阅读说明：本技术 一种具有抗菌功能的双子表面活性剂及其制备方法 (Gemini surfactant with antibacterial function and preparation method thereof ) 是由 孟祥凯 李正利 赵建国 郭照民 张明勇 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种具有抗菌功能的双子表面活性剂及其制备方法,所述制备方法包括如下步骤：将丁二酸与烷基伯醇进行酯化反应,制得丁二酸烷基伯醇酯；将氨基多糖与季铵化乙酸乙酯进行反应,制得季铵化糖；将丁二酸烷基伯醇酯与季铵化糖进行酯化反应,制得所述具有抗菌功能的双子表面活性剂；本发明制备方法通过特定原料以及制备工艺的限定,使得制备得到的双子表面活性剂具有优异的表面张力和抑菌性能,尤其是对大肠杆菌和金黄色葡萄球菌具有优异的抗菌率。(The invention discloses a gemini surfactant with an antibacterial function and a preparation method thereof, wherein the preparation method comprises the following steps: carrying out esterification reaction on succinic acid and alkyl primary alcohol to prepare succinic acid alkyl primary alcohol ester; reacting the aminopolysaccharide with quaternized ethyl acetate to obtain quaternized sugar; carrying out esterification reaction on alkyl primary alcohol succinate and quaternized sugar to prepare the bi-surfactant with the antibacterial function; the gemini surfactant prepared by the preparation method disclosed by the invention has excellent surface tension and antibacterial performance, and especially has excellent antibacterial rate on escherichia coli and staphylococcus aureus by the limitation of specific raw materials and preparation processes.)

1. A preparation method of gemini surfactant with antibacterial function is characterized by comprising the following steps:

(a) carrying out esterification reaction on succinic acid and alkyl primary alcohol to prepare succinic acid alkyl primary alcohol ester;

(b) reacting the aminopolysaccharide with quaternized ethyl acetate to obtain quaternized sugar;

(c) and (3) carrying out esterification reaction on alkyl primary succinate and quaternized sugar to prepare the gemini surfactant with the antibacterial function.

2. The preparation method of claim 1, wherein the molar ratio of the succinic acid to the primary alkyl alcohol is (1.05-1.1) to 1.

3. The preparation method according to claim 1 or 2, wherein the primary alkyl alcohol is a primary aliphatic alcohol having 12 to 16 carbon atoms.

4. The method according to claim 1, wherein the esterification reaction is carried out at 65-75 ℃ for 2-4 h in the step (a).

5. The method according to claim 1, wherein the esterification reaction is carried out in step (a) using chloroform as a solvent and an acidic cation exchange resin as a catalyst.

6. The method according to claim 1, wherein the aminopolysaccharide is an amino-chitosan oligosaccharide, and the degree of polymerization of the amino-chitosan oligosaccharide is 2 to 8.

7. The preparation method according to claim 1, wherein in the step (b), the molar ratio of the aminopolysaccharide to the quaternized ethyl acetate is 1: 1-3.

8. The preparation method according to claim 1, wherein in the step (b), the reaction temperature is 85-95 ℃ and the reaction time is 3-5 h; the catalyst used in the reaction process is acidic cation exchange resin.

9. The preparation method of claim 1, wherein in the step (c), the molar ratio of the alkyl primary succinate to the quaternized sugar is (1.5-2.5) to 1;

the esterification reaction temperature is 60-70 ℃, the time is 2-3 h, and the adopted catalyst is acidic cation exchange resin.

10. The gemini surfactant with antibacterial function prepared by the preparation method of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of surfactants, in particular to a gemini surfactant with an antibacterial function and a preparation method thereof.

Background

The gemini surfactant refers to a surfactant formed by linking two or more identical or nearly identical surfactant monomers together through chemical bonds, wherein the amphiphilic components are linked together by a linking group at or near a hydrophilic head group.

At present, gemini surfactants are diversified in types, but cannot meet the requirements of various industries, so that the synthesis of a surfactant with mild reaction conditions and high surface activity is receiving more and more attention. The special surfactant often has unique physicochemical properties such as high surface activity, high stability, high temperature resistance and the like, but a gemini surfactant with an antibacterial function is not seen yet.

