Cucumber and Mint Soap: Preparation and Evaluation

Patel Azba Siddiq*, Meman Manatasha Riyazbhai, Patel Samiya Mustakali, Pardeshi Shivani Santosh, A.M. Danish

J.I.I.U’S Ali-Allana College of Pharmacy Akkalkuwa, Dist- Nandurbar (425415) Maharashtra, India

*Correspondence: mantashamemon16@gmail.com;

DOI: https://doi.org/10.71431/IJRPAS.2025.41211  

INTRODUCTION

The skin, the body’s largest organ, is continuously exposed to heat, UV radiation, pollution, and oxidative stress—all intensified in the summer. Conventional soaps frequently disrupt the skin’s acid mantle and lipid barrier due to harsh surfactants (e.g., SLS/SLES), increasing dryness, irritation, and transepidermal water loss. In contrast, herbal soaps formulated with botanical extracts, essential oils, and natural humectants offer gentler cleansing, better moisturization, and functional therapeutic effects. [1,5,7,9-14]

Herbal Soap : A medication or drug that contains antibacterial and antifungal agents is herbal soap preparation. The main purposes of plant parts, such as leaves, stems, roots, and fruits, are to treat illnesses or wounds or to encourage overall health. Many businesses now produce herbal soap. Numerous herbal soaps have been produced using various natural ingredients. The skin contains a wide variety of specialized cells and structures. When oil and dead skin cells clog hair follicles, the pyloric gland becomes obstructed or inflamed, resulting in acne vulgaris, a chronic skin condition. Many skin conditions can be effectively treated with herbal soaps. These soaps also contain glycerine, which is not commonly found in commercial soaps.

Cucumber (Cucumis sativus) contributes intense hydration (~95% water), flavonoids, carotenoids, vitamin C, and phenolic acids (e.g., caffeic acid), conferring cooling, soothing, antioxidant, and mild astringent effects—ideal for sun-exposed, inflamed, or dehydrated skin.

Mint (Mentha spp.), via menthol, triggers cutaneous cold receptors and offers antibacterial and anti-inflammatory support with a refreshing sensorial profile.

Vitamin E (tocopherol) supplies lipid-phase antioxidant protection and supports barrier recovery.

Almond oil provides emolliency and essential fatty acids.

Glycerin enhances water retention in the stratum corneum, improving softness and resilience. Together, these actives create a 'summer-cooling' synergy that is gentle, functional, and increasingly preferred by eco-conscious consumers. [1–4,6–18]

Biological Profile of Key Ingredients :

Cucumber (Cucumis sativus L., Cucurbitaceae) : Biochemically rich in vitamin C, vitamin K, phenolics, flavonoids, lignans, cucurbitacins, and minerals, cucumber exhibits anti-inflammatory, antioxidant, hydrating, depigmenting (via tyrosinase inhibition), and wound-healing tendencies. Traditional and modern cosmetic uses highlight its role in reducing puffiness, soothing sunburns, and restoring elasticity. [2,3,8,15-18]

Mint (Mentha spp., Lamiaceae) : Mint’s menthol activates TRPM8 cold receptors, giving an immediate cooling sensation. It also exhibits antibacterial, antifungal, and anti-inflammatory activities and can tighten pores, making it suitable for oily and acne-prone summer skin. [6]

Vitamin E (Tocopherol) : A fat-soluble antioxidant, vitamin E neutralizes lipid peroxidation in cellular membranes, supports barrier integrity, and mitigates UV-induced oxidative damage—a critical protective  role in summer regimens. [2,15-18]

Almond Oil (Prunus amygdalus) : Rich in oleic and linoleic acids, phytosterols, and vitamin E, almond oil confers occlusive and emollient effects, helping soothe dry, irritated, or sun-damaged skin while enhancing soap glide and after-feel. [1,4,9-14]

Glycerin : A plant-derived humectant, glycerin attracts and retains water in the stratum corneum, reducing TEWL and enhancing softness without irritating sensitive skin, making it indispensable in summer-friendly herbal soaps. [4]

Objectives:

1.      Elucidate the dermatological value of cucumber, mint, vitamin E, almond oil, and glycerin in cooling, hydrating, and protecting skin during summer.]

2.      Compare herbal vs. synthetic soaps on skin compatibility, eco-friendliness, and long-term benefits, especially for sensitive and acne-prone skin.

3.      Critically appraise formulation methods (cold saponification, melt-and-pour, herbal infusion) that preserve bioactivity and sensorial quality.

4.      Map consumer and regulatory trends pushing toward chemical-free, biodegradable, and phytochemical-rich soaps.

5.      Propose future innovations (nano-encapsulation, UV-protective minerals, multifunctional exfoliation, green surfactants, sustainable packaging).

