FIELD OF THE INVENTION

The present invention provides topical compositions comprising an antifungal agent, an oil and excipients or additives, for the treatment of fungal infections. The present invention further provides compositions devoid of more than C-10 fatty acids or their esters for the treatment of topical fungal infections. The present invention further provides antifungal compositions comprising an antifungal agent, a fatty acid or its ester with less than Cl l chain length and excipients or additives.

BACKGROUND OF THE INVENTION

Fungal infections of the skin are also known as 'mycoses'. They are common and generally mild. In sick or otherwise immune-suppressed individuals, however, fungi can sometimes cause serious disease. Fungal infections in humans range from superficial, i.e., skin surface to deeply invasive type or disseminated infection.

In general, superficial fungal infections (also known as cutaneous mycosis) can affect the outer layers of skin, nails and hair. The main groups of fungi causing superficial fungal infections are dermatophytes (tinea), yeasts, e.g., Candida, malassezia, piedra, etc. and moulds. These infections include dandruff/seborrheic dermatitis (D/SD), ringworm, onychomysis, intertrigo, and those in psoriasis amongst others.

Seborrheic dermatitis is a common, chronic, superficial skin disorder causing scaly, itchy, red skin on the scalp, eyebrows, nasolabial creases, lips, ears, sternal area, axillae, submammary folds, umbilicus, groins, and gluteul crease. The disease is characterized by many shapes, sizes, and surface textures and is often crust-like, yellowish, and accompanied by itching. Seborrheic dermatitis is one of the leading causes of stubborn dandruff and occurs in all age groups. This condition primarily affects the sebaceous cysts present in the skin.

Currently, fungi of the genus Malassezia are believed to be the most likely responsible agents for causing dandruff (Dawson T.L., J. Investig. Dermatol. Symp. Proc. (2007), 12: 1519). Most cases of seborrhoeic dermatitis likely involve an inflammatory reaction to the proliferation of the yeast Malassezia. These fungi are highly dependent on external lipids for in vitro growth (Chen T.A. and Hill P.V., Vet Dermatol, (2005), 16:4). Further, the inability to synthesize fatty acids may be complimented by the presence of multiple secreted lipases to aid in utilizing host lipids. Consequently, these fungi metabolize triglycerides present in sebum through these lipases resulting in lipid by-products. Penetration of the top layer of the epidermis, the stratum corneum, by these lipid by-products results in an inflammatory response in susceptible persons, which disturbs homeostasis causing erratic cleavage of stratum corneum cells, further leading to dandruff and seborrheic dermatitis.

The most common treatment of fungal infections is the topical application of antifungal agents that reduce the level of Malassezia on the scalp. Maintaining the scalp clean is mandatory for sufferers of seborrheic dermatitis. Use of effective anti-dandruff shampoos is, therefore, a significant way of preventing this condition.

Typically, the antifungal agent is applied to the scalp as a component of a shampoo or other hair care composition. The disadvantage of such shampoo formulations is that during normal usage the formulation does not remain on the scalp for a period of time sufficient to allow the antifungal agent to achieve its maximal therapeutic effect (Ralph M. Triieb, JDDG, (2007), 5:356). These are designed to be applied, for example, in the shower or bath, and shortly thereafter rinsed off with water. Typically, the application instructions for such shampoos suggest that the formulation be removed after 3-5 minutes.

One of the antifungal agents, ketoconazole is among the most potent and widely used in anti- dandruff shampoos. However, the exposure time of shampoo is less, due to which the efficacy is poor and relapse rates are higher.

In the past we found that, fatty acids and their derivatives (e.g. methylated and hydroxyl fatty acids) are known to possess antibacterial and antifungal activity as they target the cell membrane leading to increase in membrane fluidity (Douglas and Marshalland, "Antimicrobials in Food", 3 ^rd edition, CRC Press 2005 Pg. no. 327 - 360).

In context to another review, the pelargonic and capric acid on Microsporum gypseum were found to be effective when tested in-vitro cell culture (Chandeganipour and Haims, "Mycoses", 2001, Volume 44, Issue 3-4, pages 109-1 12). Similar reports were found with reference to Candida albicans when exposed to monoesters of glycerides of capric (CIO saturated medium chain fatty acid) (Bergsson et ah, Antimicrobial agents and Chemotherapy, 2001, Vol 45 pg. no. 3209 - 3212).

