阅读说明：本技术 精氨酸作为脱氧雪腐镰刀菌烯醇生成抑制剂的用途 (Application of arginine as deoxynivalenol production inhibitor ) 是由 韩铮 范楷 郭文博 聂冬霞 于 2021-01-19 设计创作，主要内容包括：本发明公开了精氨酸作为脱氧雪腐镰刀菌烯醇生成抑制剂的用途,其中精氨酸使用时配制成浓度为10mM及以上浓度的水溶液。本发明采用精氨酸作为脱氧雪腐镰刀菌烯醇生成抑制剂,健康、无毒,在较低的含量下即可有效抑制镰刀菌等真菌在食用农产品中产生脱氧雪腐镰刀菌烯醇。(The invention discloses application of arginine as a deoxynivalenol production inhibitor, wherein arginine is prepared into an aqueous solution with the concentration of 10mM or more when in use. The invention adopts arginine as the deoxynivalenol generation inhibitor, is healthy and nontoxic, and can effectively inhibit fungi such as fusarium and the like from generating the deoxynivalenol in edible agricultural products at lower content.)

1. Use of arginine as an inhibitor of deoxynivalenol production.

2. Use of arginine as an inhibitor of the production of deoxynivalenol according to claim 1, wherein arginine is formulated in use as an aqueous solution having a concentration of 10mM or more.

3. Use of arginine as an inhibitor of the production of deoxynivalenol according to claim 2 wherein the concentration of the aqueous arginine solution is 10 to 500 mM.

4. The application of arginine as a fungal inhibitor, wherein the fungus is fusarium graminearum, fusarium oxysporum, fusarium flavum or fusarium moniliforme.

5. The use of arginine as a fungal inhibitor according to claim 4 wherein arginine, when used, is formulated in an aqueous solution having a concentration of 50 to 500 mM.

Technical Field

The invention relates to the technical field of biology, in particular to application of arginine as a deoxynivalenol production inhibitor.

Background

Deoxynivalenol (DON), also known as vomitoxin, is an important mycotoxin produced by fusarium graminearum and fusarium flavum, has acute toxicity (diarrhea, vomiting, leukocytosis, etc.) and chronic toxicity (anorexia, weight loss, feed titer reduction, etc.), and has been identified as one of the most dangerous food contaminants. JAFAC in 2010 suggests that the maximum intake of DON on a given day should not exceed 1. mu.g/kg bw/day. China is one of the countries with the most serious harm to the DON in the world, and in 2008 of 2007-. According to the results of investigation on 180 parts of wheat in 21 counties of Jiangsu province in 2010-2012 continuously for 3 years, the detection rate of the DON is as high as 74.4%, and the concentration is 14.5-41157.1 mu g/kg. In 2010, 63 parts of Zhejiang province and 6 parts of Jilin province corn samples were investigated, and it was found that 61 parts of the corn samples contained DON, and the detection rate was 88.4%, and the concentration was 2.7-311.2. mu.g/kg. Therefore, DON pollution seriously threatens the food safety of China.

Therefore, the active substances capable of inhibiting DON generation are found, and the method has very important significance for guaranteeing the quality safety of agricultural products and promoting the national economic development.

Disclosure of Invention

The invention provides application of arginine as a deoxynivalenol production inhibitor;

specifically, arginine can be used to prepare an aqueous solution with the concentration of 10mM or more, and the preferred concentration of the aqueous solution of arginine is 10-500 mM;

further preferably, when the arginine aqueous solution is used for agricultural products such as wheat, corn, peanut, oat, rye and the like as the deoxynivalenol production inhibitor, the concentration of the arginine aqueous solution is preferably 100-500 mM;

the deoxynivalenol is mainly produced by fusarium graminearum, fusarium oxysporum, fusarium flavum, fusarium moniliforme and other fungi;

when arginine is used as the deoxynivalenol production inhibitor, the arginine aqueous solution can be directly sprayed on the surface of agricultural products or directly added into a substrate and the like.

The invention also provides application of arginine as a fungal inhibitor, wherein the fungus is fusarium graminearum, fusarium oxysporum, fusarium flavum or fusarium moniliforme;

arginine, when used as a fungal inhibitor, may be formulated in an aqueous solution at a concentration of 50-500 mM.

