Polyherbal Niosomal Gel for Anti-Acne Therapy: Recent Advances in Curcumin, Tea Tree Oil, and Aloe Vera-Based Topical Delivery

 

 

Figure 1. Formation of Acne Vulgaris

2.2 Etiology

The causes of acne vulgaris are:

• Excess sebum production
• Follicular hyperkeratinisation
• Cutibacterium acnes proliferation
• Inflammation
• Hormonal changes

2.3 Classification of Acne

Acne vulgaris can be classified by type and severity:⁹

• Non-Inflammatory acne: Blackheads and Whiteheads
• Inflammatory acne: Papules, Pustules, Nodules and Cysts

2.4 Complications

Untreated or severe acne can cause scarring, post-inflammatory hyperpigmentation and     persistent erythema.¹⁰

2.5 Diagnosis

The diagnosis of acne vulgaris is mainly based on history, lesion morphology, distribution and severity. Laboratory tests are not usually needed unless an underlying condition is      suspected.²

2.6 Need for Novel Therapeutic Strategies

Current acne treatments have limitations, like resistance and local irritation.³ There is a need for therapeutic strategies, including topical formulations with natural bioactive compounds and advanced drug delivery systems.⁸ Herbal substance like curcumin, tea tree oil and aloe vera confirms, in treating acne vulgaris.⁴

3.NANOTECHNOLOGY IN TOPICAL DRUG DELIVERY

Nanotechnology has become an important approach in modern medicine because it improves drug delivery.¹¹ In topical therapy, the skin's outer layer, called the stratum corneum, acts as a barrier that limits drug penetration.¹² Nanotechnology-based carriers help drugs cross this barrier and reach deeper layers of the skin, improving drug absorption, effectiveness, and   targeted delivery while reducing side effects.¹¹

3.1 Overview

Nanotechnology is the branch of science that deals with the design, development, application of materials and systems with dimensions ranging from 1 to 100 nanometer (nm).¹³                     In medicine, it improves drug delivery by enhancing drug stability, increasing effectiveness, and enabling targeted delivery with fewer side effects.¹¹

3.2 Benefits of Nanotechnology in Topical Drug Delivery

There are benefits of using Nanotechnology in drug delivery.

Here are a few:

• It helps the Nanotechnology based drugs get through the skin better.
• It keeps the Nanotechnology based drugs in the skin for longer.
• It makes the Nanotechnology based drugs more stable.
• It protects the Nanotechnology based drugs from the environment.
• It gives us control over, how the Nanotechnology based drugs are released.
• It makes the Nanotechnology based drugs work better.
• It reduces the number of times of drug application.
• It reduces the risk of side effects.

3.3 Nanocarriers Used in Topical Drug Delivery

There are kinds of nanocarriers used in drug delivery.

Here are a few:¹¹

1. Liposomes
2. Niosomes
3. Ethosomes
4. Transfersomes
5. Solid Lipid Nanoparticles
6. Nanostructured Lipid Carriers
7. Polymeric Nanoparticles

3.4 Role of Nanotechnology in Herbal Acne Treatment

Many herbal medicines used for acne, such as curcumin, have poor water solubility and low stability, which can reduce their effectiveness.⁷ Nanotechnology helps overcome these      limitations by improving drug solubility, stability, and skin penetration. Nanocarriers also provide controlled and targeted drug release to the affected area, increasing therapeutic      effectiveness while reducing side effects. As a result, nanotechnology enhances the overall performance of herbal anti-acne treatments and improves patient outcomes.¹¹

4.NIOSOMES

Niosomes are microscopic vesicles made up of non-ionic surfactants and cholesterol. They form a bilayer structure on hydration and can encapsulate both hydrophilic and lipophilic drugs. Niosomes are widely used as drug carriers because they improve drug stability and enhance drug delivery. They were developed as a more stable, cost-effective, and easily    prepared alternative to liposomes.⁸

4.1 Overview

Niosomes are closed vesicles. They are made when non-ionic surfactants get wet. Cholesterol helps make them stable. They can hold water-loving drugs inside and oil loving drugs       outside.

