CN110313487B - Novel leather mildew-proof nursing agent and preparation method and application thereof - Google Patents

Novel leather mildew-proof nursing agent and preparation method and application thereof Download PDF

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CN110313487B
CN110313487B CN201910543733.2A CN201910543733A CN110313487B CN 110313487 B CN110313487 B CN 110313487B CN 201910543733 A CN201910543733 A CN 201910543733A CN 110313487 B CN110313487 B CN 110313487B
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leather
ion pair
lae
acid
mildew
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CN110313487A (en
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易正芳
邵婷
仇文卫
王李婷
刘明耀
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East China Normal University
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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    • A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
    • A01N47/40—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having a double or triple bond to nitrogen, e.g. cyanates, cyanamides
    • A01N47/42—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having a double or triple bond to nitrogen, e.g. cyanates, cyanamides containing —N=CX2 groups, e.g. isothiourea
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    • C07C279/04—Derivatives of guanidine, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of guanidine groups bound to acyclic carbon atoms of a carbon skeleton
    • C07C279/14—Derivatives of guanidine, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of guanidine groups bound to acyclic carbon atoms of a carbon skeleton being further substituted by carboxyl groups
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    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
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Abstract

The present invention provides a preservative or mildewproof type for leather or leather care agents comprising lauroyl arginine ethyl ester (LAE) and ion pair derivatives thereof. The invention also provides a method for preparing the preservative or mildew-proof type of the leather or leather care agent and the leather mildew-proof agent or mildew-proof type care agent prepared by the method. The leather mildew preventive or mildew-proof nursing agent has the characteristics of being natural, non-toxic, efficient in bacteriostasis, easy to degrade and environment-friendly.

Description

Novel leather mildew-proof nursing agent and preparation method and application thereof
Technical Field
The invention relates to a leather mildew-proof nursing agent or mildew-proof nursing agent, in particular to a mildew-proof nursing agent or mildew-proof nursing agent containing lauroyl arginine ethyl ester derivatives (ion pair compounds), wherein the lauroyl arginine ethyl ester ion pair has an antibacterial effect, can help the nursing agent to exert a nursing function, and can also keep the nursing agent stable and exert the antibacterial and antiseptic effects.
Background
The natural leather is rich in protein and lipid substances, is easily attacked and eroded by fungi in the tanning and storage processes, and can bring great influence on the quality and appearance of the leather. In order to prevent the leather and leather products from mildewing, a mildew preventive is added in the leather making process to inhibit the growth of fungi. The traditional leather mildew preventive trichlorophenol is forbidden due to the problem of environmental protection and safety, and the mildew preventive commonly used in the industry at present is 2-thiocyanomethyl thiobenzothiazole (TCMTB), which is a high-efficiency environment-friendly mildew preventive developed by Bakman company in the United states. However, as the mildew preventive is used in the industry for a long time, the drug resistance of fungi is stronger, the mildew preventive effect of the mildew preventive is greatly reduced, and the actual requirement is difficult to meet. To solve the problem, US 6110950 discloses a composition containing propiconazole and 2-thiocyanomethylthio benzothiazole, US 20060014810 discloses a composition containing 2,4,4 '-trichloro-2' -hydroxydiphenyl ether (triclosan) and 4-tolyl-diiodomethylsulfone, and the two compositions can be used for leather mildew prevention, but the mildew prevention effect is not ideal enough and cannot meet the actual requirement.
In addition, the leather product is easy to adsorb dust under natural conditions, if the used leather product is not cleaned and cared, the leather product is easy to mildew, mildew grows on the leather, light people can make the leather lose luster, and heavy people can erode leather fibers by enzyme secreted by the mildew, so that the grain surface is brittle and moldy, the physical and mechanical properties of the leather are reduced, and the service life of the leather product is shortened. Particularly in the wet and rainy areas in the south, the mildew-proof care of the leather is particularly necessary. The existing leather care agent mostly aims at enhancing the softness and brightness of leather, and has weak mildew resistance.
Chinese patent application 2017111358451, a manufacturing method of an environment-friendly leather mildew preventive, discloses a leather mildew preventive comprising polyethylene, sodium chlorite, metasilicic acid, plant essential oil, alkyl glycoside, fatty acid sulfoalkyl ester, fluorine-containing silicone oil and animal fat leather fatliquoring agent. The mildew preventive is added with components with different properties, so that the mildew preventive not only has strong antibacterial and mildew-proof effects, but also has nourishing and protecting effects on leather. However, the mildew preventive contains a toxic component sodium chlorite as a main bacteriostatic component, and a plurality of organic components are required to be added, so that the composition has too long degradation time and has certain influence on the environment.