The application of the arginine as the deoxynivalenol production inhibitor provided by the invention has the following advantages:

(1) the invention discovers for the first time that arginine can effectively inhibit the generation of deoxynivalenol in different matrixes;

(2) the arginine of the invention belongs to a commercialized product with wide source and low price, and the formed inhibitor has low cost and can be applied in large scale.

(3) The arginine of the invention belongs to essential amino acid for human body, has good safety for human and livestock, and has no pollution to environment;

(4) the inhibitor is simple to use, can be used by ordinary personnel after simple training, and is beneficial to large-scale popularization;

(5) the inhibitor has good effect of inhibiting the generation of the deoxynivalenol, can even inhibit the growth of fungal strains at high concentration, and provides an effective means for preventing and controlling the mycotoxin in agricultural products.

(6) The activity of arginine for inhibiting biosynthesis of deoxynivalenol is provided for the first time, and compared with other existing inhibitors, the arginine inhibitor has the advantages of more obvious arginine inhibition effect, lower cost, no harm to organisms and difficulty in generating drug resistance.

Drawings

FIG. 1 inhibition of DON production in PDA Medium by arginine at various concentrations

FIG. 2 inhibition of growth of DON toxigenic fungal strains in PDA medium by arginine at different concentrations

FIG. 3 inhibition of the production of DON in wheat by arginine at different concentrations

FIG. 4 inhibition of DON production in maize by arginine at various concentrations

Detailed Description

The raw material sources are as follows:

arginine: from chemical reagents of national drug group, Inc., Shanghai, China

Fusarium graminearum strain F4582: DSMZ purchased from German Collection of microorganisms and cell cultures

Raw materials used in PDA culture medium and PDB liquid culture medium, and wheat and corn: common commercial products. The experimental methods used in the following examples:

1. method for culturing fusarium graminearum strain F4582 strain

PDA culture medium: boiling 200g of peeled potato for 30min, taking the filtrate, adding 20g of glucose and 16g of agar, diluting to 1000mL with distilled water, autoclaving at 115 ℃ for 30min, cooling to about 55 ℃, and pouring into a flat plate, wherein each flat plate is 20 mL.

PDB liquid medium: boiling 200g of peeled potato for 30min, filtering, adding 20g of glucose, diluting to 1000mL with distilled water, and autoclaving at 115 deg.C for 30 min.

Activating and culturing strains: fusarium graminearum strain F4582 (purchased from German culture Collection of microorganisms and cell cultures DSMZ) is inoculated in a PDA culture medium, after dark culture at 28 ℃ for 7 days, the fusarium graminearum strain is inoculated in a PDB liquid culture medium, and the culture is continued for 5 days with shaking at 150r/min at 25 ℃. Taking fusarium graminearum F4582 spore liquid, observing the spore concentration by a microscope, and adjusting the spore concentration to 10 by using sterile water⁵one/mL, used for inoculation in subsequent examples 1-3.

2. DON extraction method

Respectively drying PDA culture medium, wheat and corn in 50 deg.C oven, pulverizing, mixing, accurately weighing 2g pulverized sample in 50mL centrifuge tube, adding 10mL acetonitrile/water (84/16, v/v), vortex shaking for 1min, soaking for 5min, and ultrasonic extracting for 1 hr. Centrifuging at 4000r/min for 10min, collecting 5mL supernatant, blow-drying at 40 deg.C with nitrogen, dissolving the residue with 1mL of 5mmol/L ammonium acetate aqueous solution/methanol (80:20, v: v), vortexing for 30s, ultrasonic treating for 1min, vortexing for 30s, dissolving completely, diluting, filtering with 0.22 μm filter membrane, and measuring by UPLC-MS/MS.

3. UPLC-MS/MS detection condition and method of DON

A chromatographic column: agilent Poroshell 120EC-C₁₈Chromatography column (100 mm. times.3.0 mm, 2.7 mm); mobile phase: the mobile phase A is 5mmol/L ammonium acetate solution, and the mobile phase B is methanol; gradient elution procedure: 0-0.5 mim, 10% A; 4min, 90% A; 4.5min, 90% A; 4.7min, 10% A; 6min, 10% A; the flow rate is 0.4 mL/min; 3 mu L of sample volume; the column temperature was 40 ℃.