 

 

Figure 2. Structure of Niosome

4.2 Composition of Niosomes

In what niosomes are made of is very important. It affects how they form. how stable they are and how they release drugs.¹³

Non-ionic Surfactants

Non-ionic surfactants are the part of niosomes. They form the bilayer membrane.⁸ Some used surfactants are:

• Span 20
• Span 40
• Span 60
• Span 80
• Tween 20
• Tween 40
• Tween 60
• Tween 80

• Brij series surfactants

The surfactant used affects the size, stability and permeability of niosomes.¹³

Stearic acid

Stearic acid is added to niosomes to make them more stable. It reduces leakage and makes them less permeable.¹³

Hydration Medium

The liquid used to make niosomes affects how they form. It can be buffer, water or other   liquids.¹³

4.3 Classification of Niosomes

Niosomes can be classified based on their size and layers:¹³

• Unilamellar vesicles (SUVs)
• Large unilamellar vesicles (LUVs)
• Multilamellar vesicles (MLVs)
• Multivesicular niosomes

Each type has characteristics and release profiles.

4.4 Methods of Preparation

There are ways to make niosomes:¹³

1. Thin-Film Hydration Method
2. Reverse-Phase Evaporation Method
3. Ether Injection Method
4. Sonication Method
5. Microfluidization Method
6. Bubble Method

4.5 Mechanism of Drug Entrapment

Niosomes can hold both water-loving and fat-loving drugs. The drugs are trapped inside or outside the niosomes.⁸

4.6 Mechanism of Skin Penetration

When niosomes are applied to the skin they interact with the skin surface. They can improve drug penetration and retention.¹⁴

4.7 Advantages of Niosomes

Niosomes have advantages:⁸

• They can hold both water-loving and fat-loving drugs.
• They are stable and can protect the drugs.
• They can improve drug penetration and retention.
• They can release drugs slowly.

4.8 Limitations of Niosomes

Niosomes also have some limitations:¹³

• They can stick together.
• Drugs can leak out.
• They require optimization of surfactant and cholesterol ratios.

4.9 Characterization of Niosomes

Niosomes need to be characterized to ensure their quality:¹³

• Particle size analysis
• Zeta measurement
• Entrapment efficiency assessment
• Morphological examination

4.10 Pharmaceutical Applications of Niosomes

Niosomes have medical applications:⁸

• Topical drug delivery
• Transdermal therapy
• Formulations
• Oral drug delivery

4.11 Niosomes in Acne Therapy

Niosomes can be used to treat acne. They can deliver drugs directly to the skin. Improve their penetration.¹⁴

4.12 Role of Niosomes in the Present Formulation

The present formulation uses niosomes to deliver curcumin and tea tree oil. Niosomes can improve the stability and penetration of these drugs.⁸

5.NIOSOMAL GEL

Niosomal gel contain niosomal vesicles in a gel base. They improve drug stability, enhance skin penetration, and provide sustained drug release.¹⁵ Aloe vera helps soothe the skin, reduce irritation, and support healing.⁶

5.1 Overview

A niosomal gel is a topical dosage form designed for application to the skin. It is prepared by incorporating drug-loaded niosomal vesicles into a suitable gel base.¹⁵ The gel helps the   medicine stay in the skin and makes easier to use.

5.2 Composition of Niosomal Gel

A niosomal gel has parts:

Drug-Loaded Niosomes

These are tiny vesicles that carry the medicine. They helps to keep the medicine safe and   release the drug slowly.¹⁵

Gel Base

This is the gel that the niosomal vesicles are mixed with. It helps the medicine to stay on the skin and makes it easier to apply.