U.S. Patent Application 2010/0016271 discloses hair conditioning compositions comprising cationic surfactant, triglyceride oil and an anti-dandruff agent. These compositions contain triglyceride oil, which are fatty acid esters of glycerol, and hence act as nutrients and aid in the growth of the fungus. These compositions contain fatty material up to 10% having carbon chains from 8 to 30 carbon atoms.

U.S. Patent No. 5,624,666 describes shampoo compositions containing anionic surfactants, cationic polymers, and zinc pyridinethione as an anti-dandruff agent. It describes that conditioning agents such as silicone fluids can optionally be incorporated into the compositions therein. Head & Shoulders ^® Dandruff Shampoo Plus Conditioner is an example of a marketed product which provides both anti-dandruff and conditioning benefits upon application of the shampoo to hair. The exposure time of shampoos is less than required for effective antifungal activity, hence relapse rates are higher.

U.S. Patent No. 7547752 refers to synergistic combination of an anti-dandruff agent with conjugated linoleic acid for prevention or treatment of dandruff and scalp itching.

European Patent No. 1923043 Al discloses cationic conditioning agents and an anti-dandruff agent with surfactants, silloxanes and natural and lipophillic oily components and their derivatives for the treatment or prevention of dandruff with conditioning.

European Patent No 0116439 discloses fatty acids like petroselinic and linoleic and saturated and unsaturated derivatives which alleviate dandruff and stimulate hair growth.

Commercially available formulations for the treatment of dandruff are leave-on hair formulations such as hair oils, styling gels, etc. These formulations also contain anti-dandruff or antifungal agents. Conventional leave-on formulations, especially oils or creams, contain fatty acid or their esters as an essential ingredient. These fatty acid and esters aid the growth of dandruff-causing fungus (Malassezia furfur) and work as nutrients. Accordingly, there remains a need for an antifungal composition that provides improved cleansing and optimal anti-dandruff efficacy. The present invention addresses this need by providing topical compositions having antifungal agents and is devoid of fungus nutrients.

OBJECTIVE OF THE INVENTION

The primary objective of the invention is to provide antifungal compositions comprising an antifungal agent, an oil and excipients or additives, for the treatment of fungal infections

Yet another objective of the invention is to provide antifungal compositions devoid of more than C-10 fatty acids or their esters for the treatment of topical fungal infections.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a photograph showing the effect of nutrients provided in the culture media on the growth of M.Furfiir

Figure 2 is a photograph showing the effect of 2% caprylic acid (C8) (A), 2% Capric acid (CIO), (B) and 2% monocaprylate of propylene glycol (C). Olive oil (D) and no oil supplement (E) were used as controls.

Figure 3 is a photograph showing the growth of M. furfur depending on the nutrients provided in the culture media.

BRIEF DESCRIPTION OF THE TABLES

Table 1 : Piroctone olamine - oil compositions

Table 2: Ketoconazole - oil compositions

Table 3 : Results of MIC for oil compositions of piroctone olamine

Table 4: Results of MIC for oil compositions of ketoconazole

Table 5 : Oil compositions containing piroctone olamine as antifungal agent

Table 6: MIC of oil compositions containing piroctone olamine against M. furfur

Table 7: MIC for oil compositions containing piroctone olamine against M. obtuse

Table 8: Oil compositions containing ketoconazole as antifungal agent

Table 9: Oil compositions containing piroctone olamine and ketoconazole in combination Table 10: Oil compositions containing piroctone olamine as antifungal agent and Minoxidil

Table 1 1 : Gel compositions containing antifungal agents devoid of C- 1 1 or greater fatty acids/esters Table 12: Zone of inhibition of gel compositions containing piroctone olamine against M. furfur Table 13: Preparation of cream compositions containing antifungal agents Piroctone olamine or ketoconazole.

SUMMARY OF THE INVENTION

The present invention provides antifungal compositions that are devoid of C- 1 1 or greater fatty acids and their esters as these fatty acids/esters serve as nutrients for the growth of the fungus. The present invention further provides topical antifungal oil compositions that eliminate existing dandruff on the scalp, or prevent or reduce relapse of dandruff formation. The present invention further provides antifungal compositions comprising an antifungal agent, a fatty acid or its ester with less than C-l 1 chain length, and excipients or additives.