Disclosure of Invention

The invention aims to provide a gemini surfactant with an antibacterial function and a preparation method thereof, wherein the gemini surfactant has excellent surface tension and antibacterial performance, and particularly has excellent antibacterial rate on escherichia coli and staphylococcus aureus.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

the invention provides a preparation method of gemini surfactant with antibacterial function, which comprises the following steps:

(a) carrying out esterification reaction on succinic acid and alkyl primary alcohol to prepare succinic acid alkyl primary alcohol ester;

(b) reacting the aminopolysaccharide with quaternized ethyl acetate to obtain quaternized sugar;

(c) and (3) carrying out esterification reaction on alkyl primary succinate and quaternized sugar to prepare the gemini surfactant with the antibacterial function.

Preferably, the molar ratio of the succinic acid to the primary alkyl alcohol is (1.05-1.1) to 1.

Preferably, the alkyl primary alcohol is an aliphatic primary alcohol with 12-16 carbon atoms.

Preferably, in the step (a), the esterification reaction temperature is 65-75 ℃ and the time is 2-4 h.

Preferably, in the step (a), the solvent used for the esterification reaction is chloroform, and the catalyst is an acidic cation exchange resin.

Preferably, the aminopolysaccharide is amino chitosan oligosaccharide, and the polymerization degree of the amino chitosan oligosaccharide is 2-8.

Preferably, in the step (b), the molar ratio of the aminopolysaccharide to the quaternized ethyl acetate is 1: 1-3.

Preferably, in the step (b), the reaction temperature is 85-95 ℃, and the reaction time is 3-5 h; the catalyst used in the reaction process is acidic cation exchange resin.

Preferably, in the step (c), the molar ratio of the alkyl primary succinate to the quaternized sugar is (1.5-2.5) to 1;

the esterification reaction temperature is 60-70 ℃, the time is 2-3 h, and the adopted catalyst is acidic cation exchange resin.

The invention provides a gemini surfactant with an antibacterial function, which is prepared by the preparation method.

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

the gemini surfactant prepared by the preparation method disclosed by the invention has excellent surface tension and antibacterial performance, and especially has excellent antibacterial rate on escherichia coli and staphylococcus aureus by the limitation of specific raw materials and preparation processes.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the following embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

The following examples were prepared using the following raw materials:

succinic acid: from Shanghai Aladdin Biotechnology, Inc.;

primary alkyl alcohol: c12 primary aliphatic alcohol, available from Shanghai Aladdin Biotechnology GmbH;

chloroform: from Shanghai Aladdin Biotechnology, Inc.;

acidic cation exchange resin: particularly strong acid cation exchange resin, which is purchased from Shanghai Kaiping resin Co., Ltd;

amino-chitosan oligosaccharide: the polymerization degrees are respectively 2, 6, 7 and 8, and are from Qingdao Honghai biotechnology limited company;

quaternization of ethyl acetate: from Runxin chemical, Inc., of Shandong province.

Example 1

The embodiment is a preparation method of gemini surfactant with antibacterial function, which comprises the following steps:

(a) adding succinic acid and C12 primary aliphatic alcohol into chloroform according to the molar ratio of the succinic acid to the C12 primary aliphatic alcohol of 1.05: 1, and carrying out esterification reaction for 2h at 65 ℃ by using acid cation exchange resin as a catalyst to prepare primary alkyl succinate;

(b) according to the mol ratio of 1: 1 of the amino-chitosan oligosaccharide and the quaternized ethyl acetate, reacting the amino-chitosan oligosaccharide (with polymerization degree of 2) with the quaternized ethyl acetate at 85 ℃ for 3 hours under the condition that acidic cation exchange resin is used as a catalyst to prepare quaternized sugar;

(c) according to the mole ratio of 2: 1 of the alkyl primary alcohol succinate to the quaternized sugar, the alkyl primary alcohol succinate and the quaternized sugar react for 3 hours at 60 ℃ under the condition that acidic cation exchange resin is used as a catalyst, and the gemini surfactant with the antibacterial function is prepared.

Example 2

The embodiment is a preparation method of gemini surfactant with antibacterial function, which comprises the following steps:

(a) adding succinic acid and C12 primary aliphatic alcohol into chloroform according to the molar ratio of the succinic acid to the C12 primary aliphatic alcohol of 1.1: 1, and carrying out esterification reaction for 4h at 75 ℃ by using acid cation exchange resin as a catalyst to prepare primary alkyl succinate;

(b) according to the mol ratio of the amino-chitosan oligosaccharide to the quaternized ethyl acetate of 1: 3, reacting the amino-chitosan oligosaccharide (with the polymerization degree of 8) with the quaternized ethyl acetate at 95 ℃ for 5 hours under the condition of taking acid cation exchange resin as a catalyst to prepare quaternized sugar;

(c) according to the mole ratio of 2: 1 of the alkyl primary alcohol succinate to the quaternized sugar, the alkyl primary alcohol succinate and the quaternized sugar react for 2 hours at 70 ℃ under the condition that acidic cation exchange resin is used as a catalyst, and the gemini surfactant with the antibacterial function is prepared.