Chinese patent application 2017106699348, a leather mildew preventive and a preparation method thereof, discloses a leather mildew preventive containing propiconazole, sodium pyrithione, iodopropynyl butyl carbamate and an emulsifier, and the leather mildew preventive is subjected to mildew preventive treatment by three active bacteriostatic components of propiconazole, sodium pyrithione and iodopropynyl butyl carbamate, so that the bacteriostatic spectrum of the mildew preventive is widened, and the synergistic effect is increased. However, the mildew preventive is still aimed at killing microorganisms by using toxic compounds so as to overcome the problem of drug resistance which often occurs in the existing leather mildew preventive, and the long-term use of the mildew preventive still has influence on the environment.
Chinese patent application 2015108899157, "leather mildew-proof nursing agent" discloses a mildew-proof agent containing N- (2, 2-dichloroethylene) salicylamide, N-octyl-4-isothiazoline-3-ketone and nano zinc oxide and a leather nursing agent prepared by the mildew-proof agent, wherein the leather mildew-proof effect is improved and the storage stability of the leather is increased mainly by the toxic action of N- (2, 2-dichloroethylene) salicylamide, N-octyl-4-isothiazoline-3-ketone and nano zinc oxide. However, the mildewcide still needs toxic components to the environment and organisms, and the environment is still influenced after long-term use.
Therefore, the research on the natural non-toxic leather mildew preventive and the leather care agent prepared by the natural non-toxic leather mildew preventive become a research hotspot in leather products.
Lauroyl arginine Ethyl ester (LAE) is an organic substance formed by condensing fatty acid and dibasic amino acid, is a white hygroscopic solid, is chemically stable within the pH range of 3-7, has a melting point of 50-58 ℃, can be dispersed in 1kg of water at the temperature of 247g, and has a distribution coefficient of more than 10 in water and oil, namely is mainly in the water phase. Researches find that the lauroyl arginine ethyl ester LAE has the characteristics of strong antibacterial capability, low biological toxicity, good in vivo metabolism effect and high environmental compatibility. The most representative characteristic is that no residue is left in the metabolism of lauroyl arginine ethyl ester, and related researches show that lauroyl arginine ethyl ester can be rapidly metabolized naturally in human bodies and animal bodies, is firstly hydrolyzed into Lauroyl Arginine (LAS) and ethanol, then LAS is hydrolyzed into naturally existing dietary components of lauric acid and arginine, the lauric acid is further metabolized into carbon dioxide and water, and the arginine is metabolized into ornithine, urea and carbon dioxide. All primary metabolites and final metabolites produced during the metabolism of lauroyl arginine ethyl ester are non-toxic and harmless, and are the same as the metabolites of food ingested daily by humans and animals in the body.
In 2005, LAE was approved by FDA as a GRAS (generally recognized as safe) food additive in the united states, approved by European Food Safety Administration (EFSA) for safe food certification in 2007, and listed as a standard of food additive general law by 2011 international committee on food code, and is approved as a preservative for 20 kinds of foods and fresh agricultural products.
Chinese patent application CN201710056593, entitled "fruit and vegetable preservative and preparation method and application thereof" discloses a composition taking lauroyl arginine ethyl ester hydrochloride and sodium methyl paraben as main active ingredients to be used as the fruit and vegetable preservative, and can effectively inhibit the growth of bacteria causing fruit and vegetable rot. However, the single bacteriostatic effect of the high-concentration methyl paraben sodium (2000 mug/ml) is better than that of the low-concentration LAE (1000 mug/ml) because the single-concentration sodium paraben sodium has a phenolic hydroxyl structure and the antibacterial performance is far stronger than that of benzoic acid and sorbic acid, so that on the premise of ensuring the preservative performance, the method definitely indicates that the use of the sodium paraben sodium instead of the LAE is helpful for reducing the dosage cost of the preservative.
Chinese patent application CN201510748675, entitled "method for inhibiting alcohol fermentation contaminating microorganisms by using lauroyl arginine ethyl ester", discloses a method for inhibiting alcohol fermentation contaminating microorganisms by using lauroyl arginine ethyl ester, which comprises adding LAE and salt compounds thereof into fermentation liquor of saccharomyces cerevisiae at a concentration of less than 50 μ g/ml, and can effectively inhibit the growth of lactic acid bacteria and control the growth of other contaminating microorganisms. However, this bacteriostatic slightly affects yeast growth to some extent and results in a 0.6% decrease in alcohol production.
Chinese patent application CN201610466729, entitled "a mild infant shampoo and bath bubble" discloses a mild infant shampoo and bath bubble, which is prepared by selecting disodium cocoyl glutamate, cocamidopropyl betaine, and sodium hydroxypropyl lauryl glucoside cross-linked polymer sulfonate as surfactant system, selecting camellia oil, alpha-glucan oligosaccharide/inulin complex as conditioning component, and flos Chrysanthemi Indici extract and lauroyl arginine ethyl ester HCl as antiseptic system, wherein the raw materials cooperate with each other, and has good cleaning effect, mildness and no irritation.
