阅读说明：本技术 含二硫键的抑菌剂的制备方法与应用 (Preparation method and application of bacteriostatic agent containing disulfide bond ) 是由 蒋建中 吕淼 于 2020-12-22 设计创作，主要内容包括：本发明公开了一种含二硫键的广谱抑菌剂的制备方法,所述抑菌剂的结构式为：其中,n为1-3的整数,m为8-13的整数,X＝Cl、Br、I。本发明的含二硫键的抑菌剂,对大肠杆菌、金黄色葡萄球菌、白色念珠菌等生活常见菌都表现出了良好的抑菌效果,是一种新型的广谱抑菌剂；同时该含二硫键的抑菌剂具有良好的生物相容性和生物降解性,安全性更好。(The invention discloses a preparation method of a disulfide bond-containing broad-spectrum bacteriostatic agent, wherein the structural formula of the bacteriostatic agent is as follows: wherein n is an integer of 1 to 3, m is an integer of 8 to 13, and X is Cl, Br, I. The bacteriostatic agent containing the disulfide bond shows good bacteriostatic effect on common living bacteria such as escherichia coli, staphylococcus aureus, candida albicans and the like, and is a novel broad-spectrum bacteriostatic agent; meanwhile, the bacteriostatic agent containing the disulfide bond has good biocompatibility and biodegradability and better safety.)

1. A method for preparing a disulfide bond-containing bacteriostatic agent, wherein the bacteriostatic agent has a structural formula shown as a formula (I):

wherein n is an integer of 1-3, m is an integer of 7-17, and X is Cl, Br, I;

the preparation method is characterized by comprising the following steps:

(1) under an alkaline condition, mixing cystamine dihydrochloride, an acid solution and an aldehyde solution according to a molar ratio of (0.9-1.5) to (4.8-5.3) to (2.5-3.4) to react to generate N, N, N ', N' -tetramethyl cystamine;

(2) mixing N, N, N ', N' -tetramethyl cystamine and halogenated alkane according to the molar ratio of (0.9-1.5) to (1.8-2.3) to react to generate the surfactant containing the disulfide bond;

wherein the halogenated alkane is one or a mixture of more of chlorinated alkane, brominated alkane or iodoalkane with the carbon chain length of 8-18.

2. The method for preparing the bacteriostatic agent containing the disulfide bond according to claim 1, wherein in the step (1), the acid solution is formic acid solution or acetic acid solution, and the aldehyde solution is formaldehyde solution or acetaldehyde solution.

3. The method for preparing the bacteriostatic agent containing the disulfide bond according to claim 1, wherein in the step (1), the reaction temperature is controlled to be-10 to 50 ℃, the reaction pH is controlled to be 7 to 12, and the reaction time is controlled to be 0.5 to 72 hours.

4. Use of the bacteriostatic agent containing disulfide bonds according to claim 1 in detergents, hand washing solutions and cosmetics.

5. The use according to claim 4, wherein the bacteria comprise Escherichia coli, Staphylococcus aureus, Candida albicans, Bacillus cereus and Pseudomonas aeruginosa.

6. The use of claim 4, wherein the bacteriostatic agent has a minimum inhibitory concentration against E.coli of 62.5 mg/L.

7. The use of claim 4, wherein the bacteriostatic agent has a minimum inhibitory concentration against Staphylococcus aureus of 62.5 mg/L.

8. The use of claim 4, wherein the bacteriostatic agent has a minimum inhibitory concentration of 62.5mg/L against Candida albicans.

9. The use of claim 4, wherein the bacteriostatic agent has a minimum inhibitory concentration of 62.5mg/L against Bacillus cereus and Pseudomonas aeruginosa.

Technical Field

The invention relates to the technical field of bacteriostatic agents, and particularly relates to a preparation method and application of a bacteriostatic agent containing disulfide bonds.

Background

In daily life, although people are always exposed to an environment full of bacterial fungi, most of the bacterial fungi do not cause harm to people. In some special environments or locations, some method is needed to inhibit the growth of bacterial fungi and even kill these microorganisms. For example, in oil production, the pipelines thereof are corroded due to the existence of bacteria, so that the production efficiency is greatly reduced. Therefore, daily chemicals and industrial chemicals with the sterilization function, such as hand sanitizer, laundry detergent, disinfection gel and the like, are produced at the same time. However, most of the existing bactericides have poor biocompatibility and biodegradability, so that the safety is poor, and the bactericides cannot be applied to the field of biological medicines.

Disulfide bonds are chemical bonds linking the sulfhydryl groups of two different cysteine residues in different peptide chains or in the same peptide chain, which are widely present in proteins and biological macromolecules and therefore have better biocompatibility than some other groups. Therefore, the novel bacteriostatic agent with good biocompatibility is constructed based on the disulfide bond, and has wide application prospect.

