CN113786382A - Terbinafine hydrochloride gel and preparation method thereof - Google Patents
Terbinafine hydrochloride gel and preparation method thereof Download PDFInfo
- Publication number
- CN113786382A CN113786382A CN202111298496.1A CN202111298496A CN113786382A CN 113786382 A CN113786382 A CN 113786382A CN 202111298496 A CN202111298496 A CN 202111298496A CN 113786382 A CN113786382 A CN 113786382A
- Authority
- CN
- China
- Prior art keywords
- gel
- terbinafine hydrochloride
- microemulsion
- gellan gum
- aqueous solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Abstract
The invention belongs to the field of medicinal preparations, and particularly relates to terbinafine hydrochloride gel with biocompatibility, no toxicity and no irritation and a preparation method thereof. It is prepared by mixing microemulsion loading terbinafine hydrochloride with gellan gum aqueous solution, stirring uniformly, and cooling to room temperature. The microemulsion is prepared from tween 20, sunflower seed oil, 1, 2-propylene glycol, disodium hydrogen phosphate and water, and the preparation process is simple. The gel shows the characteristics of fluid gel, such as shear thinning non-Newtonian fluid characteristics, and further has better stability and coating property, and is suitable for large-scale production.
Description
Technical Field
The invention relates to a novel preparation of an external medicament and a preparation method thereof, in particular to terbinafine hydrochloride gel which adopts a biocompatible, nontoxic and non-irritant matrix and a preparation method thereof.
Background
Terbinafine hydrochloride, its chemical name is (E) -N- (6, 6-dimethyl-2-heptene-4-alkynyl) -N-methyl-1-formamide naphthalene. Is an allylamine medicine with broad-spectrum antifungal activity artificially synthesized by Nowa company. Can specifically interfere early biosynthesis of mycosterol, inhibit ergosqualene epoxidase of fungi with high selectivity, and inhibit ergosqualene epoxidation reaction during formation of fungal cell membrane, thereby achieving the effect of killing or inhibiting fungi. It is highly hydrophobic and therefore tends to accumulate in hair, skin, nails and adipose tissue, and is used to treat dermatophyte infections and other fungal skin infections. The structural formula is as follows:
terbinafine hydrochloride is an ionic drug, has low solubility in water of only 8.8mg/ml, LogP of 3.84 and molecular weight of 327.89, and is suitable for being developed into a transdermal administration preparation. The transdermal drug delivery preparation directly acts on the affected part without passing through the digestive tract and the liver, so that the whole body exposure of the drug is greatly reduced, and the occurrence of toxic and side effects is reduced. The currently clinically common terbinafine hydrochloride skin external preparations comprise cream, spray and gel. Compared with the gel, when the cream meets acidic, alkaline or high ionic strength, the cream is often unstable and even breaks emulsion, and the moisture is easy to lose and the phenomenon of breaking emulsion and layering is easy to occur in the long-term storage process. The spray has low drug concentration, short residence time at the focus, and easy abrasion by socks, clothes, trousers, etc., and needs repeated administration to achieve ideal effect.
The terbinafine hydrochloride gel former preparation isUnder the trade name LAMISIL, developed by Kurarin SchkATThe gel matrix is carbomer, each gram of gel contains 0.01g of terbinafine, benzyl alcohol and ethanol contained in auxiliary materials can possibly cause local skin reaction, and a pH regulator sodium hydroxide contained in the gel can also generate certain stimulation to the skin.
Patent CN111557903A discloses a method for preparing terbinafine hydrochloride gel, which comprises using carbomer (type B) as gel matrix, mixing the drug with propylene glycol and polyethylene glycol 400, mixing with carbomer swelling aqueous solution containing edetate disodium, adding polysorbate 80 and ethanol, stirring and emulsifying, and finally adding triethanolamine to adjust pH value, thereby obtaining terbinafine hydrochloride gel. The gel prepared by the invention has various solubilizers and emulsifiers, and is expected to improve the transdermal penetration of the medicine.