DETAILED DESCRIPTION OF THE INVENTION

While the invention is susceptible to various modifications and alternative forms, specific aspect thereof has been shown by way of example and drawings and will be described in detail below. It should be understood, however that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the invention as defined by the appended claims.

The Applicants would like to mention that the examples are mentioned to show only those specific details that are pertinent to understanding the aspects of the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

In the following detailed description of the aspects of the invention, reference is made to the accompanying drawings and graphs that form part hereof and in which are shown by way of illustration specific aspects in which the invention may be practiced. The aspects are described in sufficient details to enable those skilled in the art to practice the invention, and it is to be understood that other aspects may be utilized and that charges may be made without departing from the scope of the present invention. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims. Accordingly the present invention is directed to compositions for the treatment of fungal infections, comprising:

(A) at least one antifungal agent;

(B) at least one oil and;

(C) at least one excipient

where said composition being devoid of C-l 1 fatty acids and their esters.

Another aspect of the present invention is to provide an anti dandruff oil composition comprising:

(A) at least one antifungal agent;

(B) at least one C 10 or lower fatty acid or its ester; and

(C) at least one excipient.

Yet another aspect of the present invention is to provide methods for the treatment of fungal infections comprising administering to a patient in need thereof an antifungal composition of the present invention.

Antifungal agent as used herein includes, but is not limited to piroctone olamine, ciclopirox olamine, ketoconazole, climbazole, miconazole nitrate, itraconazole, fluconazole, econazole, terconazole, saperconazole, amorolfme, oxiconazole, clotrimazole, Miconazole, terbinafme, butenafine, naftifme, selenium disulfide, salicylic acid, sulfur, tar preparations, capric acid and derivatives, caprylic acid and derivatives, zinc pyrithione, hinokitol. and chemical compounds from natural sources, such as extract of arnica, walnut shells, tea tree oil, rosemary oil, birch. Other antifungal agents known to the art-skilled may also be used in the compositions of the present invention.

In one embodiment, the antifungal agent used in the composition of the present invention is piroctone olamine. In another embodiment, the antifungal agent is ketoconazole. In yet another embodiment of the present invention, the composition comprises a combination of piroctone olamine and ketoconazole.

The amount of antifungal agent used in the compositions of the present invention is in the range of from about 0.01% to about 10% by weight of the total composition. In one embodiment, the antifungal agent is in the range of from about 0.01% to about 5% by weight of the total composition. In a further embodiment, the antifungal agent is in the range of about 0.01% to about 2% by weight of the total composition.

Oil as used herein includes, but is not limited to, paraffin oil, silicone oils, terpenes, fatty alcohols, dibutyl adipate, dioctyl adipate, fatty acids/esters (devoid of more than C10-) or a combination thereof.

As used herein, less than Cl l fatty acid and/or its ester includes, but is not limited to propionic acid, butyric acid, pentanoic acid, hexanoic acid, heptanoic acid, caprylic acid, nonanoic acid, capric acid, Mono/di ester of these acids with propylene glycol, mono/di/tri esters of these acids with glycerol, and combinations thereof.

Essential oils as used herein include, but are not limited to, natural and synthetic oils such as eucalyptus oil, rosemary oil, pine needle oil, tea tree oil, sage oil, cinnamon oil, lemon oil, lime oil, orange oil, peppermint oil, spearmint oil, wintergreen oil, sweet birch oil, clove leaf oil, camphor oil, cardamon oil, cedar leaf oil, sweet birch oil and others known to the art-skilled.

The amount of oil used in the compositions of the present invention is in the range of about 0.5% to about 99% by weight of the total composition, more preferably 50% to 99% when formulated as oil, 5% to 50% when formulated as cream ointment or 0.5 % to 20 % when formulated as gel/serum/spray.

As used herein, excipient includes, but is not limited to, solvents, surfactants and additives used in pharmaceutical and cosmetic formulations. The amount of excipients used in the compositions of the present invention is in the range of about 0.5% to about 99% by weight of the total composition.

Solvents as used herein include, but are not limited to, C-l to C-6 lower aliphatic alcohols, such as, for example, ethanol, isopropyl alcohol, butanol and the like, lower alkyl acetate, ethers, carboxylic acid and derivatives containing carbon chain length less than Cl l (caprylic acid, capric acid and the like) or mixture/s thereof, fatty alcohols such as undecanol, oleyl alcohol, lauryl alcohol or combinations thereof. Additives as used herein include, but are not limited to, thickeners, antioxidants, perfumes/fragrances, essential oils, pH adjusters, herbal extracts, preserving agents, hair conditioning substances, hair care adjuncts, skin care adjuncts, emollient, dyestuffs, moisturizers, vitamins, sphingoceryls, sunscreens, surfactants, oil-soluble polymers which are compatible with the base oil and/or skin care agents including skin-nutrient agents, anti- wrinkle agents, light and dust protectors.