At present, there is no report of using LAE and its derivatives for leather mildewcide or mildewproof care agent. Facing the largest leather processing market in the world, China needs a new efficient, nontoxic and stable leather mildew preventive or mildew-proof care agent.
In conclusion, research on LAE has been carried out in the prior art, but no related report on the use of LAE, even LAE derivatives, in the preparation of leather mildew-proof care agents is found.
Disclosure of Invention
The prior inventions do not teach the use of a single LAE component as a leather mildewcide or mildewproof conditioner, nor do they disclose a suitable concentration of LAE for use as a leather mildewcide or mildewproof conditioner. Therefore, on one hand, the LAE is used for the research of leather mildew preventive or mildew preventive care agent for the first time by utilizing the bacteriostatic effect of the preservative, and the proper use concentration is determined through experiments, so that the negative effects on the environment are small and the toxic and side effects are low while the effective antibacterial and disease preventing effects are achieved. On the other hand, on the basis of the research, according to the characteristics that the lauroyl arginine ethyl ester LAE has strong antibacterial ability, low biotoxicity, good in vivo metabolism effect, high environmental compatibility and no reaction with other compounds at normal temperature, the LAE is further improved to obtain a novel derivative, namely, the LAE and organic acid salt are subjected to condensation reaction, so that the LAE ion pair compound is obtained. The ion pair compound is used as a leather mildew preventive or mildew preventive care agent component, and has the advantages of better bacteriostatic effect and lower dosage compared with LAE, so that the preparation of a natural, nontoxic and stable leather mildew preventive or mildew preventive care agent is facilitated. Wherein the LAE or ion pair compound component thereof is used as a main or sole bacteriostatic and preservative component.
Therefore, the first invention aims to provide the application of lauroyl arginine ethyl ester LAE in preparing an environment-friendly and non-toxic leather mildew preventive or mildew preventive care agent.
In one embodiment, the LAE comprises a lauroyl arginine ethyl ester compound of formula (I) (LAE compound) or a hydrate or pharmaceutically acceptable salt thereof.
Figure BDA0002103355210000031
Wherein the content of the first and second substances,
x is halogen or HSO4(ii) a Preferably, Br, Cl or HSO4；
R1Is a linear saturated fatty acid group having 8 to 14 carbon atoms, or a linear oxoacid group having 8 to 14 carbon atoms.
R2Is a linear fatty acid group having 1 to 18 carbon atoms, or a branched fatty acid group having 1 to 18 carbon atoms, or an aromatic group having 1 to 18 carbon atoms, or a linear group having 1 to 4 carbon atoms.
R3Is one of the following structures:
Figure BDA0002103355210000041
n ranges from 0 to 4.
In a preferred embodiment, X is Cl and the compound of formula (I) is lauroyl arginine ethyl ester hydrochloride (LAEHCl) having the formula (II):
Figure BDA0002103355210000042
wherein, the mass percentage concentration of the LAE in the leather mildew preventive or mildew preventive care agent is 0.001-2%; preferably 0.001-0.01%, 0.01-0.1%, 0.05-0.1%, 0.1-0.2%, 0.1-1%, 1-2% or 1.5-2%, further preferably 0.1-1% or 0.1-0.2%.
The second invention of the invention is to provide the use of the LAE ion pair compound for preparing an environment-friendly and nontoxic leather mildew preventive or mildew preventive care agent, wherein the LAE ion pair compound has a structural formula shown as the following formula (III):
Figure BDA0002103355210000043
in one embodiment, wherein said RCOO-The organic acid or salt is selected from salicylic acid, formic acid, ammonium formate, calcium formate, acetic acid, sodium diacetate, propionic acid, ammonium propionate, sodium propionate, calcium propionate, butyric acid, sodium butyrate, lactic acid, benzoic acid, sodium benzoate, sorbic acid, sodium sorbate, potassium sorbate, fumaric acid, citric acid, potassium citrate, sodium citrate, calcium citrate, tartaric acid, malic acid, phosphoric acid, sodium carbonate, oxalic acid or carbonic acid having antibacterial activity. In a preferred embodiment, the organic acid salt is selected from the group consisting of nicotinic acid, tartaric acid, oxalic acid.
In one embodiment, the LAE ion pair is present in the leather mildewcide or mildewproof care agent in a concentration of 0.001 to 2% by mass; preferably, from 0.001 to 0.01%, from 0.01 to 0.1%, from 0.05 to 0.1%, from 0.1 to 0.2%, from 0.1 to 1%, from 1 to 2% or from 1.5 to 2%; further preferably, it is 0.1 to 1% or 0.1 to 0.2%.