Patent CN105342986A discloses a terbinafine hydrochloride gel and its preparation method, which comprises swelling carbomer with edetate disodium water solution until no hard core is present, and mixing the swelled carbomer with propylene glycol, polyethylene glycol 400, cetyl alcohol, and tert-butyl p-hydroxyanisole to form gel matrix. Mixing the gel matrix with terbinafine hydrochloride ethanol solution and polysorbate 80, emulsifying, adding triethanolamine water solution, and stirring for 60-120min to obtain gel preparation with fine colloid, uniform content, and easy application and removal. However, the method requires 24 hours for swelling carbomer, so that the batch-to-batch period is long, and the workshop production is not facilitated.
Patent CN102397240A discloses terbinafine hydrochloride gel, and the auxiliary materials include carbomer, benzoic acid, propylene glycol, triethanolamine, polysorbate-80, disodium edetate, 75% ethanol, and distilled water. And (3) mixing and stirring different components in multiple steps at different temperatures to obtain the gel finished product. The prepared finished product has good quality and is suitable for batch production. However, the preparation process is complicated, and the mixing sequence is easy to make mistakes. Carbomer gels are sensitive to acidic substances and benzoic acid in the composition may cause a decrease in gel adhesion.
The prior gel preparation technologies disclosed above are all traditional hydrochloric acid specific gel formulas and preparation methods, and although certain beneficial effects are obtained, some defects still exist: the proportion of ethanol in the preparation is too high, and is above 20%, and certain stimulation is inevitably brought to the focus. Ethanol is highly volatile, which causes deterioration of the moisturizing effect of the gel after application, affecting the therapeutic effect. The gel matrix is carbomer which is sensitive to mineral ions, the focus is accidentally wetted, and calcium, magnesium and other ions in water can reduce the gel consistency and easily cause falling off. Most of the additives used in the prescription are derived from petroleum refining products, which inevitably cause certain irritation to the skin on one hand and certain damage to the environment on the other hand.
To ameliorate the above disadvantages, the inventors have conceived a gel matrix of microbial origin, gellan gum, in combination with a microemulsion of solubilized drug, for the preparation of terbinafine hydrochloride gel formulations.
Gellan gum is a microbial polysaccharide that is an anionic linear polysaccharide produced by the culture and fermentation of pseudomonas elodea. The polymer chain of gellan gum consists of tetrasaccharide repeat units of D-glucose, D-glucal, D-glucose and L-rhamnose, and has a relative molecular mass of about 500 k. The formed gel has good stability, can not only resist the environments of high temperature, acid and the like, but also resist the degradation of enzyme and microorganism, and has the advantages of safety, no toxicity, high gel transparency, good biocompatibility and the like. The native form of gellan gum (high acyl gellan gum) contains two types of acyl substituents, L-glyceryl and acetyl. Removal of these two substituents by alkaline hydrolysis can result in deacetylated gellan gum, also known as low acetyl or low acyl gellan gum.
The acyl group in the high acyl gellan gum can generate a blocking effect when molecules are aggregated into the gum, so that the formed gel is soft, rich in elasticity and strong in adhesive force. Low acyl gellan gums form strong, brittle gels. In practical application, a small amount of cations are added in the cooling process to prepare the gellan gum gel with a stable structure, so that the electrostatic repulsion effect between carboxyl side chains of the gellan gum is shielded, the aggregation quantity of double helix of the gellan gum solution in the cooling process is increased, and further the gel is formed.
Tween 20 is selected as the emulsifier in the microemulsion, and the emulsifier is relatively mild and has low skin irritation although the emulsifying capacity is weak. The oil phase is sunflower seed oil which is a high-grade nutritional oil, golden in color, clear and transparent, and has aromatic smell. And contains a large amount of linoleic acid and other unsaturated fatty acids necessary for human body, and can promote regeneration and growth of human body cells, protect skin health, and reduce cholesterol deposition in blood. The sunflower seed oil also contains various substances beneficial to human beings such as sterol, vitamin, phytosterol, phospholipid, carotene and the like, wherein the content of natural vitamin E is the highest in all main vegetable oils, and the sunflower seed oil has good antioxidant capacity.