For example, compositions of the present invention may contain additives such as thickeners (for example, bentonite, cellulose and the like), antioxidants (for example, butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), tert-butylhydroquinone (TBHQ), ferulic acid, Vitamin A, Vitamin E (Tocopherol)), preservatives (for example, methyl p-hydroxybenzoate or propyl p- hydroxybenzoate, sorbic acid and the like), hair care ingredients (for example, fatty alcohols, peptides, proteins, vitamins and mixtures thereof), light protective agents or sunscreens (for example, p-methoxycinamic acid isoamyl ester and the like).

Surfactants as used herein include, but are not limited to, cetearths, ceteth, isoceteths, laureths, oleths, steareths, lauramide DEA, linoleamide DEA and other surfactants which are suitable for topical application.

As used herein, pH adjusters include, but are not limited to, inorganic or organic acids (e.g., citric acid, lactic acid, succinic acid, acetic acid, fumaric acid, glycolic acid, benzoic acid), bases, salts and/or buffers thereof.

Herbal extracts as used herein include, but are not limited to, Amla fruit extract, Arnica Extract, Brahmi extract and others known to the art-skilled.

Hair care adjuncts as used herein include, but are not limited to, ingredients beneficial in the treatment of hair loss or the promotion of hair growth such as taurine, caffeine, minoxidil, azelaic acid, marine cartilage, hydrolysed keratin, biotin, niacin, panthenol, vitamin B6, zinc, copper, peptides, horsetail silica, beta sitosterols, pycnogenol, PABA, green tea extract, folic acid, iron, L-cysteine, magnesium, ginseng and others known to the art-skilled. Skin care adjuncts as used herein include, but are not limited to, those that are beneficial for the treatment of various skin conditions (like dry skin, oily skin, fine lines, pigmentation, etc.) such as proteins, vitamins (e.g., A, B, C, D, E, and K), trace metals (e.g., zinc, calcium and selenium), moisturizers (e.g. , emollients, humectants, film formers, occlusive agents, and agents that affect the natural moisturization mechanisms of the skin), UV absorbers (physical and chemical absorbers such as paraminobenzoic acid (PABA), titanium dioxide, zinc oxide, etc.), anti- irritants (e.g., steroids and non-steroidal anti-inflammatories), botanical extracts (e.g., aloe vera, chamomile, cucumber extract, ginkgo biloba, ginseng, and rosemary), absorbents (e.g. , aluminum starch octenylsuccinate, kaolin, corn starch, oat starch, cyclodextrin, talc, and zeolite), skin bleaching and lightening agents (e.g., hydroquinone and niacinamide lactate), humectants (e.g., sorbitol, urea, and manitol), exfoliants, skin conditioning agents (e.g., aloe extracts, allantoin, bisabolol, ceramides, dimethicone, hyaluronic acid, and dipotassium glycyrrhizate) and other natural components (e.g., oatmeal) known to the art-skilled.

In yet another embodiment of the present invention, the topical anti-dandruff hair oil composition comprising:

(a) antifungal agent selected from the group consisting of piroctone olamine, ketoconazole, zinc pyrithione or combination thereof; wherein said antifungal agent is present in the range of 0.01 % to about 10%, more preferably in the range of 0.01% to 5%, more preferably in the range of 0.01% to 2% by weight of the total composition.

(b) oil selected from the group consisting of paraffin oil, salicylic acid, capric acid and derivatives, caprylic acid and derivatives, fatty acid or esters having carbon chain length less then C- 10 or a combination thereof wherein said oil is present in the range of 1 % to 99%;

(c) solvent selected from the group of lower aliphatic alcohols, lower alkyl acetate, ethers, carboxylic acid or derivatives containing carbon chain length less than CI 1 , fatty alcohols or a combination thereof; and

(d) additive selected from the group of thickener, antioxidant, perfume/fragrance, essential oil, pH adjuster, herbal extract, preserving agent, hair conditioning substance, hair care adjunct, skin care adjunct, skin care agent, skin-nutrient agent, emollient, dyestuff, moisturizer, vitamin, sphingoceryl, sunscreen, surfactant, oil-soluble polymer, anti-wrinkle agent, light or dust protector or a combination thereeof. In yet another embodiment of the present invention provides methods for the treatment of fungal infections comprising administering to a patient in need thereof an antifungal composition of the present invention, said composition comprising at least one antifungal agent, at least one oil and at least one excipient, said composition being devoid of CI 1 or higher fatty acids and their esters. The term "treatment" covers any topical fungal treatment in a mammal, such as a human.