The third invention of the present invention is to provide a method for preparing an environment-friendly and nontoxic leather mildew preventive or mildew preventive care agent containing the above LAE ion pair compound, comprising the steps of:
(1) heating and dissolving the compound shown in the formula (II), and then adding an organic acid salt solution shown in the formula (III);
(2) fully stirring and uniformly mixing, and reacting under the condition of heating to obtain the LAE ion pair compound, wherein the reaction is shown as the following reaction formula:
Figure BDA0002103355210000051
wherein, the RCOO-The organic acid or salt is selected from salicylic acid, formic acid, ammonium formate, calcium formate, acetic acid, sodium diacetate, propionic acid, ammonium propionate, sodium propionate, calcium propionate, butyric acid, sodium butyrate, lactic acid, benzoic acid, sodium benzoate, sorbic acid, sodium sorbate, potassium sorbate, fumaric acid, citric acid, potassium citrate, sodium citrate, calcium citrate, tartaric acid, malic acid, phosphoric acid, sodium carbonate, oxalic acid or carbonic acid having antibacterial activity;
(3) after full reaction, cooling to room temperature, purifying and then drying in vacuum to prepare the lauroyl arginine ethyl ester organic acid ion pair compound shown in the formula (II);
(4) and adding the matrix solution into a container at normal temperature and normal pressure, adding the LAE ion pair compound, and fully stirring through pump circulation to obtain the environment-friendly and nontoxic leather mildew preventive or mildew preventive care agent.
In the step (1), the heating and dissolving temperature is 50-100 ℃; preferably, it is 90 ℃.
In the step (2), the reaction temperature is 50-100 ℃; preferably, it is 90 ℃.
In the step (2), the reaction time is 50-100 ℃; preferably, it is 90 ℃.
In the step (3), the vacuum drying condition is 50-100 ℃; preferably, it is 60 ℃.
In the step (4), the container is preferably made of stainless steel or inert material.
In one embodiment, wherein said RCOO-The organic acid or salt is selected from salicylic acid, formic acid, ammonium formate, calcium formate, acetic acid, sodium diacetate, propionic acid, ammonium propionate, sodium propionate, calcium propionate, butyric acid, sodium butyrate, lactic acid, benzoic acid, sodium benzoate, sorbic acid, sodium sorbate, potassium sorbate, fumaric acid, citric acid, potassium citrate, sodium citrate, calcium citrate, tartaric acid, malic acid, phosphoric acid, sodium carbonate, oxalic acid or carbonic acid having antibacterial activity. In a preferred embodiment, the organic acid salt is selected from sodium nicotinate, sodium tartrate, sodium oxalate.
In another embodiment, the RCOO-The preparation method of the organic acid salt comprises the following steps: adding the organic acid into a methanol solution, adding a proper amount of NaOH, stirring at room temperature until a white solid is separated out, carrying out suction filtration, and washing with methanol to obtain the organic acid salt.
The fourth object of the present invention is to provide a leather mildewcide or mildewproof care agent containing the LAE or the ion pair compound thereof as a bacteriostatic agent or a preservative.
In any of the above embodiments, the leather mildewcide or mildewproof conditioner refers to a component comprising the LAE or the ion pair derivative thereof in a matrix of a conventional leather mildewcide or mildewproof conditioner.
Terms and definitions:
lauroyl arginine Ethyl ester (LAE) is an organic matter formed by condensing fatty acid and dibasic amino acid, is a white hygroscopic solid, is stable in chemical property within the range of pH 3-7, has a melting point of 50-58 ℃, can be dispersed in 1kg of water at the temperature of 247g, and has a distribution coefficient of more than 10 in water and oil, namely is mainly in the water phase. Researches find that the lauroyl arginine ethyl ester LAE has the characteristics of strong antibacterial capability, low biological toxicity, good in vivo metabolism effect and high environmental compatibility. The most representative characteristic is that no residue is left in the metabolism of lauroyl arginine ethyl ester, and related researches show that the lauroyl arginine ethyl ester can be rapidly and naturally metabolized in human bodies and animal bodies to generate lauric acid and arginine which are further metabolized into ornithine, urea, carbon dioxide and water. All primary metabolites and final products generated in the metabolism process of lauroyl arginine ethyl ester are nontoxic and harmless, and are the same as the metabolites of foods ingested daily by human beings and animals in vivo.
The invention improves the derivatives of the LAE, breaks through the traditional thought of the development of the derivatives, namely, the derivatives are not limited to selecting the proper forms of acid, alkali and salt/ester which are traditionally suitable for the LAE, or the LEA is treated by acid, alkali, salt or esterification groups, but an acid radical group which can enhance the bacteriostatic synergistic effect of the LAE is creatively selected, and the acid radical group are combined into a new derivative, namely an ion pair compound, through the strong intermolecular ionic bond unconventionally, so that the application of the LAE derivatives in leather mildewproof agents or mildewproof care agents is remarkably improved.