Disclosure of Invention
In view of the defects of the prior art, the inventor provides the terbinafine hydrochloride gel, and the gellan gum aqueous solution and the drug-loaded microemulsion are combined, so that the solubilization capacity of the gellan gum is improved, the advantages of the gel are exerted, the drug can be favorably adhered to a focus, the excellent skin permeability of the drug is ensured, and the curative effect is further improved.
The microemulsion phase region at room temperature is found by a method of a quasi-ternary phase diagram by taking Tween 20 as an emulsifier, 1.2 propylene glycol of an auxiliary emulsion and sunflower seed oil as oil phases and disodium hydrogen phosphate aqueous solution as a water phase. According to the proportion of the components in the phase region, the terbinafine hydrochloride is dispersed in the oil phase and the Tween 20, and then the water phase is added for uniform mixing, thus obtaining the terbinafine hydrochloride microemulsion. And mixing the gellan gum aqueous solution with the drug-loaded microemulsion to obtain the terbinafine hydrochloride gel. The preparation method is simple, and the obtained gel preparation is fine and smooth, and has good spreadability and stability and high safety.
The invention is realized by the following scheme:
a terbinafine hydrochloride gel, which is a composition of a microemulsion carrying terbinafine hydrochloride and a gel matrix aqueous solution.
The microemulsion in the gel consists of Tween 20, an oil phase and a water phase.
The gel matrix aqueous solution in the gel is an aqueous solution of gellan gum.
Preferably, the gellan gum in the gel is selected from natural gellan gums, i.e. high acyl gellan gums.
The concentration of the gellan gum aqueous solution in the gel is 0.4-1.5 wt%.
Preferably, the concentration of the gellan gum aqueous solution in the gel is 0.6 to 1.3 wt%.
The oil phase of the microemulsion in the gel is a mixture of sunflower seed oil and 1.2-propylene glycol, wherein the mixing mass ratio of the sunflower seed oil to the 1.2-propylene glycol is 7: 3.
The water phase of the microemulsion in the gel is a disodium hydrogen phosphate aqueous solution, wherein the concentration of the disodium hydrogen phosphate aqueous solution is 1.0-1.6 wt%.
The microemulsion of terbinafine hydrochloride in the gel is 2 parts, tween 20 is 20-70 parts, oil phase is 5-20 parts, and water phase is 20-80 parts.
Preferably, the microemulsion of terbinafine hydrochloride in the gel is 2 parts, tween 20 is 20-60 parts, oil phase is 5-15 parts, and water phase is 30-80 parts.
The mass ratio of the terbinafine hydrochloride-loaded microemulsion to the gellan gum aqueous solution in the gel is 1: 1.
The invention also provides a preparation method of terbinafine hydrochloride gel, which comprises the following steps:
(1) dissolving or suspending terbinafine hydrochloride in the mixed solution of oil phase and Tween 20, adding water phase, mixing, and balancing at room temperature for 1 hr to obtain terbinafine hydrochloride microemulsion.
(2) Dissolving a proper amount of gellan gum powder in hot water at the temperature of 80 ℃, cooling to below 50 ℃, mixing with the prepared terbinafine hydrochloride microemulsion according to the mass ratio of 1:1, and cooling to room temperature to obtain the stable terbinafine hydrochloride gel preparation.
Compared with the prior art, the invention has the following advantages:
(1) the gel has proper viscoelasticity and good stability. The shear dilution characteristic is convenient for the affected part to be coated; the gel matrix has increased strength when meeting calcium, magnesium and other cations, so that the risk of gel water-soaking and falling off at the focus can be reduced, and the compliance of patients is improved.