The topical compositions of the present invention are used in the treatment of diseases associated with Malassezia including, but not limited to, tinea pedis, tinea capitis, tinea cruris, tinea glabrosa, tinea corporis, onychomycosis, pityriasis capitis, pityriasis vesicolor, pityrosporum folliculitis, seborrheic dermatitis. Compositions of the present invention are also used in the treatment of diseases associated with other fungi like Trychophyton rubrum or Trychophyton mentagrophytes or Microsporum species, or Epidermophyton species, or Candida albicans, etc. and other nondermatophyte molds.

The compositions of the present invention are also of veterinary use in the topical treatment of dermatological fungal infections.

Compositions of the present invention provide better retention and penetration of antifungal agent onto the hair, skin, scalp and nails. Accordingly, the present invention provides compositions and methods of treating fungal infections of the skin, scalp, hair or nail. In one embodiment of the present invention, the antifungal composition is topical hair oil. In another embodiment, the antifungal composition of the present invention is anti-dandruff oil. In yet another embodiment, the composition of the present invention is a hair gel. In a further embodiment, the composition of the present invention is a nail varnish.

The compositions of the present invention can be in the form of oils, creams, lotions, serums, gels, ointments, foams, sprays or aerosols.

The following examples serve to further illustrate the present invention and are not to be construed to limit the scope of the present invention. EXAMPLES

Example 1: Preparation of various oil compositions containing Piroctone Olamine

The compositions were prepared by dissolving the active agent in ethanol or isopropyl alcohol (IP A). The oleyl alcohol was then added and stirred until a homogenous solution was obtained. Other excipients or additives were added and stirred to get clear solution except liquid paraffin. Weight was finally made up with liquid paraffin and stirred until homogenous solution was obtained. Final formulations were clear transparent oil solutions. Table 1 describes anti-fungal clear oil compositions containing piroctone olamine as anti-fungal agent using various excipients or additives.

Result:

1. Compositions using liquid paraffin as base oil containing piroctone olamine, were clear oil solutions.

2. Addition of other excipients such as tea tree oil, cyclomethicone (D ), tocopherol acetate etc. did not affect the physical stability of formulations as compositions appeared as clear oil solution.

Example: 2 Preparation of various oil compositions containing ketoconazole

The compositions were prepared by dissolving the active agent in ethanol. The oleyl alcohol was then added and stirred until homogenous solution was obtained. Other excipients or additives were added and stirred to get clear solution except liquid paraffin. Weight was finally made up with liquid paraffin and stirred until homogenous solution was obtained. Final formulations were clear transparent oil solutions. Table 2 describes anti-fungal clear oil compositions containing ketoconazole as anti-fungal agent using various excipients or additives.

Result:

1. Compositions using liquid paraffin as base oil containing ketoconazole, were clear oil solutions.

2. Addition of other excipients such as tea tree oil, terpene-4-ol, caprylic acid, cyclomethicone (D ) etc. did not affect the physical stability of formulations and compositions appeared as clear oil solution. Example 3: Study of oil containing fatty acid/esters as a source of nutrients for the growth of M. furfur under in vitro condition.

Malassezia species are lipophilic unipolar yeasts recognized as commensals of skin that may be pathogenic under certain conditions (Indian Journal of Medical Microbiology, (2004) 22 (3):179-181). To compare lipid requirements of the fungus most closely associated with dandruff/seborrheic dermatitis, the best studied Malassezia species is M. furfur. Lipid assimilation in vitro assay was designed to investigate lipid effect on growth of M. furfur (MTCC 1374).