Technical effects
The mildew-proof adhesive has the advantages that:
the LAE ion pair compound is creatively used to replace a bacteriostatic agent and a preservative in a leather mildew preventive or mildew preventive care agent, and the traditional mildew preventive adhesive has the advantages of low cost, simple preparation process and good stability, and simultaneously has the advantages of obvious bacteriostatic effect, single component, simple preparation, no harm to human bodies, easiness in biological catabolism, easiness in long-term storage and the like.
Drawings
FIG. 1: cation B of the LAE ion-pair Compound+ESI mass spectra of molecular ion peaks;
FIG. 2: anion A of LAE nicotinic acid ion pair compound-ESI mass spectra of molecular ion peaks;
FIG. 3: of LAE1Peak shape and chemical shift diagram of H-NMR;
FIG. 4: process for preparing nicotinic acid1Peak shape and chemical shift diagram of H-NMR;
FIG. 5: of the LAE nicotinic acid ion pair1Peak shape and chemical shift diagram of H-NMR;
FIG. 6: anion A of LAE tartrate ion pair compound-ESI mass spectrum of molecular ion peak.
Detailed Description
The present invention will be described in further detail with reference to the following specific examples and drawings, and the present invention is not limited to the following examples. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept, and the scope of the appended claims is intended to be protected. The procedures, conditions, reagents, experimental methods and the like for carrying out the present invention are general knowledge and common general knowledge in the art except for the contents specifically mentioned below, and the present invention is not particularly limited.
The first embodiment is as follows: preparation method of ion pair compound synthesized from lauroyl arginine ethyl ester hydrochloride and nicotinic acid
2.0g of sodium nicotinate (purchased from Taishiai (Shanghai) chemical industry development Co., Ltd.) is dissolved in 50mL of water to prepare a sodium nicotinate aqueous solution (A); dissolving 6.8g of lauroyl arginine ethyl ester hydrochloride in 40mL of water, heating to 90 ℃ until the lauroyl arginine ethyl ester hydrochloride is completely dissolved to prepare lauroyl arginine ethyl ester hydrochloride aqueous solution (B); slowly adding the sodium nicotinate aqueous solution (A) into the lauroyl arginine ethyl ester hydrochloride aqueous solution (B) at 90 ℃, continuously stirring, reacting for 2 hours, cooling to room temperature, filtering, fully washing the precipitate with purified water, and drying the precipitate at 60 ℃ in vacuum to obtain 7.6g of the nicotinic acid ion pair compound.
Example analysis of molecular formula and molecular weight of compound by dilauroyl arginine ethyl ester nicotinic acid ion pair
By mass spectrometry,1H-NMR、13The compound obtained by C-NMR spectroscopy has the formula:
1. mass Spectrometry (ESI) analysis
Cation B+The molecular ion peak has m/z 385.3, see fig. 1;
mass spectrometric detection of ESI+Is 124.2, see fig. 2. ESI-Is 122.2, i.e. the anion A-The molecular ion peak m/z is 122.2.
The theoretical calculation of the niacin ion for the cation in the compound was 507.4, and the observed value coincided with the theoretical value.
NMR analysis
Extracting lauroyl arginine ethyl ester hydrochloride (see FIG. 3), nicotinic acid1H-NMR (see FIG. 4) and of LAE Niacin ion-pair Compounds1H-NMR (see FIG. 5). In the process of salifying the LAE ion pair compound, the peak shape and chemical shift of lauroyl arginine ethyl ester in the ion pair compound are not changed greatly, but all hydrogen on nicotinic acid has shift change, and the spectral characteristics of the acid and base part are closer to the space distance compared with the original inorganic acid salt (namely LAE hydrochloride), so that the influence is generated, and the corresponding change is generated compared with the original LAE and the hydrochloride thereof, the superposition of the acid and base parts is not simple, for example, the solubility is changed when purified water is used for washing and precipitating, which shows that strong interaction is generated between all hydrogen nuclei of the lauroyl arginine ethyl ester and the nicotinic acid, and a stable single compound structure is formed through strong ionic bonds.
Example three: preparation method of ion pair compound synthesized by lauroyl arginine ethyl ester hydrochloride and tartaric acid
2.0g of tartaric acid (purchased from Chiese chemical industry Co., Ltd.) was dissolved in 50mL of methanol, and an equivalent amount of NaOH was added thereto, and the mixture was stirred at room temperature until a white solid was precipitated, and then the solution was filtered under suction and washed with 30mL of methanol three times to obtain a tartaric acid sodium salt. Dissolving sodium tartrate salt in 50mL of water to prepare a sodium tartrate salt aqueous solution (A); dissolving 5.6g of lauroyl arginine ethyl ester hydrochloride in 40mL of water, heating to 90 ℃ until the lauroyl arginine ethyl ester hydrochloride is completely dissolved to prepare lauroyl arginine ethyl ester hydrochloride aqueous solution (B); slowly adding the tartaric acid sodium salt aqueous solution (A) into the lauroyl arginine ethyl ester hydrochloride aqueous solution (B) at 90 ℃, continuously stirring, reacting for 2 hours, cooling to room temperature, filtering, fully washing the precipitate with purified water, and drying the precipitate in vacuum at 60 ℃ to obtain 6.3g of the tartaric acid ion pair compound.
