96h; and the rotating speed of shaker cultivation is 180~200r / min; step 2, insert the described seed obtained in step 2 into the enzyme-producing medium for fermentation and cultivation, and separate the fermented liquid to obtain crude cellulose Enzyme liquid; the temperature of the fermentation culture is 28-37° C., and the culture time is 48-96 hours. The Aspergillus fumigatus 23# of the present invention has strong growth ability, strong sporulation ability, and high temperature resistance of 50°C.

Description

technical field [0001] The invention belongs to the technical field of microbes, and in particular relates to a high-temperature-resistant Aspergillus fumigatus strain 23# and its application. Background technique [0002] As a large agricultural country, my country has a huge amount of crop straw every year, mainly cellulose (polysaccharide macromolecules) and hemicellulose, and a small amount of missing seeds contain protein. However, the structure of cellulose is complex and difficult to be degraded. The general degradation methods mainly include mechanical degradation, hydrolysis, thermal degradation, oxidative degradation, photochemical degradation and enzymatic (biological) degradation. However, the previous methods have the disadvantages of high cost, cumbersome degradation conditions and easy to cause environmental pollution, while the biodegradation method mainly uses cellulase to catalyze the degradation of cellulose, which has become the main method due to its hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/14C12N9/42C05F17/20C12R1/68
CPCC12N1/14C12N9/2437C12R2001/68C12N1/145C05F17/20Y02W30/40
Inventor 王远宏艾丹常若葵张斌
Owner TIANJIN AGRICULTURE COLLEGE
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