(2) The preparation has the advantages of reduced components, simple preparation process, and high controllability of related substances. Disodium hydrogen phosphate is a pH regulator and a gel enhancer. The solubilization of the microemulsion can increase the concentration gradient between the drug and the skin and promote the transdermal absorption of the drug; 1.2 propylene glycol and sunflower oil (containing linoleic acid) can also be used as skin penetration enhancer. Meanwhile, the sunflower seed oil has excellent oxidation resistance and can be used as an antioxidant.
(3) The preparation has no toxicity, no irritation, and good skin compatibility.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a graph of the shear viscosity of terbinafine hydrochloride gel as a function of shear rate;
figure 2 is a graph of the change of the storage modulus and loss modulus of terbinafine hydrochloride gel with frequency.
Detailed Description
The advantages of the present invention are further described below by way of examples, it being properly understood that: the examples of the present invention are given for illustrative purposes only and are not intended to limit the present invention. Therefore, simple modifications of the present invention in the process of the present invention are within the scope of the claimed invention.
Determination of the phase region of microemulsions
Firstly, uniformly mixing 7 parts of sunflower seed oil and 3 parts of 1, 2-propylene glycol to obtain an oil phase, dissolving a proper amount of disodium hydrogen phosphate in water to obtain a water phase, accurately weighing Tween 20 and the oil phase in different transparent glass test tubes according to the mass ratio of Tween 20 to the oil phase (10:0 → 0:10), uniformly stirring in a constant-temperature water bath at 25 ℃, dropwise adding the water phase into the test tubes again, uniformly mixing, and balancing for 1-2 hours. And judging the phase state according to the characteristics of mixture fluidity, transparency and the like, and taking a transparent flowing water-like single-phase area as a micro-emulsion area.
Preparation of terbinafine hydrochloride gel
The purified water added in the following examples is divided into two parts, purified water a representing the first part and purified water b representing the second part.
Example 1
1) Prescription
2) Preparation process
(a) Uniformly dispersing a prescription amount of terbinafine hydrochloride in a mixture of tween 20, sunflower seed oil and 1, 2-propylene glycol;
(b) adding purified water a containing disodium hydrogen phosphate into the mixture in the step (a) while stirring, uniformly mixing, and standing for 1h to reach phase balance to obtain a drug-loaded microemulsion;
(c) uniformly dispersing the gellan gum in the prescription amount in hot water (purified water b) at 80 ℃, stirring for dissolving, and cooling to below 50 ℃;
(d) and transferring the drug-loaded microemulsion into the gellan gum aqueous solution, stirring uniformly, and cooling to room temperature to obtain the terbinafine hydrochloride gel.
Example 2
1) Prescription
2) Preparation process
(a) Uniformly dispersing a prescription amount of terbinafine hydrochloride in a mixture of tween 20, sunflower seed oil and 1, 2-propylene glycol;
(b) adding purified water a containing disodium hydrogen phosphate into the mixture in the step (a) while stirring, uniformly mixing, and standing for 1h to reach phase balance to obtain a drug-loaded microemulsion;
(c) uniformly dispersing the gellan gum in the prescription amount in hot water (purified water b) at 80 ℃, stirring for dissolving, and cooling to below 50 ℃;
(d) and transferring the drug-loaded microemulsion into the gellan gum aqueous solution, stirring uniformly, and cooling to room temperature to obtain the terbinafine hydrochloride gel.
Example 3
1) Prescription
2) Preparation process
(a) Uniformly dispersing a prescription amount of terbinafine hydrochloride in a mixture of tween 20, sunflower seed oil and 1, 2-propylene glycol;
(b) adding purified water a containing disodium hydrogen phosphate into the mixture in the step (a) while stirring, uniformly mixing, and standing for 1h to reach phase balance to obtain a drug-loaded microemulsion;
(c) uniformly dispersing the gellan gum in the prescription amount in hot water (purified water b) at 80 ℃, stirring for dissolving, and cooling to below 50 ℃;
(d) and transferring the drug-loaded microemulsion into the gellan gum aqueous solution, stirring uniformly, and cooling to room temperature to obtain the terbinafine hydrochloride gel.