Humectants and Moisturizers

These are ingredients that help keep your skin hydrated and feel good. They can also help the medicine spread evenly on the skin.

Preservatives

These are ingredients that helps to keep the medicine from spoiling. They prevent bacteria and other germs from growing in the medicine.

pH Adjusting Agents

These are ingredients that helps to keep the medicine at the pH level. This is important      because the medicine pH must be same as the skin pH to work properly.

5.3 Benefits of Niosomal Gel

• Enhances drug penetration through the skin.
• Provides sustained and controlled drug release.
• Increases drug retention at the application site.
• Protects the drug from degradation and reduces the frequency of application.

5.4 Mechanism of Niosomal Gel

When a niosomal gel is applied to the skin, it spreads evenly and adheres well to the skin   surface. The drug is gradually released from the niosomal vesicles and penetrates into the skin. This prolonged release enhances drug retention at the application site, improves skin penetration, and increases therapeutic effectiveness.¹⁵

5.5 Dermal Penetration of Niosomal Gel

Niosomal vesicles enhance drug penetration into the skin and can reach hair follicles, making them effective for acne treatment. This improves drug delivery, reduces inflammation, and helps control acne-causing bacteria.¹⁴

5.6 Applications of Niosomal Gel in Herbal Medicine 

Some herbal medicines do not work well on the skin; they are not soluble in water or do not penetrate into the skin well.⁷ Niosomal gel can carry the medicine into the skin and keep it there for a longer time.¹⁵

5.7 Aloe Vera in Niosomal Gel

Aloe vera soothes the skin, improves hydration, and enhances the effectiveness of niosomal gel. It also helps improve drug penetration and supports skin healing.⁶

5.8 Benefits of Curcumin-Tea Tree Oil Niosomal Gel with Aloe Vera

It helps the curcumin penetrate the skin better.¹⁵ It protects the tea tree oil from breaking down.⁵ Aloevera reduces irritation and makes skin feel better.⁶

5.9 Challenges in Formulating Niosomal Gels

Making niosomal gel can be tricky. It is important to make sure the niosomal vesicles do not break down and the medicine does not leak out. The gel needs to be the consistency. It is also important to make sure the medicine is stable and works over time.¹⁵

6.FORMULATION COMPONENTS

In this formulation curcumin and tea tree oil are the ingredients. Aloe vera is also added for its healing and therapeutic properties.¹⁶ Other ingredients like cleaners, cholesterol, solvents, gelling agents, preservatives and other medicine helpers are added. They increase stability and effectivess.¹⁵

6.1 Curcumin

Description

Curcumin is a compound found in Curcumalonga.⁷

 

 

Figure 3. Curcumin

Role in the Formulation

• Reducing inflammation
• Fighting stress
• Killing microbes

• Healing tissue
• Preventing skin damage

Formulation Challenges

Curcumin has some challenges.

These are:

• Not dissolving in water
• Not being easily absorbed
• Not penetrating skin well
• Being chemically unstable

So, curcumin is put into vesicles. This helps overcome these limitations.⁸

6.2 Tea Tree Oil
Description

Tea tree oil is an oil from Melaleuca alternifolia.⁵

 

 

Figure 4. Tea Tree Oil

Role in the Formulation

• Killing acne-causing microbes
• Reducing inflammation
• Preventing microbe growth
• Supporting skin healing

Formulation Challenges

Tea tree oil has challenges.