Disclosure of Invention

The invention aims to solve the technical problem of providing a preparation method of a bacteriostatic agent containing disulfide bonds, wherein the bacteriostatic agent has a structure with two cationic head groups, shows good bacteriostatic effects on three common living bacteria, namely escherichia coli, staphylococcus aureus and candida albicans, and is a novel broad-spectrum bacteriostatic agent; meanwhile, the bacteriostatic agent containing the disulfide bond has good biocompatibility and biodegradability and better safety.

In order to solve the technical problems, the invention provides the following technical scheme:

in a first aspect, the present invention provides a method for preparing a bacteriostatic agent containing disulfide bonds, wherein the surface bacteriostatic agent has a structural formula shown in formula (I):

wherein n is an integer of 1-3, m is an integer of 7-17, and X is Cl, Br, I;

the preparation method comprises the following steps:

(1) under an alkaline condition, mixing cystamine dihydrochloride, an acid solution and an aldehyde solution according to a molar ratio of (0.9-1.5) to (4.8-5.3) to (2.5-3.4) to react to generate N, N, N ', N' -tetramethyl cystamine;

(2) mixing N, N, N ', N' -tetramethyl cystamine and halogenated alkane according to the molar ratio of (0.9-1.5) to (1.8-2.3) to react to generate the surfactant containing the disulfide bond;

wherein the halogenated alkane is one or a mixture of more of chlorinated alkane, brominated alkane or iodoalkane with the carbon chain length of 8-18.

In a preferred embodiment of the present invention, N ═ 2, m ═ 11, and X ═ Br, when the surfactant is (dithiobis-2, 1-ethanediyl) -bis (N-dodecyl-N, N-dimethylammonium bromide), having a formula as shown in formula (ii):

further, the acid solution is a formic acid solution or an acetic acid solution, and the aldehyde solution is a formaldehyde solution or an acetaldehyde solution.

Further, in the step (1), the reaction temperature is controlled to be-10-50 ℃, the reaction pH is controlled to be 7-12, and the reaction time is controlled to be 0.5-72 h.

In a second aspect, the invention also provides the application of the bacteriostatic agent containing the disulfide bond, and the application fields include but are not limited to detergents, hand washing solutions and cosmetics.

Further, the bacteria include, but are not limited to, Escherichia coli, Staphylococcus aureus, Candida albicans, Bacillus cereus, and Pseudomonas aeruginosa.

Further, when the bacteriostatic agent containing the disulfide bond is used, an aqueous phase solution needs to be prepared, and the aqueous phase is sterilized distilled water.

Further, the minimum inhibitory concentration of the bacteriostatic agent on escherichia coli is 62.5 mg/L.

Further, the minimum inhibitory concentration of the bacteriostatic agent on staphylococcus aureus is 62.5 mg/L.

Further, the minimum inhibitory concentration of the bacteriostatic agent on candida albicans is 62.5 mg/L.

Further, the minimum inhibitory concentration of the bacteriostatic agent on the bacillus cereus and the pseudomonas aeruginosa is 62.5 mg/L.

Compared with the prior art, the invention has the beneficial effects that:

1. the surface active agent containing disulfide bonds has good broad-spectrum antibacterial performance. Experiments prove that the minimum inhibitory concentration of the surfactant containing the disulfide bond to escherichia coli, staphylococcus aureus, candida albicans, bacillus cereus and pseudomonas aeruginosa is 62.5 mg/L; compared with polylysine and polylysine hydrochloride, the bacteriostatic agent has better bacteriostatic effect and lower minimum bacteriostatic concentration.

2. Compared with other common cationic surfactants, the disulfide bond in the structure of the bacteriostatic agent increases the compatibility and biodegradability of the bacteriostatic agent in organisms, and the characteristic also enables the bacteriostatic agent to have wider application prospect in the field of biological medicines.

Drawings

FIG. 1 shows the NMR of (dithiobis-2, 1-ethanediyl) -bis (N-dodecyl-N, N-dimethylammonium bromide)¹H NMR spectrum;

FIG. 2 shows the inhibition zone sizes of polylysine (epsilon-PL) and polylysine hydrochloride (epsilon-PL. HCl) at different bacterial concentrations;wherein the upper left is epsilon-PL & HCl with the concentration of 10^-5mg/L, lower left is epsilon-PL & HCl, concentration is 10^-6mg/L; the upper right is epsilon-PL with a concentration of 10^-6mg/L, epsilon-PL at the lower right, concentration of 10^-5mg/L。

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The experimental methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used therein are commercially available without otherwise specified.

In the following examples, amidopropyldimethyl tertiary amine oleate (PKO), polylysine and polylysine hydrochloride (. epsilon. -PL. HCl) were obtained commercially. The adopted strain is purchased from northern Nay organisms and is preserved in the collaborative innovation center C212 of the chemical industry institute of south Jiangnan university, wherein the model of escherichia coli is ATCC 22922, the model of staphylococcus aureus is ATCC 6538, the model of candida albicans is ATCC 10231, the model of bacillus cereus is ATCC 11778, and the model of pseudomonas aeruginosa is ATCC 27853.