Example 4
1) Prescription
2) Preparation process
(a) Uniformly dispersing a prescription amount of terbinafine hydrochloride in a mixture of tween 20, sunflower seed oil and 1, 2-propylene glycol;
(b) adding purified water a containing disodium hydrogen phosphate into the mixture in the step (a) while stirring, uniformly mixing, and standing for 1h to reach phase balance to obtain a drug-loaded microemulsion;
(c) uniformly dispersing the gellan gum in the prescription amount in hot water (purified water b) at 80 ℃, stirring for dissolving, and cooling to below 50 ℃;
(d) and transferring the drug-loaded microemulsion into the gellan gum aqueous solution, stirring uniformly, and cooling to room temperature to obtain the terbinafine hydrochloride gel.
Example 5
1) Prescription
2) Preparation process
(a) Uniformly dispersing a prescription amount of terbinafine hydrochloride in a mixture of tween 20, sunflower seed oil and 1, 2-propylene glycol;
(b) adding purified water a containing disodium hydrogen phosphate into the mixture in the step (a) while stirring, uniformly mixing, and standing for 1h to reach phase balance to obtain a drug-loaded microemulsion;
(c) uniformly dispersing the gellan gum in the prescription amount in hot water (purified water b) at 80 ℃, stirring for dissolving, and cooling to below 50 ℃;
(d) and transferring the drug-loaded microemulsion into the gellan gum aqueous solution, stirring uniformly, and cooling to room temperature to obtain the terbinafine hydrochloride gel.
Verification examples
1. Stability test
In order to verify the stability of the terbinafine hydrochloride gel in the invention in the extraordinary environment, the terbinafine hydrochloride gel of examples 1-5 was subjected to a centrifugal (3000r/min, 5min), heat-resistant (55 ℃, 6h), cold-resistant (-15 ℃, 24h) stability test, and the appearance and coating properties were observed.
As a result: after the terbinafine hydrochloride gel is centrifuged, no layering phenomenon occurs in the examples 1-5, and the gel is still uniform and fine, is easy to coat and has good transparency.
After cold resistance and heat resistance experiments, no layering phenomenon, no liquefaction and coarsening phenomenon, and uniform and fine gel which is easy to coat and has light transparency are observed in the terbinafine hydrochloride gel in the examples 1 to 5.
2. Long term stability test
To further prove the superiority of the invention, the inventor stores the product obtained in the embodiment of the invention at 25 ℃ +/-2 ℃ and 60% +/-5% RH for 12 months, and respectively measures the content (calculated by terbinafine hydrochloride) of the retained sample at 0 month, 3 months, 6 months and 12 months according to the measuring method under the term of terbinafine hydrochloride gel content measurement of second pharmacopoeia of China edition 2000. Specific data are shown in table 1.
The inventor stores the product obtained in the embodiment of the invention at 25 ℃ +/-2 ℃ and 60% +/-5% RH for 12 months, and measures the related substances of the reserved sample at 0 month, 3 months, 6 months, 9 months and 12 months respectively according to the measuring method under the related substance item of terbinafine hydrochloride in the second part of the 2020 edition Chinese pharmacopoeia, and the specific data are shown in Table 2.
TABLE 1. long term stability test results for terbinafine hydrochloride gel
TABLE 2. results of long-term stability test of terbinafine hydrochloride gel
3. Repeated administration skin irritation test
42 Japanese white rabbits qualified for quarantine are completely randomly divided into 2 groups according to sex and weight, each group comprises 21 rabbits, and the male rabbit and the female rabbit are respectively used for irritation tests of intact skin and broken skin. The left side and the right side of the experimental animal are coated with the test object by adopting a homomorphic left-right self-contrast method, and the right side is coated with the test object excipient (the auxiliary material of the terbinafine hydrochloride gel of the invention) as a contrast. Then, the 21 Japanese white rabbits of the intact skin group and the damaged skin group are randomly divided into 7 groups according to the weight and sex, and the groups are respectively as follows: example 1 group, example 2 group, example 3 group, example 4 group, example 5 group, substrate control group, and commercial group (LAMISIL)AT) 3 drugs are administered to each group, and the administration is carried out once a day for 4 hoursIn time, the administration was continued for 14 days. Visual observation of the administration site 1 hour after each drug removal and before re-administration was carried out, and the irritation response and the occurrence and regression times were recorded, and the irritation response at the application site was visually observed and recorded 30-60min, 24, 48 and 72 hours after the last drug administration was removed. The scoring criteria are shown in tables 2 and 3.