These are:

• Evaporating quickly
• Being sensitive to air
•  Not dissolving well in water
• Causing irritation

Encapsulation of tea tree oil in vesicular systems helps improve its stability and reduce volatility.¹⁶

6.3 Aloe Vera

Description

Aloe vera is the medicinal plant.⁶

 

 

Figure 5. Aloe Vera

Role in the Formulation

Aloe vera provides:

• Anti-inflammatory effects
• Antioxidant effects
• Wound-healing properties
• Skin hydration
• Moisturizing action
• Soothing effects

6.4 Nonionic Surfactant

Nonionic surfactant helps to form vesicles.¹³

Used Surfactants

• Span 60

Role in the Formulation

Nonionic surfactant helps with:

• Forming vesicles
• Encapsulating drugs
• Stabilizing vesicles
• Improving skin penetration
• Controlled release of ingredients

6.5 Stearic acid

Description

Stearic acid is a membrane-stabilizing component.¹³

Role in the Formulation

Stearic acid:

• Increases rigidity
• Improves vesicle stability
• Reduces permeability
• Prevents drug leakage

6.6 Organic Solvent

Organic solvents are used during vesicle preparation.¹³

Examples

• Chloroform
• Methanol

Role in the Formulation

Organic solvents help:

• Dissolve surfactants and cholesterol
• Facilitate formation of a lipid film

6.7 Hydration Medium

The hydration medium is essential for vesicle formation.¹³

Common Hydration Media

• Water
• Phosphate buffer solution

Role in the Formulation

The hydration medium contributes to:

• Vesicle formation
• Drug solubilization
• Maintenance of pH

6.8 Gelling Agents

Gelling agents provide the semisolid consistency required for application.¹⁷

Common Gelling Agents

• Carbopol 934

Role in the Formulation

Gelling agents are responsible for:

• Formation of gel structure
• Improvement of viscosity

6.9 Humectants and Penetration Enhancers

These improve hydration of the skin and drug permeation.¹⁷

Examples

• Glycerin
• Propylene glycol

Role in the Formulation

These agents help:

• Maintain moisture content
• Improve skin hydration

6.10 Preservatives

Preservatives prevent contamination. Improve product stability.¹⁷

Examples

• Methyl paraben

Role in the Formulation

Preservatives contribute to:

• Prevention of growth
• Improvement of product safety

6.11 pH Adjusting Agents

pH adjustment is essential to ensure compatibility with the skin.¹⁷

Examples

• Triethanolamine

Role in the Formulation

These agents help:

• Maintain pH

6.12 Purified Water

Purified water serves as the aqueous vehicle.¹⁷

Role in the Formulation

Purified water contributes to:

• Hydration of vesicles
• Preparation of gel base

6.13 Summary of Formulation Components

The formulation uses a combination of agents and pharmaceutical excipients.¹⁵ Curcumin provides Anti-inflammatory activity.⁷ Tea tree oil contributes by reducing the anti-acne      microbes.⁵ Aloe vera offers moisturizing properties.⁶ They help to develop a patient-friendly gel, for topical anti-acne therapy.¹⁵

7. SYNERGY OF CURCUMIN, TEA TREE OIL AND ALOE VERA

The combination of curcumin, tea tree oil and aloe vera is an idea as each one has its own special benefits. When these are put together in a gel formulation, they can work together to make the treatment more effective. They help the skin to heal faster and reduce side effects.¹⁸

7.1 Science Behind Their Combined Effect

Curcumin, tea tree oil and aloe vera work together to help get rid of acne.¹⁸

• Curcumin reduces inflammation and skin damage.
• Tea tree oil fights bacteria and reduces inflammation.
• Aloe vera soothes the skin, reduces inflammation and helps the skin to heal.

7.2 Benefits of Formulating These Ingredients in a Gel

Curcumin and tea tree oil are not easy to use on their own. Curcumin doesn't dissolve well in water and doesn't penetrate into the skin easily.⁷ Tea tree oil can evaporate quickly and lose its effectiveness.⁵ The gel can help them penetrate the skin, reduce side effects and make the treatment more effective.¹⁵

7.3 Outcomes of This Treatment

The combination of curcumin, tea tree oil and aloe vera, in a gel can help get rid of acne by improving the overall therapeutic effectiveness through the complementary actions of these natural ingredients.¹⁸

• Reducing inflammation and skin damage.
• Fighting against bacteria.
• Helping the skin to heal.
• Keeping the skin hydrated and comfortable.
• Reducing the risk of scarring.