Example 1: synthesis of (dithiobis-2, 1-ethanediyl) -bis (N-dodecyl-N, N-dimethylammonium bromide)

Under the alkaline condition, reacting cystamine dihydrochloride with a formic acid solution and a formaldehyde solution according to the molar ratio of 1:5:3 to generate N, N, N ', N' -tetramethyl cystamine. Then purifying the N, N, N ', N' -tetramethyl cystamine, and mixing the purified N, N, N ', N' -tetramethyl cystamine with bromododecane according to the molar ratio of 1:2 to finally generate the dimeric bacteriostat (dithiobis-2, 1-ethanediyl) -bis (N-dodecyl-N, N-dimethyl ammonium bromide) containing the disulfide bond.

Test of bacteriostatic Property

1. Preparation of culture Medium

Mixing 5g beef extract, 10g peptone, 5g NaCl and 1L distilled water, adjusting pH to 7.2-7.4, and autoclaving at 121 deg.C for 15min to obtain LB culture medium.

Mixing 5g of peptone, 1g of monopotassium phosphate, 2g of yeast extract powder, 0.5g of magnesium sulfate, 20g of glucose and 1L of distilled water, adjusting the pH value to about 6.4, and then carrying out autoclaving at 121 ℃ for 15min to obtain the improved martin culture medium.

Mixing 15g tryptone, 5g soybean peptone, 5g sodium chloride and 1L distilled water, adjusting pH to 7.2-7.4, and autoclaving at 121 deg.C for 15min to obtain TSB culture medium.

2. Preparing bacterial suspension

According to 1 × 10⁶And respectively inoculating escherichia coli and staphylococcus aureus into an LB (lysostaphin-associated) culture medium at the inoculation concentration of CFU/mL, and culturing for 24 hours in a 37-DEG C incubator to obtain an escherichia coli bacterial suspension and a staphylococcus aureus bacterial suspension.

According to 1 × 10⁶Inoculation concentration of CFU/mL Candida albicans is inoculated into Martin culture medium, and cultured in a thermostat at 28 ℃ for 24h to obtain Candida albicans suspension.

According to 1 × 10⁶Inoculating the bacillus cereus and the pseudomonas aeruginosa in a TSB culture medium at the inoculation concentration of CFU/mL, and culturing for 24 hours in a 37-DEG C incubator to obtain a bacillus cereus and pseudomonas aeruginosa suspension.

3. Minimum inhibitory concentration test

The Minimum Inhibitory Concentration (MIC) was determined by the fold dilution method: bacteriostatic agents (dithiodi-2, 1-ethanediyl) -di (N-dodecyl-N, N-dimethyl ammonium bromide) and contrast substances (polylysine and polylysine hydrochloride) are sequentially diluted into a series of concentrations by using sterile water. Adding the liquid medicine to be tested into 96-well plate, respectively, wherein 50 microliters of test liquid and 50 microliters of prepared bacterial suspension (1 × 10) are added into each small hole⁶CFU/mL), sterile water 100 microliters of negative control and 100 microliters were added to each groupThe inoculum solution was used as a positive control. And placing the prepared 96-well plate in an incubator at a corresponding temperature for 24h, and observing, wherein the lowest concentration corresponding to the wells without turbidity is taken as the minimum inhibitory concentration of the sample. The results obtained are shown in table 1.

TABLE 1 comparison of the bacteriostatic properties of the bacteriostatic agents according to the invention with other bacteriostatic substances

As can be seen from Table 1, the bacteriostatic agents (dithiobis-2, 1-ethanediyl) -bis (N-dodecyl-N, N-dimethylammonium bromide) of the invention have the minimum bacteriostatic concentration of 62.5mg/L on Escherichia coli, Staphylococcus aureus, Candida albicans, Bacillus cereus and Pseudomonas aeruginosa; compared with the PKO of less than 500mg/L, the antibacterial property is more excellent. As a natural food additive, the epsilon-PL & HCl has good bacteriostatic performance, and the minimal inhibitory concentration of the epsilon-PL & HCl is compared with the minimal inhibitory concentration of the epsilon-PL & HCl, so that the epsilon-PL & HCl and epsilon-PL are superior to the bacteriostatic performance of the epsilon-PL & HCl and epsilon-PL. Therefore, the bacteriostatic agent disclosed by the invention has a good bacteriostatic effect on common living bacteria such as escherichia coli, staphylococcus aureus, candida albicans and the like, has a broad-spectrum bacteriostatic characteristic, and can be applied to a plurality of fields such as detergents, hand washing liquids and cosmetics. In addition, the bacteriostatic agent has good biocompatibility and biodegradability, and is expected to be applied to the field of biological medicines.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.