TABLE 2 skin irritation response score criteria
TABLE 3 skin irritation Strength Scoring criteria
As a result: during the administration period of the animals with intact skin and after the administration, no obvious irritation such as erythema, red swelling and the like can be observed by visual observation on the local appearance of the administered animals. The average skin irritation response score for each group was 0.
For the damaged skin group animals, mild erythema phenomenon can be seen in 1-3 days in the initial period of administration, and no obvious difference exists among the groups. In the middle of the administration, erythema gradually disappeared, and the average time of skin healing was more than that of the commercial group (LAMISIL) in examples 1 to 5AT) 1.5 days faster, the degree of healing was substantially consistent. After healing, no obvious irritation reaction is seen on the skin, and no obvious abnormality is seen on the skin in the observation period.
Claims (10)
1. The terbinafine hydrochloride gel is characterized in that the gel is a composition of a microemulsion carrying terbinafine hydrochloride and a gel matrix aqueous solution.
2. Terbinafine hydrochloride gel according to claim 1, wherein the microemulsion in said gel consists of tween 20, an oil phase and an aqueous phase.
3. Terbinafine hydrochloride gel according to claim 1, wherein said aqueous solution of the gel matrix in the gel is an aqueous solution of gellan gum, and wherein the gellan gum in the gel is selected from the group consisting of natural gellan gum, i.e. high acyl gellan gum.
4. Terbinafine hydrochloride gel according to claim 3, wherein the concentration of the aqueous gellan gum solution in said gel is 0.4-1.5 wt%.
5. Terbinafine hydrochloride gel according to claim 4, wherein the concentration of the aqueous gellan gum solution in said gel is 0.6-1.3 wt%.
6. The terbinafine hydrochloride gel of claim 2, wherein the oil phase of the microemulsion in the gel is a mixture of sunflower seed oil and 1.2-propylene glycol, and the mixing mass ratio of the sunflower seed oil to the 1.2-propylene glycol is 7: 3.
7. Terbinafine hydrochloride gel according to claim 2, wherein the aqueous phase of the microemulsion in said gel is an aqueous solution of disodium hydrogen phosphate, wherein the concentration of the aqueous solution of disodium hydrogen phosphate is 1.0-1.6 wt%.
8. The terbinafine hydrochloride gel of claim 1, wherein the microemulsion of terbinafine hydrochloride in the gel is 2 parts, tween 20 is 20-70 parts, oil phase is 5-20 parts, and water phase is 20-80 parts.
9. The terbinafine hydrochloride gel of claim 1, wherein the mass ratio of the terbinafine hydrochloride loaded microemulsion to the gellan gum aqueous solution in the gel is 1: 1.
10. A process for the preparation of terbinafine hydrochloride gel as claimed in any of claims 1 to 9, said process comprising the steps of:
(1) dissolving or suspending terbinafine hydrochloride in the mixed solution of oil phase and Tween 20, adding water phase, mixing, and balancing at room temperature for 1 hr to obtain terbinafine hydrochloride microemulsion.
(2) Dissolving a proper amount of gellan gum powder in hot water at the temperature of 80 ℃, cooling to below 50 ℃, and mixing with the prepared terbinafine hydrochloride microemulsion according to the mass ratio of 1:1 to obtain the terbinafine hydrochloride gel.
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