8.METHODS OF PREPARATION OF CURCUMIN-TEA TREE OIL NIOSOMAL GEL

The preparation of a curcumin–tea tree oil niosomal gel containing an aloe vera base involves two main steps.¹⁹

First, curcumin- and tea tree oil-loaded niosomes are prepared using the thin-film hydration method. This method is widely used because it provides excellent reproducibility, high drug entrapment efficiency, and allows easy optimization of the formulation.¹³

In the second step, the prepared niosomes are incorporated into an aloe vera-based gel to   obtain the final niosomal gel formulation.¹⁵

8.1 Selection of Materials

Selection of ingredients and pharmaceuticals excipient

Active Ingredients

• Curcumin
• Tea tree oil
• Aloe vera gel

Niosomal Components

• Non-ionic surfactant (Span 60)
• Stearic acid

Organic Solvents

• Chloroform
• Methanol

Gel components

• Carbopol 934

• Triethanolamine
• Propylene glycerin
• Preservatives (Methyl paraben)
• Distilled water

8.2 Preparation of Curcumin–Tea Tree Oil Niosomes

Thin-Film Hydration Method

It enables the formation of stable vesicles capable of efficiently encapsulating both            hydrophilic and lipophilic compounds, making it particularly suitable for the preparation of curcumin–tea tree oil-loaded niosomes.¹³

Step 1: Preparation of the Organic Phase

The required quantities of surfactant (Span 60), Stearic acid, curcumin, and tea tree oil were accurately weighed and dissolved in a mixture of organic solvents, i.e., chloroform and   methanol, to obtain a clear and homogeneous solution. This organic phase served as the    precursor for the formation of the thin lipid film during the subsequent evaporation step.¹⁹

Step 2: Formation of the Thin Lipid Film

The organic solvent mixture was allowed to evaporate while the round-bottom flask was   rotated manually by hand to ensure uniform distribution of the lipid components along the inner wall of the flask. Continuous manual rotation facilitated the formation of a thin and   uniform lipid film as the organic solvents evaporated. The flask was then left until complete evaporation of the solvents before proceeding to the hydration step.¹⁹

Step 3: Hydration of Thin Film

The thin lipid film was hydrated with an appropriate volume of phosphate buffer solution (PBS, pH 7.4) or distilled water under gentle agitation. During hydration, the lipid film swelled and gradually detached from the inner wall of the flask, resulting in the spontaneous formation of multilamellar niosomal vesicles encapsulating curcumin and tea tree oil.¹³

Step 4: Size Reduction of Niosomes

The niosomal suspension was subjected to sonication using a bath sonicator to reduce the   particle size and obtain a more uniform vesicle distribution. Bath sonication helped produce smaller and more homogeneous niosomes.²⁰

Step 5: Storage of Niosomal Dispersion

The prepared niosomal dispersion was transferred to an air tight container and stored under refrigerated conditions (2–8°C) until further use.²⁰

8.3 Preparation of Aloe Vera Gel Base

Prepare the gel base separately using a gelling agent.

Step 1: Hydration of Gelling Agent

The required quantity of Carbopol 934 was slowly dispersed in distilled water with           continuous stirring to prevent lump formation and obtain a uniform dispersion. Leave it 24 hours for swelling.¹⁷

Step 2: Swelling of Polymer

The polymer dispersion was allowed to hydrate and swell completely until a smooth and   uniform gel structure was obtained.¹⁷

Step 3: Addition of Auxiliary Ingredients

Humectants (e.g., propylene glycol or glycerin), preservatives, and aloe vera gel were added to the hydrated polymer dispersion with continuous stirring until a homogeneous gel was   obtained.¹⁷

Step 4: pH Adjustment

Triethanolamine was added gradually to obtain the desired pH and form a homogeneous gel.¹⁷

