CN113186111A - Deep sea actinomycete rhodococcus erythropolis and application thereof in inhibiting aflatoxin - Google Patents

Deep sea actinomycete rhodococcus erythropolis and application thereof in inhibiting aflatoxin Download PDF

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Publication number
CN113186111A
CN113186111A CN202011473063.0A CN202011473063A CN113186111A CN 113186111 A CN113186111 A CN 113186111A CN 202011473063 A CN202011473063 A CN 202011473063A CN 113186111 A CN113186111 A CN 113186111A
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aflatoxin
m2af
rhodococcus erythropolis
strain
deep sea
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Inventor
闫培生
邢雪
李玥昕
高秀君
王迪
蒋文俊
曹立新
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CHINA OCEAN MINERAL RESOURCES R&D ASSOCIATION
Harbin Institute of Technology Weihai
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CHINA OCEAN MINERAL RESOURCES R&D ASSOCIATION
Harbin Institute of Technology Weihai
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00Protecting plants
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G7/00Botany in general
    • A01G7/06Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23BPRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B9/00Preservation of edible seeds, e.g. cereals
    • A23B9/16Preserving with chemicals
    • A23B9/24Preserving with chemicals in the form of liquids or solids
    • A23B9/26Organic compounds; Microorganisms; Enzymes
    • A23B9/28Microorganisms; Enzymes; Antibiotics
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/42Preservation of non-alcoholic beverages
    • A23L2/44Preservation of non-alcoholic beverages by adding preservatives
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/34Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
    • A23L3/3454Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
    • A23L3/3463Organic compounds; Microorganisms; Enzymes
    • A23L3/3571Microorganisms; Enzymes
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20Bacteria; Culture media therefor

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Microbiology (AREA)
  • Wood Science & Technology (AREA)
  • Polymers & Plastics (AREA)
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  • Food Science & Technology (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • General Health & Medical Sciences (AREA)
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  • Genetics & Genomics (AREA)
  • Bioinformatics & Cheminformatics (AREA)
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  • Tropical Medicine & Parasitology (AREA)
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Abstract

The invention provides a deep sea actinomycete strain capable of inhibiting synthesis of aflatoxin, which is Rhodococcus erythropolis BC14-M2AF-1 strain (Rhodococcus erythropolis BC14-M2AF-1), is separated from sediments in 6105M depth in the Western Pacific ocean, is preserved in Guangdong province collection center of microbial strains, and has the preservation number of GDMCC No. 61239. Fermenting the BC14-M2AF-1 strain in a fresh water M2 culture medium to obtain a fermented cell-free supernatant, wherein the aflatoxin can be inhibited by 100% from the source of an aflatoxin synthesis way; the fermented cell-free supernatant can still inhibit the synthesis of aflatoxin by 100 percent after being treated at the high temperature and the high pressure of 121 ℃ and 103kPa for 30 minutes. The Rhodococcus erythropolis BC14-M2AF-1 strain and the fermentation product thereof can be used for effectively preventing and controlling aflatoxin pollution in field crop cultivation, grain storage, food and beverage processing, feed production and the like.