Example analysis of molecular weight of Compounds by Artocylarginine Ethyl ester tartrate ions
Mass Spectrometry (ESI) analysis of cation B+Molecular ion peak m/z 385.3 (see fig. 1)
Anion A-Molecular ion peak m/z 149.0 (see FIG. 6)
The theoretical calculation of the niacin ion for the cation in the compound was 534.3, and the observed value coincided with the theoretical value.
Example five: preparation method for synthesizing ion pair compound by using lauroyl arginine ethyl ester hydrochloride and oxalic acid
Oxalic acid (purchased from research Co., Ltd.) 1.0g was dissolved in 50mL of methanol, and an equivalent amount of NaOH was added thereto, and the mixture was stirred at room temperature until a white solid precipitated, filtered under suction and washed with 30mL of methanol three times to obtain an oxalic acid sodium salt. Dissolving sodium oxalate in 50mL of water to prepare a sodium oxalate aqueous solution (A); dissolving 4.7g of lauroyl arginine ethyl ester hydrochloride in 40mL of water, heating to 90 ℃ until the lauroyl arginine ethyl ester hydrochloride is completely dissolved to prepare lauroyl arginine ethyl ester hydrochloride aqueous solution (B); slowly adding the sodium oxalate salt aqueous solution (A) into the lauroyl arginine ethyl ester hydrochloride aqueous solution (B) at 90 ℃, continuously stirring, reacting for 2 hours, cooling to room temperature, filtering, fully washing the precipitate with purified water, and drying the precipitate in vacuum at 60 ℃ to obtain 5.0g of the oxalate ion pair compound.
The results of NMR and ESI analyses performed according to the method of example two show that the ion pair compound is not a simple superposition of two acid and base portions, which are closely spaced and affect the spectral characteristics, and the spectral data of the ion pair compound is changed compared with the original LAE and its hydrochloride, for example, the solubility is changed when the precipitate is washed with purified water, which indicates that all hydrogen nuclei of lauroyl arginine ethyl ester have strong interactions with oxalic acid and form a stable single compound structure through strong ionic bonds.
Example six: preparation method of ion pair compound synthesized by lauroyl arginine ethyl ester hydrochloride and carbonic acid
1.0g of sodium carbonate (purchased from research Co., Ltd.) was dissolved in 50mL of water to prepare an aqueous sodium carbonate solution (A); dissolving 4.0g of lauroyl arginine ethyl ester hydrochloride in 40mL of water, heating to 90 ℃ until the lauroyl arginine ethyl ester hydrochloride is completely dissolved to prepare lauroyl arginine ethyl ester hydrochloride aqueous solution (B); slowly adding the sodium carbonate aqueous solution (A) into the lauroyl arginine ethyl ester hydrochloride aqueous solution (B) at 90 ℃, continuously stirring, reacting for 2 hours, cooling to room temperature, filtering, fully washing the precipitate with purified water, and drying the precipitate in vacuum at 60 ℃ to obtain 4.0g of the carbonate ion pair compound.
The results of NMR and ESI analyses performed according to the method of example two show that the ion pair compound does not have a simple superposition of two acid and base portions, the two acid and base portions are close in space distance and have an influence, and the spectral data of the ion pair compound is changed correspondingly compared with the original LAE and hydrochloride thereof, which indicates that all hydrogen nuclei of the lauroyl arginine ethyl ester have strong interaction with carbonic acid and form a stable single compound structure through strong ionic bonds.
Example seven: determination of lauroyl arginine ethyl ester ion pair compound Minimum Inhibitory Concentration (MIC) in vitro
The principle and the purpose are as follows: according to the microbubult dilution method specified by CLSI, the minimum drug concentration at which bacterial growth is inhibited after 24h of co-incubation of the drug with bacteria in a 96-well plate is the minimum inhibitory concentration of the drug.
The method comprises the following steps: lauroyl arginine ethyl ester hydrochloride (LAE hydrochloride) and the pair of lauroyl arginine ethyl ester organic acid ions prepared above are respectively diluted to different concentrations by Trypticase Soy Broth (TSB), the drug and the bacteria are mixed and incubated in a 96-well plate, and a blank control culture medium CK1 without bacteria, a culture medium CK2 added with LAE (1000. mu.g/ml) and a normal growth control culture medium CK3 without the drug are additionally arranged. The absorbance at 625nm of each well was measured after incubating the 96-well plate in a 37 ℃ incubator for 24 hours. OD with blank control625Wells with consistent values were considered to have no significant growth of bacteria. The lowest concentration of drug at which bacteria do not significantly grow is the minimum Inhibitory concentration mic (minimum inhibition concentration) of LAE to bacteria.