8.4 Incorporation of Niosomal Dispersion into Aloe Vera Gel

The optimized curcumin–tea tree oil niosomal dispersion was slowly incorporated into the prepared aloe vera gel base with gentle stirring to ensure uniform distribution without        disrupting the vesicular structure.¹⁵

8.5 General Flow Chart of Preparation

 

Selection of Active Ingredients and Excipients

↓

Preparation of Organic Phase

(Curcumin + Tea Tree Oil + Surfactant +Stearic acid)

↓

Formation of Thin Film

(Hand shaking method)

↓

Hydration of Thin Film

↓

Formation of Niosomal Suspension

↓

Sonication/Homogenization

↓

Preparation of Aloe Vera Gel Base

↓

Incorporation of Niosomal Dispersion

↓

Preparation of Curcumin–Tea Tree Oil

Niosomal Gel Enriched with Aloe Vera

↓
Evaluation and Characterization

 

• 6. Significance of the Selected preparation Method
• Niosomal encapsulation enhances the stability, skin penetration, and controlled         release of the active ingredients.
• Incorporation into an aloe vera gel provides moisturizing, soothing, and            wound-healing benefits.

9.EVALUATION PARAMETERS OF CURCUMIN- TEA TREE OIL NIOSOMAL GEL ENRICHED WITH ALOE VERA

Evaluation of pharmaceutical formulations is essential to ensure their quality, efficacy, safety, stability, and patient acceptability.²¹

9.1 Evaluation of Niosomes

Physical Appearance

The prepared niosomal dispersion should be visually examined for:

• Colour.
• Homogeneity.
• Presence of aggregates.
• Sedimentation.
• Phase separation.

Visual examination provides preliminary information regarding formulation quality and    stability.²¹

Particle Size Analysis

Principle

Particle size analysis is commonly performed using dynamic light scattering (DLS), which measures fluctuations in scattered light caused by the Brownian motion of particles.²²

Significance

Particle size influences:

• Skin penetration.
• Follicular targeting.
• Drug release behavior.
• Entrapment efficiency.
• Stability of the formulation.

Smaller vesicles generally exhibit better penetration and therapeutic performance.²²

Zeta Potential Analysis

Zeta potential evaluates the surface charge of vesicles and serves as an indicator of colloidal stability.²²

Principle

The surface charge of the particles is determined by measuring their electrophoretic          mobility.²²

Significance

Zeta potential influences:

• Vesicle aggregation.
• Physical stability.
• Storage characteristics.
• Interactions with biological membranes.

Entrapment Efficiency

Entrapment efficiency determines the percentage of drug successfully incorporated into the niosomal vesicles.¹³

Principle

Entrapped and unentrapped drug fractions are separated by centrifugation or                       ultracentrifugation, after which the drug content is determined.¹³

Calculation:

 

 

Where,

Wtotal = Total amount of drug added during formulation

Wtotal =Amount of free (un-entrapped) drug detected in the supernatant

%EE = Percentage of drug successfully entrapped within the noisome

Significance

Entrapment efficiency provides information regarding:

• Drug loading capacity.
• Formulation efficiency.
• Drug retention ability.
• Therapeutic performance.

Drug Content Estimation

Drug content analysis determines the amount of active ingredient present in the                formulation.²¹

Analytical Methods

• UV-visible spectrophotometry for curcumin.
• Gas chromatography-mass spectrometry (GC-MS) for tea tree oil.

Significance

Drug content estimation helps determine:

• Uniformity of formulation.
• Accuracy of drug incorporation.
• Quality control.
• Stability during storage.

Morphological Evaluation

Morphological studies provide information regarding vesicle shape and surface                characteristics.

Techniques

• Transmission electron microscopy (TEM).
• Scanning electron microscopy (SEM).

Significance

Morphological evaluation helps determine:

• Shape of vesicles.
• Structural integrity.
• Surface characteristics.
• Vesicle distribution.