Description

Deep sea actinomycete rhodococcus erythropolis and application thereof in inhibiting aflatoxin
The technical field is as follows:
the invention relates to the technical field of deep sea biotechnology and biological prevention and control of aflatoxin, in particular to a deep sea actinomycete rhodococcus erythropolis and an effect of the deep sea actinomycete rhodococcus erythropolis in inhibiting aflatoxin.
Background art:
aflatoxin is a mycotoxin classified as a class I carcinogen by the international cancer agency, is mainly produced by aspergillus flavus, aspergillus parasiticus and other aspergillus fungi, can widely pollute grains planted in fields, and also can seriously harm the health of human beings and animals after the human beings and the animals eat foods and feeds polluted by the aflatoxin in the grain storage period and foods and feeds processed by the grains, so that the significant food and feed safety problem to be solved urgently in the world is effectively solved by effectively inhibiting the pollution of the aflatoxin in the grains, the feeds and the like, and the aflatoxin has important practical significance and remarkable economic and social benefits.
Nowadays, land resources are increasingly scarce, all countries in the world shift targets to the ocean, and particularly, the development and utilization of microbial resources in extreme environments such as deep ocean and the like become the focus of attention and competition in the world, and the research and application of the deep ocean microbial resources in the aspect of aflatoxin pollution prevention and control are not common in the world.
The invention content is as follows:
the technical problem to be solved by the invention is to overcome the defects of the prior art, and the adopted technical scheme is as follows: the deep sea actinomycete Rhodococcus erythropolis and the effect of the deep sea actinomycete Rhodococcus erythropolis in inhibiting aflatoxin are characterized by comprising the following steps:
(1) the deep sea actinomycete is Rhodococcus erythropolis BC14-M2AF-1 strain(s) ((R))RhodococcuserythropolisBC14-M2AF-1) and has been deposited at 26.10.2020 at the Guangdong province culture Collection with deposit number GDMCC No. 61239; the storage address is No. 59 building 5 of the Jie No. 100 of the Jie Zhonglu-Jie city, Guangdong province.
(2) The Rhodococcus erythropolis BC14-M2AF-1 strain is separated from sediments in 6105M water depth of the Western Pacific ocean and is obtained by separation through the following method: serially diluting the sediments stored at 4 ℃ by 10 times, coating the sediments on a fresh water M2 culture medium, culturing at a constant temperature of 28 ℃, picking out single colonies in time, and further streaking and purifying to obtain a pure strain BC14-M2 AF-1;
(3) the strain BC14-M2AF-1 is identified as Rhodococcus erythropolis (R) by 16S rRNA gene moleculesRhodococcus erythropolis) A new strain of (a);
(4) the Rhodococcus erythropolis BC14-M2AF-1 strain is inoculated in an M2 culture medium prepared by fresh water, and is subjected to shaking culture for 4-10 days at the temperature of 18-32 ℃, so that an active substance fermentation liquor containing the active substance for efficiently inhibiting the synthesis of the aflatoxin can be obtained, and the cell-free supernatant of the fermentation liquor can inhibit the synthesis of the aflatoxin by 100%.
(5) The active substance in the fermentation liquor of the Rhodococcus erythropolis BC14-M2AF-1 strain has high-temperature high-pressure stability, and the activity is not lost after the treatment for 30 minutes at the high temperature and the high pressure of 121 ℃ and 103 kPa;
(6) the Rhodococcus erythropolis BC14-M2AF-1 strain and the fermentation liquid thereof can be applied to effective prevention and control of aflatoxin pollution in field crop cultivation, grain storage, food and beverage processing, feed production and the like.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1: fermentation of Rhodococcus erythropolis strain BC14-M2AF-1
Inoculating liquid seeds of Rhodococcus erythropolis BC14-M2AF-1 strain into a liquid culture medium containing 0.5% of sodium acetate, 0.05% of peptone, 0.05% of yeast extract powder, 0.05% of beef extract, 0.05% of glucose, 0.05% of sucrose, 0.05% of soluble starch, 0.005% of trisodium citrate, 0.005% of malic acid, 0.005% of potassium sodium tartrate, 0.1% of ammonium nitrate, 0.02% of ammonium chloride and 100ml of fresh water according to the inoculation amount of 1-8%, culturing for 4-10 days at the temperature of 18-32 ℃ and at the speed of 100-.
Example 2: inhibition effect of cell-free supernatant fermented by Rhodococcus erythropolis BC14-M2AF-1 strain on synthesis of aflatoxin
The supernatant obtained in example 1 was added to the supernatant in a ratio of 2% glucose to 0.5% yeast extract to supplement nutrients, and used as a culture medium for culturing Aspergillus flavus toxin-producing microorganism Aspergillus parasiticus, the control culture medium was the liquid medium obtained in example 1, 2% glucose and 0.5% yeast extract were added to the culture medium, 1% of spore suspension of Aspergillus parasiticus was inoculated to the culture medium, the culture medium was cultured at 28 ℃ for 6 days, mycelia were collected by centrifugation, intermediate products of the aflatoxin biosynthetic pathway in the mycelia were extracted with a methanol-sodium hydroxide solution, and Optical Density (OD) was measured at 560nm560) The toxicity inhibiting rate (%) = (OD of control culture medium) was calculated560OD of cell-free fermentation supernatant560) OD of control culture solution560x 100, and the inhibition rate of cell-free supernatant fermented by the Rhodococcus erythropolis BC14-M2AF-1 strain on the synthesis of aflatoxin reaches 100 percent through determination and calculation.
Example 3: high-temperature high-pressure stability of active substances in fermentation liquor of Rhodococcus erythropolis strain BC14-M2AF-1
The cell-free fermentation supernatant obtained in example 1 was added at 121oC. Treating at 103kPa for 30 min, naturally cooling to room temperature, and comparing the treated fermentation broth, the fermentation broth without temperature treatment, and the controlInoculating 1% spore suspension of Aspergillus parasiticus into the culture solution, culturing at 28 deg.C for 6 days, centrifuging to collect mycelium, extracting intermediate product of aflatoxin biosynthesis pathway in the mycelium with methanol-sodium hydroxide solution, and measuring Optical Density (OD) at 560nm560) The toxicity inhibiting rate (%) = (OD of control culture medium) was calculated560OD of cell-free fermentation supernatant560) OD of control culture solution560x 100, determined and calculated even at 121oC. The fermentation liquor treated at the high temperature and the high pressure of 103kPa for 30 minutes can also have the same inhibition rate of aflatoxin synthesis as the fermentation liquor which is not treated at the temperature, and the inhibition rate of the aflatoxin synthesis reaches 100 percent, which shows that the toxicity inhibiting active substances in the fermentation liquor have high-temperature and high-pressure stability.