The results of comparing the antibacterial activity of various LAE derivatives (ion pair compounds) prepared with respect to the original LAE compound are shown in table 1 below.
TABLE 1 in vitro antibacterial Effect of LAE and its ion-pair Compounds on two bacteria
Comparison Escherichia coli Staphylococcus aureus
LAE 16(0.0016％) 8(0.0008％)
LAE nicotinic acid ion pair 16(0.0016％) 4(0.0004％)
LAE tartrate ion pair 16(0.0016％) 8(0.0008％)
LAE oxalate ion pair 8(0.0008％) 8(0.0008％)
LAE carbonate ion pair 16(0.0016％) 16(0.0016％)
Wherein the percentage value in the bracket () represents the mass percentage of each additive in the reaction system.
And (4) analyzing results:
(1) most of the ion pair compounds keep the same antibacterial activity to escherichia coli, and especially the antibacterial activity of the oxalic acid ion pair compounds is improved;
(2) most of the ion pair compounds keep the same antibacterial activity to staphylococcus aureus, the antibacterial activity of the carbonate ion pair compounds is reduced, and the antibacterial activity of the nicotinic acid ion pair compounds is obviously improved;
and (4) conclusion: ion pair compounds of LAE derivatives do not inhibit the antibacterial activity of the original LAE in a single component, but are beneficial to the antibacterial activity. Wherein, the nicotinic acid ion pair compound has obvious bacteriostatic effect on staphylococcus aureus.
Example eight: determination of inhibitory Activity of lauroyl arginine Ethyl ester ion on mildew-causing microorganisms
The principle and the purpose are as follows: the inhibition effect of lauroyl arginine ethyl ester (LAE) ions on the penicillium and aspergillus is detected by the inhibition zone method for the experiment, so that the mildew-proof effect of the lauroyl arginine ethyl ester ions on the penicillium and aspergillus is evaluated.
The method comprises the following steps: respectively putting penicillium or aspergillus spores into an LB liquid culture medium, selecting fungi single colonies, putting the fungi single colonies into a PDB liquid culture medium, culturing for 24 hours at room temperature, and uniformly coating the amplified bacterial liquid on the surface of the LB solid culture medium. The medium was punched with a 0.8mm punch, and lauroyl arginine ethyl ester ion pair or sodium methyl paraben, a positive fruit preservative, were added to the wells at various concentrations, approximately 100. mu.l per well, covered with a lid, and incubated in an incubator at 37 ℃ for 48 h. And measuring and counting the diameter of the inhibition zone of each hole.
The results are shown in tables 2 and 3.
TABLE 2 LAE and its ion pair Compounds results for the zone of inhibition of Penicillium
Figure BDA0002103355210000101
TABLE 3 LAE and its results for zone of inhibition of Aspergillus by ion-pair compounds
Figure BDA0002103355210000102
Figure BDA0002103355210000111
And (4) analyzing results: tables 2 and 3 show the inhibition zones of the LAE ion pair compounds for Penicillium and Aspergillus, respectively. Both LAE and LAE ion pair can inhibit the growth of Penicillium, LAE-formate ion pair, and LAE-salicylate ion pair have inhibitory effect at concentration of 256 μ g/ml or more, and LAE-nicotinic acid ion pair inhibits the growth of Microbacterium at concentration of 512 μ g/ml or more. Both LAE and LAE ion pair can inhibit the growth of Aspergillus, LAE-formate ion pair, LAE-salicylate ion pair have inhibitory effect at a concentration of 128 μ g/ml or more, and LAE-nicotinic acid ion pair inhibit the growth of Microbacterium at a concentration of 256 μ g/ml or more.
And (4) conclusion: the LAE can inhibit the growth of mildew-causing microorganisms, the ability of the LAE ion pair to inhibit the decay-causing microorganisms is not lost, and the inhibition effect of the LAE-nicotinic acid ion pair compound on penicillium and aspergillus is strongest.
Although the bacteriostatic effect of the 0.2% dose group was the highest among the above-mentioned several groups of experiments, and from the in vitro cell test data of the applicant's previously filed patent application (title of the invention: "use of lauroyl arginine ethyl ester derivative as antibacterial agent for animals", application No. 201810648982.3), the bacteriostatic effect was already produced at a concentration of 0.0032%, and the bacteriostatic effect was improved by increasing the dose of LAE and its derivative within a certain range, the bacteriostatic effect was not significantly improved relative to the 0.1% dose group, indicating that the dose range of 0.01% to 0.2% had satisfied the production requirement.