Example 3

The embodiment is a preparation method of gemini surfactant with antibacterial function, which comprises the following steps:

(a) adding succinic acid and C12 primary aliphatic alcohol into chloroform according to the molar ratio of the succinic acid to the C12 primary aliphatic alcohol of 1.1: 1, and carrying out esterification reaction for 3h at 65 ℃ by using acidic cation exchange resin as a catalyst to prepare primary alkyl succinate;

(b) according to the mol ratio of the amino-chitosan oligosaccharide to the quaternized ethyl acetate of 1: 2, reacting the amino-chitosan oligosaccharide (with polymerization degree of 6) with the quaternized ethyl acetate at 85 ℃ for 4 hours under the condition that acidic cation exchange resin is used as a catalyst to prepare quaternized sugar;

(c) according to the mole ratio of 2: 1 of the alkyl primary alcohol succinate to the quaternized sugar, the alkyl primary alcohol succinate and the quaternized sugar react for 3 hours at 65 ℃ under the condition that acidic cation exchange resin is used as a catalyst, and the gemini surfactant with the antibacterial function is prepared.

Example 4

The embodiment is a preparation method of gemini surfactant with antibacterial function, which comprises the following steps:

(a) adding succinic acid and C12 primary aliphatic alcohol into chloroform according to the molar ratio of the succinic acid to the C12 primary aliphatic alcohol of 1.08: 1, and carrying out esterification reaction for 3h at 70 ℃ by using acid cation exchange resin as a catalyst to prepare primary alkyl succinate;

(b) according to the mol ratio of the amino-chitosan oligosaccharide to the quaternized ethyl acetate of 1: 2, reacting the amino-chitosan oligosaccharide (with the polymerization degree of 7) with the quaternized ethyl acetate at 90 ℃ for 3.5 hours under the condition that acidic cation exchange resin is used as a catalyst to prepare quaternized sugar;

(c) according to the mole ratio of 2: 1 of the alkyl primary alcohol succinate to the quaternized sugar, the alkyl primary alcohol succinate and the quaternized sugar react for 3 hours at 70 ℃ under the condition that acidic cation exchange resin is used as a catalyst, and the gemini surfactant with the antibacterial function is prepared.

Comparative example 1

This comparative example is a method for preparing a gemini surfactant having an antibacterial function, which is substantially the same as the preparation method of example 4 except that the molar ratio of the amino chitosan oligosaccharide to the quaternized ethyl acetate in step (b) is 1: 4.

Comparative example 2

This comparative example is a method for preparing a gemini surfactant having an antibacterial function, which is substantially the same as the preparation method of example 4 except that the reaction temperature in step (b) is 80 ℃.

Comparative example 3

This comparative example is a preparation method of gemini surfactant having antibacterial function, which is substantially the same as the preparation method of example 4 except that the molar ratio of alkyl primary succinate to quaternized sugar in step (c) is 1: 1.

Examples of the experiments

Preparing the gemini surfactant with the antibacterial function according to the preparation methods in the embodiments 1-4 and the comparative examples 1-3 respectively; the performance test was carried out according to the following methods, respectively:

1. surface tension test: the hanging plate method (also known as Wilhelmy) is a method for measuring interfacial and surface tension; suspending a thin sheet of mica or a microscope slide on one arm of a balance and then immersing in liquid; the sling method can also be used to measure the change in surface tension in a static manner. The change in surface tension is measured by measuring the change in force required to hold the blade in the submerged position.

2. Tests for the antibacterial function of the surfactants (calculated as the number of colonies) were carried out with reference to GB15981-1995, Q/02GZS001 test method and standard.

The above tests were all set up in triplicate, and the data are the average of triplicate.

TABLE 1 surface tension and antimicrobial function of surfactants

As can be seen from Table 1:

the gemini surfactant with the antibacterial function, which is prepared by the embodiment of the invention, has excellent antibacterial performance and surface tension, and can better meet market demands; in addition, the comprehensive performance of the prepared surfactant can be better improved by controlling the proportion of the raw materials and the reaction parameters.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.