Polydispersity Index (PDI)

The polydispersity index determines the uniformity of particle size distribution.²²

Significance

PDI values indicate:

• Homogeneity of the formulation.
• Stability of vesicular systems.
• Reproducibility of the preparation method.

Lower PDI values indicate a more uniform particle distribution.

9.2 Evaluation of Niosomal Gel

Physical Appearance

The prepared gel should be evaluated for:

• Color.
• Odor.
• Clarity.
• Texture.
• Homogeneity.

pH Determination

The pH of topical formulations should be compatible with the physiological pH of skin.¹⁷

Significance

Appropriate pH helps:

• Minimize irritation.
• Improve patient comfort.
• Maintain formulation stability.

Viscosity Measurement

Viscosity determines the flow behavior and consistency of the gel.¹⁷

Instrument

• Brookfield viscometer.

Significance

Viscosity affects:

• Drug release.
• Spreadability.
• Residence time.
• Patient acceptability.

Spreadability Study

Spreadability determines the ease with which the gel can be applied over the skin surface.¹⁷

Significance

Good spreadability contributes to:

• Uniform drug distribution.
• Ease of application.
• Better patient compliance.

Homogeneity Test

Homogeneity assessment ensures uniform distribution of active ingredients throughout the formulation.²¹

Significance

A homogeneous gel ensures:

• Uniform dosing.
• Improved therapeutic efficacy.
• Better quality control.

9.3 Skin Irritation Study

Skin irritation studies evaluate the safety of the topical formulation.²³

Parameters Evaluated

• Erythema.
• Edema.
• Burning sensation.
• Irritation score.

Significance

This evaluation ensures:

• Skin compatibility.
• Patient safety.
• Therapeutic acceptability.

9.4 Significance of Evaluation Parameters in the Present Study

1. To evaluate the physicochemical properties of the niosomal gel.

2. To assess the quality of the formulation through particle size, zeta potential, entrapment efficiency, and drug content.

3. To determine the suitability and safety of the gel for topical application.

10.SUMMARY OF PUBLISHED RESEARCH STUDIES

Previous studies support the use of herbal niosomal formulations for acne therapy.²⁴   Nanocarrier systems have been shown to improve drug stability, enhance skin penetration, provide sustained release, and increase the therapeutic efficacy of herbal bioactive           compounds.⁸

Table 10.1: Comparative Analysis of the Herbal Components

Parameter	Curcumin	Tea Tree Oil	Aloe Vera
Source	Curcuma longa	Melaleuca alternifolia	Aloe barbadensis
Primary Activity	Anti-inflammatory	Antimicrobial	Wound healing
Antioxidant Activity	Excellent	Moderate	Good
Antimicrobial        Activity	Moderate	Excellent	Mild
Anti-inflammatory Activity	Excellent	Excellent	Excellent
Wound-Healing      Activity	Good	Moderate	Excellent
Solubility Issue	Poor aqueous               solubility	Poor aqueous          solubility and volatility	Stable gel matrix
Benefit of               Niosomal Delivery	Improved                       bioavailability	Improved stability	Supportive           therapeutic action
Role in Present  Formulation	Active                           anti-inflammatory agent	Active antimicrobial agent	Gel enhancer and healing agent

 

Table 10.2: Advantages of Niosomal Delivery Compared with Conventional Topical
Formulations

Parameter	Conventional Gel/Cream	Niosomal Gel
Drug Stability	Moderate	High
Skin Penetration	Limited	Enhanced
Drug Release	Immediate	Controlled and sustained
Follicular Targeting	Poor	Excellent
Drug Retention	Low	High
Bioavailability	Limited	Improved
Protection of Active Compounds	Minimal	Excellent
Frequency of Application	Frequent	Reduced
Therapeutic Efficacy	Moderate	Enhanced
Patient Compliance	Moderate	Better