Method: Briefly, Sabouraud Dextrose containing low-melt agar was melted, cooled to 38°C. Fatty acids/esters constituents eg, capric acid, caprylic acid, linoleic acid, oleic acid, lauric acid, palmitic acid,ethyl oleate, isopropyl myristate and oils containing fatty acid/esters eg, coconut oil, mustard oil etc., were added to study the growth of the fungus (Kaw Bing CHUA, et al Malaysian J Pathol (2005) 27(2): 99). After solidification, agar plates were streaked with M.furfur innoculum adjusted to appropriate cfu/ml, aseptically. Positive control with 2% olive oil and negative control without fatty substance were also maintained.

Results:

1. Results showed that there was no growth of M. furfur in absence of fatty acids/esters or oils in in vitro condition (Fig. 1) up to 6 days.

2. Culture media which contained fatty acids or esters eg, linoleic acid, oleic acid, lauric acid, palmitic acid, ethyl oleate, isopropyl myristate and oils containing fatty acid/esters eg, coconut oil, mustard oil etc. were showed confluent growth of fungus up to 6 days.

3. Culture media with lower carbon fatty acids (C<10) eg, caprylic acid (C8) and capric (CIO) were failed to provide nutrient for the growth of fungus and no growth was observed up to 6 days.

Example 4: Bioactivity of oil compositions described in Example 1 against M. furfur

The Minimum Inhibitory Concentration (MIC) is considered as an index for indicating Antifungal efficacy. Therefore lower the value of MIC of the composition, the better is its anti-fungal efficacy. Method: The in vitro activities of some of the oil compositions containing piroctone olamine against Malassezia furfur (MTCC 1374) were determined by agar dilution methods (Jan Faergemann, et al Acta Derm Venereol, (2006), 86:312; Irith Wiegand, et al Nature Protocols (2008), 3:163) Appropriate dilutions of solubilized antifungal compositions were added to molten Leeming Notman Medium. Once the plates were set, M.furfur innoculum adjusted to appropriate cfu/ml was streaked on the agar plates and incubated for 6 days. After incubation, the plates were observed at day 3 and day 6 for visible M.furfur growth. The MIC is defined as as the lowest concentration of antifungal agents that inhibits visible growth of fungus.

Results:

1. Piroctone olamine containing oil compositions VPO-018, VPO-022, and VPO-028 with different solvents isopropyl alcohol, oleyl alcohol, and ethanol, respectively, showed MIC at 32μg/ml which is similar to the MIC of positive control where drug is dissolved in DMSO at the same concentration as shown in Table 3.

Addition of other additives such as caprylic acid, cyclomethicone (D ), tocopherol acetate etc. did not affect the MIC of oil compositions when used in concentration shown in table 1.

Example 5: Bioactivity of oil compositions described in Example 2 against M. furfur

Method: The in vitro activities of some of the oil compositions containing ketoconazole against Malassezia furfur (MTCC 1374) were determined by agar dilution methods. Appropriate dilutions of antifungal compositions were added to molten Leeming Notman Medium. Once the plates were set, M.furfur innoculum adjusted to appropriate cfu/ml was streaked on the agar plates and incubated for 6 days. After incubation, the plates were observed at day 3 and day 6 for visible M. furfur growth. The MIC is defined as the lowest tested dilution of antifungal active that yields no growth.

Result:

1. Ketoconazole containing oil compositions showed MIC at 0.25μg/ml, which is similar to the MIC of positive control where drug is dissolved in DMSO at the same concentration as shown in Table 4. Example 6: Effect of various fatty acids/esters on the in vitro growth of M. furfur

A) Study of various oils which are glycerol or glycol esters (less than C-11 carbon number) on the growth of M.furfur under in vitro conditions

Malassezia species are lipophilic, unipolar yeasts recognized as commensals of skin that may be pathogenic under certain conditions. To compare lipid requirements of the fungus most closely associated with dandruff/seborrheic dermatitis, the best studied Malassezia species is M. furfur. A lipid assimilation in vitro assay was designed to investigate lipid effect <C- 11 fatty acid or their esters on growth of M. furfur (MTCC 1374).

Briefly, Sabouraud Dextrose containing low- me It agar was melted and cooled to 38°C. Fatty acids/esters constituents, e.g., caprylic acid, capric acid and Monocaprylate of propylene glycol, were added in 2% concentration to study the growth of the fungus. After solidification, agar plates were streaked with M. furfur innoculum adjusted to appropriate cfu/ml, aseptically. Positive control with 2% olive oil and negative control without fatty substance were also maintained.

