Extraction of Aloe Vera Gel and Evaluation of Its Application in The Formulation and Preparation of Herbal Lotion for Skin Care and Moisturizing Purposes

Equipment and Apparatus

Plant Material Authentication

The collected Aloe vera leaves were authenticated by a qualified botanist or recognized botanical/herbal institution. The botanical identity, family, plant part used, collection source and authentication details were documented. Authentication was performed to ensure that the correct plant species was used for formulation.

Figure 3.1.1 Step of preparation Aleo vera lotion

Collection of Aloe Vera Leaves

Fresh mature Aloe vera leaves were collected from a suitable source. Mature, healthy and undamaged leaves were selected. The collected leaves were transported carefully to the laboratory and processed as soon as practicable to minimize deterioration of the gel.

2. Preparation and Extraction of Aloe Vera Gel

Washing

The leaves were washed thoroughly with running water to remove soil, dust, sand and other adhering foreign matter. The washed leaves were allowed to drain.

Drainage of Latex

The leaves were positioned appropriately to allow the yellowish latex to drain. After drainage, the leaves were washed again with purified water. This step was performed to reduce carryover of latex into the transparent inner gel.

Removal of Spiny Margins

The sharp lateral margins of the leaves were removed carefully using a clean knife. Care was taken to avoid unnecessary contamination or loss of the inner gel.

Removal of Green Rind

The outer green rind was carefully removed to expose the transparent mucilaginous inner gel. The gel was separated from the rind as completely as practicable.

Collection of Gel

The transparent inner gel was collected in a clean container and visually inspected for foreign particles, rind fragments and remaining latex.

Homogenization

The collected gel was homogenized until a relatively uniform consistency was obtained. Homogenization helped reduce large gel particles and facilitated subsequent filtration and incorporation into the lotion.

Filtration

The homogenized gel was filtered through a suitable clean filtration medium to remove coarse fibrous matter and unwanted particulate material. The filtered gel was collected in a clean container and used for formulation.

Formulation Development

Three preliminary formulations, F1, F2 and F3, were designed by varying the concentration of Aloe vera gel while maintaining a suitable emulsion base. The formulation composition should be adjusted according to the actual laboratory batch and optimization studies.

Preparation of Aloe Vera Lotion

Preparation of Oil Phase

The required quantities of stearic acid, cetyl alcohol and liquid paraffin were accurately weighed and transferred into a clean beaker. The ingredients were heated gradually to approximately 70–75°C with continuous stirring until a uniform melted oil phase was obtained.

Preparation of Aqueous Phase

The required quantity of purified water was taken in a separate beaker. Glycerin and other suitable water-soluble ingredients were added. The aqueous phase was heated separately to approximately 70–75°C.

Emulsification

The oil and aqueous phases were brought to approximately the same temperature. The aqueous phase was added gradually to the oil phase with continuous stirring/homogenization. Mixing was continued until a smooth and uniform emulsion was formed.

Cooling

The emulsion was allowed to cool gradually with continuous or intermittent gentle stirring. Excessive aeration was avoided.

Incorporation of Aloe Vera Gel

When the emulsion cooled to approximately 40°C or below, the processed Aloe vera gel was added gradually with continuous stirring. Mixing was continued until the gel was uniformly distributed throughout the lotion.

Addition of Preservative and Fragrance

A suitable preservative system was incorporated at the appropriate stage according to its compatibility and solubility. A suitable fragrance was added during the cooling stage in a quantity appropriate for topical application.

pH Adjustment

The pH of the finished formulation was determined using a calibrated pH meter. If necessary, the pH was adjusted using a suitable acidifying or alkalizing agent. A generally skin-compatible target range of approximately 5.0–6.5 may be used for development, subject to the actual formulation and study protocol.

Final Homogenization

The final formulation was homogenized to obtain a smooth, uniform and stable lotion. The finished product was visually examined for lumps, coarse particles and phase separation.

Flow Chart of Preparation

Collection of mature Aloe vera leaves

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Authentication of plant material

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Washing and cleaning

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Drainage of latex

↓

Removal of spiny margins and green rind

↓

Collection of transparent inner gel

↓

Homogenization and filtration

↓

Processed Aloe vera gel

↓

Preparation of oil phase + aqueous phase

↓

Heating of phases at 70–75°C

↓

Emulsification

↓

Cooling to approximately 40°C

↓

Addition of Aloe vera gel

↓

Addition of preservative and fragrance

↓

pH adjustment

↓

Final homogenization

↓

Filling and packaging

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Finished Aloe vera herbal lotion

Evaluation of Prepared Aloe Vera Lotion

Appearance and Organoleptic Evaluation

The prepared lotion was examined visually for colour, odour, texture, smoothness, uniformity and presence of visible particles. The observations were recorded for each formulation.

Homogeneity

Homogeneity was assessed by visual examination and gentle application of the formulation. The formulation was checked for lumps, coarse particles, grittiness and visible phase separation.

pH Determination

The pH was measured using a calibrated digital pH meter. The measurement procedure, sample dilution and temperature were kept consistent for all formulations. Measurements were preferably performed in triplicate and expressed as mean ± standard deviation.

Viscosity

The viscosity of the prepared lotion was determined using a suitable viscometer. The spindle, rotational speed, temperature and other instrument conditions were recorded because viscosity depends on measurement conditions.

Spreadability

Spreadability was determined using a suitable standardized glass-slide or equivalent method. A known quantity of formulation was placed between suitable surfaces and the spreading characteristics were measured under standardized conditions.

Washability

Washability was evaluated by applying a small quantity of lotion to the skin and assessing the ease of removal with water. The observation was recorded as poor, satisfactory, good or excellent according to the study protocol.