Simultaneously scanning in an electrospray ionization source (ESI) positive and negative ion mode; the atomization gas and the auxiliary gas are high-purity air, and the collision gas is high-purity nitrogen; atomizing: 50 Psi; auxiliary gas: 50 Psi; atomization temperature: 500.0 ℃; spraying voltage: 5500V; spraying voltage air curtain gas: 35 Psi; collision gas: 8 Psi: the target compound was accurately quantified by Multiple Reaction Monitoring (MRM) mode. DON parent ion (m/z) was 297.3, quantitive daughter ion (m/z) was 203.0, collision voltage was 28eV, qualitative daughter ion (m/z) was 175.1, and collision voltage was 28 eV.

EXAMPLE 1 inhibition of DON Synthesis by arginine in PDA Medium

An appropriate amount of arginine was weighed and dissolved in 10mL of sterile ultrapure water, and 90mL of sterilized PDA medium was added after filtration sterilization so that the final addition concentrations reached 0, 0.1, 1, 10, 50, 100mM and 500mM, respectively. After mixing and plate pouring, inoculating 100 mu L fusarium graminearum F4582 spore liquid, culturing for 9 days in a constant temperature and humidity incubator at 28 ℃ in the dark, and detecting the yield of DON. Each concentration setting was paralleled by 5 parts.

The results are shown in FIG. 1, and compared with the control group (arginine concentration 0mM), all the arginine concentrations can inhibit DON biosynthesis (P <0.05), and the inhibition effect is enhanced along with the increase of the arginine concentration. The yield of DON is reduced by 24.5%, 52.2% and 68.6% when the arginine concentration is 0.1, 1 and 10mM respectively, and the production of DON is almost completely inhibited when the arginine concentration reaches 50, 100 and 500 mM.

Compared with the control group (arginine concentration of 0mM), at low concentration, the effect of arginine on the growth of fusarium graminearum F4582 is not obvious, but at the concentration of 50mM, the arginine can obviously inhibit the growth of fusarium graminearum F4582, and at the concentration of 500mM, the arginine can almost completely inhibit the growth of fusarium graminearum F4582 (figure 2).

Example 2 inhibition of the synthesis of DON by arginine in wheat

Appropriate amount of arginine was weighed and dissolved in sterile ultrapure water to prepare arginine solutions with concentrations of 1mM, 10mM, 100mM and 500mM, respectively, and filtered to sterilize. 50g of wheat is accurately weighed in a 250mL sterile conical flask, 50mL of arginine solution with different concentrations are respectively added after 30 minutes of autoclaving at 120 ℃, and 50mL of sterile ultrapure water is added into a control group. Sealing the conical flask with a sterile air-permeable sealing film, shaking uniformly, adding 100 μ L of Fusarium graminearum F4582 spore liquid, culturing in a constant-temperature constant-humidity incubator at 28 ℃ for 28 days in the dark, and detecting the yield of DON. Each concentration setting was paralleled by 5 parts.

The results show that low concentrations of arginine had no significant effect on DON production in wheat compared to the control group, while high concentrations of arginine significantly inhibited DON synthesis (P <0.01) (fig. 3). Under the action of 100mM arginine, the yield of DON is reduced by 66.6%, and 500mM arginine almost completely inhibits the production of DON in wheat.

Example 3 inhibition of DON Synthesis by arginine in maize

Appropriate amount of arginine was weighed and dissolved in sterile ultrapure water to prepare arginine solutions with concentrations of 1mM, 10mM, 100mM and 500mM, respectively, and filtered to sterilize. 50g of corn is accurately weighed in a 250mL sterile conical flask, 50mL of arginine solution with different concentrations are respectively added after 30 minutes of autoclaving at 120 ℃, and 50mL of sterile ultrapure water is added into a control group. Sealing the conical flask with a sterile air-permeable sealing film, shaking uniformly, adding 100 μ L of Fusarium graminearum F4582 spore liquid, culturing in a constant-temperature constant-humidity incubator at 28 ℃ for 28 days in the dark, and detecting the yield of DON. Each concentration setting was paralleled by 5 parts.

The results show that low concentrations of arginine had no significant effect on DON production in maize compared to the control group, while high concentrations of arginine significantly inhibited DON synthesis (P <0.01) (figure 4). Under the action of 100mM arginine, the yield of the DON is reduced by 48.1%, and 500mM arginine almost completely inhibits the production of the DON in the corn.