If the addition amount of the LAE and the derivatives thereof is increased, although the bacteriostatic rate is correspondingly increased, the excessively high bacteriostatic rate means more residues and is not beneficial to human health. Even so, because the bacteriostatic agent components of the LAE and the derivatives thereof belong to natural environment-friendly and nontoxic components, the bacteriostatic agent has the advantage of being friendly to human bodies when being added and used in high dosage compared with the traditional chemical bacteriostatic agent.
Therefore, in consideration of production cost and actual production requirements, the LAE and the ion pair thereof can effectively prevent and treat diseases when the mass percentage concentration of the LAE and the ion pair thereof as the leather mildew-proof nursing agent is 0.001-0.01% or 0.01-0.1% or 0.1-0.2%, preferably the effective concentration is 0.05-0.1%, and most preferably 0.1-0.2%, and meet the production requirements.

Claims (7)

  1. Use of a LAE ion pair compound for the preparation of a leather fungicide or a mildew-proof care agent, characterized in that the LAE ion pair compound has the following formula (III):
    Figure FDA0002981511870000011
    wherein the organic acid salt of RCOO-is selected from salicylate, ammonium formate, calcium formate, nicotinate, oxalate with antibacterial activity; and
    wherein the LAE ion pair compound is prepared by the condensation reaction of:
    (1) heating and dissolving the compound shown in the formula (II), and then adding an organic acid salt solution of RCOO-;
    Figure FDA0002981511870000012
    (2) fully stirring and uniformly mixing, and carrying out condensation reaction under the condition of heating to 90 ℃ to obtain the LAE ion pair compound, wherein the condensation reaction is shown as the following reaction formula:
    Figure FDA0002981511870000013
    (3) after sufficient reaction, the reaction mixture is cooled to room temperature, washed and purified with purified water and then dried in vacuum, thereby preparing a purified LAE ion pair compound.
  2. 2. The use according to claim 1, wherein the LAE ion pair compound is present in the leather mildewcide or mildewproof conditioner in a concentration of 0.01 to 2% by mass.
  3. 3. The use according to claim 2, wherein the LAE ion pair compound is present in the leather mildewcide or mildewproof conditioner in a concentration of 0.001 to 0.01%, 0.01 to 0.1%, 0.05 to 0.1%, 0.1 to 0.2%, 0.1 to 1%, 1 to 2%, or 1.5 to 2% by mass.
  4. 4. Use according to any one of claims 1 to 3, wherein the organic acid salt of RCOO-is selected from nicotinates, oxalates.
  5. 5. A preparation method of a leather mildew preventive or mildew preventive care agent is characterized by comprising the following steps:
    (1) heating and dissolving the compound shown in the formula (II), and then adding an organic acid salt solution of RCOO-;
    Figure FDA0002981511870000021
    (2) fully stirring and uniformly mixing, and heating to 90 ℃ to obtain the LAE ion pair compound through the following condensation reaction, wherein the condensation reaction is shown as the following reaction formula:
    Figure FDA0002981511870000022
    wherein the RCOO-organic acid salt is selected from salicylate, ammonium formate, calcium formate, nicotinate, and oxalate with antibacterial activity;
    (3) after full reaction, cooling to room temperature, washing with purified water, purifying, and vacuum drying to prepare a purified LAE ion pair compound;
    (4) and adding the matrix solution into a container at normal temperature and normal pressure, adding the LAE ion pair compound, and circularly and fully stirring by a pump to obtain the leather mildew preventive or mildew preventive care agent.
  6. 6. The method of claim 5, wherein the organic acid salt of RCOO-is prepared by the following method: adding the organic acid into a methanol solution, adding a proper amount of NaOH, stirring at room temperature until a white solid is separated out, carrying out suction filtration, and washing with methanol to obtain the organic acid salt.
  7. 7. A leather mildewcide or mildewproof type conditioner prepared by the method as set forth in claim 5 or 6.
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CN101227884A (en) * 2005-08-01 2008-07-23 米雷特实验室股份公司 Corrosion protection system including cationic surfactant
CN101500552A (en) * 2006-08-03 2009-08-05 米雷特实验室股份公司 Antiviral use of cationic surfactant
CN106565546A (en) * 2016-10-21 2017-04-19 武汉桀升生物科技有限公司 Lauroyl arginine ethyl ester glycol acid salt and preparation method and application thereof

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US20090318557A1 (en) * 2003-12-22 2009-12-24 Stockel Richard F Dermatological compositions

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101227884A (en) * 2005-08-01 2008-07-23 米雷特实验室股份公司 Corrosion protection system including cationic surfactant
CN101500552A (en) * 2006-08-03 2009-08-05 米雷特实验室股份公司 Antiviral use of cationic surfactant
CN106565546A (en) * 2016-10-21 2017-04-19 武汉桀升生物科技有限公司 Lauroyl arginine ethyl ester glycol acid salt and preparation method and application thereof

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