6.      Blend traditional herbal wisdom with modern cosmetic science to guide premium, evidence-based summer cool soap development.

MATERIALS AND METHODS:

Following established procedures in herbal soap literature, summer cool soap can be prepared by cold saponification or melt-and-pour methods, incorporating cucumber extract (juice or lyophilized), mint essential oil, vitamin E, almond oil, and glycerin into a plant oil–NaOH soap base. Actives are added at trace to minimize thermal degradation. Soaps are molded and cured (typically 3–4 weeks) for hardness, stability, and mildness. [1,2,4,9-18]

Method of Preparation :

Step 1: Collect of all ingredients.

Step 2: Prepare of Cucumber Extract.

Step 3 : Prepare of Mint Extract.

Step 4 : Melt Glycerine Soap base in double boiler

Step 5: After Melting of Glycerine Base Addition of Cucumber Extract and Mint Extract

Step 6: Add Vitamin E Capsule and Almond Oil after the addition of all ingredients add Rose Essence

Step 7: After addition of fragrance oil. Stir it and pour into the mold which is lubricated by Coconut Oil.

METHODS OF EVALUATION: [1,9-14]

1.      pH Measurement : Ten grams of the polyherbal soap were dissolved in one hundred milliliters of distilled water to create a 10% solution in order to measure the soap's pH. The pH of the solution was determined using a calibrated pH meter. After inserting the electrode into the solution, the pH value Q was noted.

2.      Color and Clarity : By setting the soap against a white background, the soap's color and clarity were visually assessed. The clarity and homogeneity of appearance were observed.

3.      Ability to generate Foam : In a 100 ml graduated measuring cylinder, 1 gram of soap was dissolved in 50 milliliters of distilled water to assess the ability to generate foam. After giving the solution a good shake for two to three minutes, it was left alone for ten minutes. A measurement was made of the foam's height. The average foam height was determined after this test was conducted three times.

4.      Foam Retention Time : This is the amount of time that the foam stays stable following formation. The time it took for the foam to go away was measured using the same foam generation process; this was usually seen for five to ten minutes.

5.      Saponification Value : This figure indicates how many milligrams of potassium hydroxide (KOH) are required to saponify one gram of fat or oil. Regarding this test:
• In a conical flask, two grams of soap sample and 0.5 M KOH were combined.
• The mixture was first heated to 55°C while being constantly stirred in a hot water bath.
• After that, the mixture was brought to a boil for around an hour at 100°C.
Following boiling, 0.5 M HCl was used for titration, and phenolphthalein was used as the indicator. The endpoint was recorded when the pink hue vanished.

The formula : Value of Saponification = Oil Weight (g) The average K OH × 28.056 volume

Key Evaluation Parameters for Summer Cool Soap :

FUTURE PROSPECTS :

1.      Delivery Science : Nano-encapsulation of cucumber polyphenols and vitamin E to improve stability, penetration, and antioxidant longevity. [2,6,15-18]

2.      Dual-Functionality : Incorporation of UV-protective minerals (zinc oxide/titanium dioxide) and mild natural exfoliants (oat, rice bran) to produce cleanse–protect–polish soaps. [2,15-18]

3.      Green Chemistry : Adoption of biodegradable surfactants, low-energy cold processes, and plastic-free, compostable packaging. [5,7]

4.      Microbiome-Friendly Soaps : Designing formulations that respect skin microbiota, avoiding harsh preservatives and surfactants. [5,7]

5.      Regulatory & Clinical Validation : Moving from lab-scale evaluations to controlled clinical trials, standardizing efficacy/safety benchmarks for herbal soaps. [1,2,7,9-18]

CONCLUSION :

Summer cool soaps, anchored by cucumber, mint, vitamin E, almond oil, and glycerin, deliver hydration, cooling, antioxidant protection, and gentle cleansing—all crucial for heat-stressed, UV-exposed, and sensitive skin. Their physicochemical robustness, sensory appeal, and biocompatibility—combined with sustainable, plant-based chemistry—position them as high-value, consumer-preferred alternatives to synthetic soaps. Strategic advances in delivery systems, eco-design, and clinical validation can elevate these formulations from niche herbal products to mainstream, multifunctional dermocosmetic solutions.

ACKNOWLEDGEMENT:

We would like to express my special gratitude to Dr. G. J. Khan, Principal, JIIU'S Ali Allana College of Pharmacy Akkalkuwa and Management of Jamia Islamia Ishaatul Uloom Akkalkuwa for their continuous motivation and providing all necessary facilities during completion of this work.

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