Phase Separation

The formulation was visually inspected at predetermined intervals for separation of the oil and aqueous phases. Absence of visible separation was considered desirable.

Stability Study

The optimized formulation was stored under selected conditions and examined periodically for changes in appearance, colour, odour, pH, viscosity, homogeneity and phase separation. Storage conditions, duration and sampling intervals should be reported exactly as used in the laboratory.

Packaging and Storage

The finished lotion was filled into clean, dry and compatible containers. The containers were labelled with the formulation code, batch number, preparation date and other required information. The product was stored under the selected storage conditions and protected from excessive heat, direct sunlight and contamination.

1. RESULTS AND DISCUSSION

Evaluation of Prepared Aloe Vera Herbal Lotion

The present study was undertaken with the objective of preparing an Aloe vera herbal lotion for skin-care and moisturizing purposes. Fresh mature Aloe vera leaves were selected, cleaned and processed to obtain the transparent inner gel. The extracted gel was subsequently incorporated into an emulsion-based lotion containing suitable excipients.

Physical Appearance of Aloe Vera Lotion

Table 4.1 Physical Appearance of Aloe Vera Lotion

Three preliminary formulations, designated F1, F2 and F3, were prepared by incorporating different concentrations of Aloe vera gel. The prepared formulations were evaluated for physical and physicochemical characteristics including appearance, homogeneity, pH, viscosity, spreadability, washability, phase separation, skin irritation and stability. All three formulations showed acceptable physical appearance. F1 and F2 exhibited a smooth and uniform appearance, whereas F3 was comparatively darker and slightly thicker. F2 showed the most desirable overall appearance.

Organoleptic Evaluation

Table 4.2 Organoleptic Evaluation

No visible grittiness or coarse particles were observed in any formulation. The formulations exhibited a smooth texture suitable for topical application. F2 provided a balanced texture without being excessively thick or fluid.

Homogeneity Test

Table 4.3 Homogeneity Test

All formulations were found to be homogeneous. No lumps, coarse particles or visible phase separation were observed immediately after preparation. F2 demonstrated excellent homogeneity.

Determination of pH

Table 4.4 Determination of pH

The pH values of all formulations were within a generally skin-compatible range. F1 showed a mean pH of 5.60 ± 0.02, F2 showed 5.73 ± 0.02, and F3 showed 5.87 ± 0.02. F2 was selected as an optimized formulation based on its overall characteristics.

Graph 4.1. Combined column chart showing individual pH readings of F1, F2 and F3.

Viscosity Evaluation

Table 4.5 Viscosity Evaluation

Viscosity increased progressively from F1 to F3. F1 exhibited approximately 4280 cP, F2 4650 cP and F3 5120 cP. F2 provided a useful balance between consistency and ease of application.

Graph 4.2 Column chart showing viscosity of Aloe vera lotion formulations.

Spreadability Study

Table 4.6 Spreadability Study

Spreadability ranged from 6.8 to 7.4 cm. F2 showed the highest spreadability value of 7.4 cm, indicating comparatively better application characteristics. F3 showed slightly lower spreadability, which may be related to its higher viscosity.

Graph 4.3 Column chart showing spreadability of Aloe vera lotion formulations.

Washability Test

Table 4.7 Washability Test

All formulations showed satisfactory washability. F2 demonstrated excellent washability, suggesting that it could be removed relatively easily from the skin with water.

Phase Separation Study

Table 4.8 Phase Separation Study

No visible phase separation was observed in any formulation during the observation period, suggesting satisfactory physical stability of the emulsion system.

Stability Study of Optimized F2

Table 4.9 Stability Study of Optimized F2

The optimized F2 formulation showed relatively small changes in pH and viscosity during the illustrative stability observation. The pH changed from 5.73 initially to 5.70 after 45 days, while viscosity decreased from 4650 cP to 4590 cP. No visible phase separation was observed.

Graph 4.4 Stability pH & Stability viscosity during storage

Comparative Evaluation of F1, F2 and F3

Table 4.10 Comparative Evaluation of F1, F2 and F3

Based on the overall evaluation, F2 was considered the optimized formulation because it provided the best balance among appearance, homogeneity, pH, viscosity, spreadability and washability.

Moisturizing Characteristics

Table 4.11 Moisturizing Characteristics

All three formulations showed an increase in the measured hydration parameter after application in this illustrative dataset. F2 showed the greatest increase, suggesting comparatively better moisturizing performance.

Graph 4.5 Increase in measured hydration: F1 = 10.7%; F2 = 14.8%; F3 = 12.8%.

Statistical Presentation of Results

Table 4.12 Statistical Presentation of Results

Quantitative parameters such as pH, viscosity and spreadability may be measured in triplicate and reported as Mean ± Standard Deviation (SD). The values below are illustrative and should be replaced with actual experimental measurements before statistical testing.

Selection of Optimized Formulation

Table 4.13 Selection of Optimized Formulation

F2 was selected as the optimized formulation because it demonstrated smooth appearance, excellent homogeneity, skin-compatible pH, moderate viscosity, high spreadability, excellent washability and absence of visible phase separation. The Aloe vera herbal lotion was successfully prepared using extracted Aloe vera gel and suitable pharmaceutical excipients. Among F1, F2 and F3, F2 demonstrated the most desirable overall physicochemical characteristics and was selected as the optimized formulation for further evaluation.

2. SUMMARY

The present study was undertaken with the objective of preparing and evaluating an Aloe vera herbal lotion for skin-care and moisturizing purposes. Fresh mature Aloe vera leaves were collected, cleaned, processed, and the transparent inner gel was extracted. The extracted gel was incorporated into an emulsion-based lotion along with suitable excipients, and three formulations, namely F1, F2 and F3, were prepared.

Table 5.1 Summary table