Culture media with lower carbon fatty acids (less than C-1 1) such as caprylic acid (C-8) and capric acid (C-10) failed to serve as nutrients for the growth of fungus and no growth was observed for up to 6 days, while media supplemented with 2% olive oil showed confluent growth of fungus in the same duration. This is shown in Figure 2.

B) Study of various oils which are C-11 or greater fatty acid or their esters on the growth of M. furfur under in vitro conditions

A lipid assimilation in vitro assay was designed to investigate lipid effect >C-10 fatty acid or their esters_on growth of M. furfur (MTCC 1374). Sabouraud Dextrose containing low-melt agar was melted and cooled to 38°C. Fatty acids/esters constituents, e.g. fatty acids or esters, such as lauric acid, palmitic acid, myristic acid, oleic acid, linoleic acid, isopropyl myristate, ethyl oleate, mustard oils, coconut oil were added at different concentration to study the growth of the fungus. Positive control with 2% olive oil and negative control without fatty substance were also maintained. After solidification, agar plates were streaked with M. furfur innoculum adjusted to appropriate cfu/ml, aseptically. Culture media with higher carbon fatty acids and esters (more than C-10) such as lauric acid, palmitic acid, myristic acid, oleic acid, linoleic acid, isopropyl myristate, ethyl oleate, showed confluent growth of fungus for up to 6 days. Interestingly vegetable oils such as mustard oils, coconut oil also showed confluent growth of M.furfur as shown in Figure 3. In addition media supplemented with 2% olive oil showed confluent growth of fungus in the same duration while the media without oil supplement did not show any growth.

Example 7: Preparation of oil compositions devoid of C-11 or greater fatty acids/esters containing antifungal agent or combination thereof.

A) Preparation of oil compositions devoid of C-11 or greater fatty acids/esters containing piroctone olamine as antifungal agent.

These compositions were prepared by dissolving the active agent in ethanol or other suitable solvent. The oleyl alcohol was then added and stirred until a homogenous solution was obtained. Other excipients or additives were added and stirred to obtain a clear solution except liquid paraffin. The total volume was finally made up with liquid paraffin and stirred until homogenous solution was obtained. Final formulations were clear transparent oil solutions and coded as IP, 2P, 3P and 4P as given in Table 5. All compositions are clear transparent solutions. In compositions IP and 2P, caprylic acid was added to balance the pH of the formulations.

B) Study of MIC of oil compositions devoid of C-11 or greater fatty acids/esters containing antifungal agent piroctone olamine against V/. furfur under in vitro conditions.

As shown in Table 6 and Table 7, oil compositions containing piroctone olamine devoid of C-l 1 or greater fatty acids or their esters showed MIC in the range of 16-32 μg/ml against M. furfur and in the range of 8-16 μg/ml against M.obtusa. Composition having similar amount of piroctone olamine with 5% sunflower oil and 10% oleic acid were showed MIC at 64μg/ml against both the strains. These results show that the presence of vegetable oil (sunflower) which is rich in triglycerides/free fatty acids above C-10, has an adverse effect on the activity of the antifungal agent. Similarly, the presence of fatty acids above C-10 (such as oleic acid) also has an adverse effect on the activity of the antifungal agent.

C) Preparation of oil compositions devoid of C-11 or greater fatty acids/esters containing ketoconazole as antifungal agent. These compositions were prepared by dissolving the active agent in ethanol or other suitable solvent. The oleyl alcohol was then added and stirred until a homogenous solution was obtained. Other excipients or additives were added and stirred to obtain a clear solution except liquid paraffin. The total volume was finally made up with liquid paraffin and stirred until homogenous solution was obtained. Final formulations were clear transparent oil solutions and coded as IK, 2K, as given in Table 8. All compositions are clear transparent solutions.

D) Preparation of oil compositions devoid of C-ll or greater fatty acids/esters containing piroctone olamine and ketoconazole as antifungal agents in combination.

These compositions were prepared by dissolving the active agent in ethanol or other suitable solvent. The oleyl alcohol was then added and stirred until a homogenous solution was obtained. Other excipients or additives were added and stirred to obtain a clear solution except liquid paraffin. The total volume was finally made up with liquid paraffin and stirred until homogenous solution was obtained. Final formulations were clear transparent oil solutions and coded as 1PK, 2PK, as given in Table 9.

E) Preparation of oil compositions devoid of C-ll or greater fatty acids/esters containing antifungal agent with hair growth promoter, Minoxidil.