Claims (1)

1. A deep sea actinomycete strain separated from sediments in 6105M water depth of the Western Pacific ocean is Rhodococcus erythropolis BC14-M2AF-1 strain (Rhodococcus erythropolis BC14-M2AF-1), which is preserved in Guangdong province collection of microorganisms in 26 months 10 and 2020, and the preservation number is GDMCC number 61239.
CN202011473063.0A 2020-12-15 2020-12-15 Deep sea actinomycete rhodococcus erythropolis and application thereof in inhibiting aflatoxin Pending CN113186111A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099142A2 (en) * 2001-06-01 2002-12-12 Wilhelm Holzapfel Actinomycetes for breaking down aflatoxin b1, ochratoxin a and/or zearalenone
CN104745493A (en) * 2013-12-27 2015-07-01 中粮营养健康研究院有限公司 Separating, culturing and application methods for Rhodococcus erythropolis strain used for degrading aflatoxin B1
CN104738363A (en) * 2013-12-27 2015-07-01 中粮营养健康研究院有限公司 Uses of rhodococcus erythropolis in degradation of aflatoxin B1 in feed or raw materials of the feed
CN105039199A (en) * 2015-06-10 2015-11-11 哈尔滨工业大学(威海) Deep-sea Bacillus circulans and application thereof in suppression of aflatoxin

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099142A2 (en) * 2001-06-01 2002-12-12 Wilhelm Holzapfel Actinomycetes for breaking down aflatoxin b1, ochratoxin a and/or zearalenone
CN104745493A (en) * 2013-12-27 2015-07-01 中粮营养健康研究院有限公司 Separating, culturing and application methods for Rhodococcus erythropolis strain used for degrading aflatoxin B1
CN104738363A (en) * 2013-12-27 2015-07-01 中粮营养健康研究院有限公司 Uses of rhodococcus erythropolis in degradation of aflatoxin B1 in feed or raw materials of the feed
CN105039199A (en) * 2015-06-10 2015-11-11 哈尔滨工业大学(威海) Deep-sea Bacillus circulans and application thereof in suppression of aflatoxin

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