The compositions were prepared as described above and coded as 1PM, 2PM and 3PM, as given in Table 10.

Example 8

A) Preparation of various gel compositions devoid of C-ll or greater fatty acids/esters containing different antifungal agents.

Initially, carbopol was added to the water and allowed to swell for 24 hours. Antidandruff agent was dissolved in minimum quantity of solvent and added to the carbopol base, followed by neutralization with a dilute aqueous solution of triethanolamine or sodium hydroxide to obtain pH 5.0-7.0. The gel compositions were coded as 1G, 2G, 3G, 4G, 5G and 6G as shown in Table 11.

B) Study of zone of inhibition (ZOI) of gel compositions devoid of C-ll or greater fatty acids/esters containing antifungal agent piroctone olamine against M. furfur under in vitro conditions. To study the efficacy of gel compositions, ZOI was determination by Agar Well Diffusion method. Observations were shown in Table 12.

Results: As shown in Table 12, gel composition (1G) containing piroctone olamine showed ZOI (zone of inhibition) in the range of 1.2-0.9 cm against M. furfur. Whereas, composition (2G) with similar amount of piroctone olamine along with 4% propylene glycol mono caprylate showed ZOI 1.5-1.3 cm against M. furfur. After incorporation of 10 % oleic acid with base formulation 1 G, zone of inhibition was not observed. These results showed that the presence of oleic acid which is free fatty acids above C-10 has an adverse effect on the activity of the antifungal agent.

Example 9: Preparation of various cream compositions devoid of C-ll or greater fatty acids/esters containing different antifungal agents

Creams were prepared by fusion method, where all oil soluble ingredients were weighed and melt at a temperature of 60-80°C. Aqueous phase was maintained at the same temperature and oil phase was poured into aqueous phase with constant stirring, followed by slow cooling with moderate stirring. The cream compositions were coded as 1C, 2C, 3C, 4C as shown in Table 13.

The antifungal compositions as disclosed in the invention are thus attained in a practical, and facile manner. While preferred aspects and example configurations have been shown and described, it is to be understood that various further modifications and additional configurations will be apparent to those skilled in the art. It is intended that the specific embodiments and configurations herein disclosed are illustrative of the preferred nature and best mode of practicing the invention, and should not be interpreted as limitations on the scope of the invention.

Table 1: Piroctone olamine - oil compositions

C- Clear, ST- Slight turbid, PO- Piroctone olamine, IPA-Isopropyl alcohol, OA-oleyl alcohol, Cap.A- Caprylic acid, Toco. Ace. -Tocopherol acetate, TTO-tea tree oil, LLP -light liquid paraffin, App-appearance Table 2: Ketoconazole - oil compositions

C-Clear transparent, ST-Slight turbid

Table 3: Results of MIC for oil compositions of piroctone olamine

"+" indicates growth of fungus and " -" indicates no growth of fungus

Table 4: Results of MIC for oil compositions of ketoconazole

indicates growth of fungus and " -" indicates no growth of fung

Table 5: Oil compositions containing piroctone olamine as antifungal agent

^: q.s. Quantity sufficient

Table 6: MIC of oil compositions containing piroctone olamine against M. furfur

"+" indicates growth of fungus and " --" indicates no growth of fungus

Table 7: MIC for oil compositions containing piroctone olamine against M. obtusa

"+" indicates growth of fungus and " -" indicates no growth of fungus

Table 8: Oil compositions containing ketoconazole as antifungal agent

*q.s. Quantity sufficient

Table 9: Oil compositions containing piroctone olamine and ketoconazole in combination

^: q.s. Quantity sufficient Table 10: Oil compositions containing piroctone olamine as antifungal agent and Minoxidil

^: q.s. Quantity sufficient

Table 11: Gel compositions containing antifungal agents devoid of C-11 or greater fatty acids/esters

^: q.s. Quantity sufficient Table 12: Zone of inhibition of gel compositions containing piroctone olamine against M. furfur

Zone of Inhibition (in cm)

Formulations

Setupl Setup2 Setup3

IG 1.2 1.0 0.9

2G 1.4 1.5 1.3

lG with 10 %

~ — ~

oleic acid

Gel base without

anti-fiingal agent

~ — ~

(negative

control)

Table 13: Preparation of cream compositions containing antifungal agents Piroctone olamine or ketoconazole.

*q.s. Quantity sufficient