Nandkumar Shinde College of Pharmacy, Aghur Tq. Vaijapur, Dist., Chh. Sambhajinagar.
This study presents the formulation and development of a transparent bathing bar incorporating natural extract of butterfly pea (clitiria ternatea) flower extract and lemongrass (cymbopogon citratus) essential oil. The primary aim is to create a natural, aesthetically appealing, and skin-friendly bathing product with added antioxidant, anti-inflammatory, and antimicrobial benefits. Butterfly pea flower is rich in anthocyanins, known for their antioxidant and skin-soothing properties, while lemongrass essential oil contributes antimicrobial action and a refreshing citrus aroma. The transparent base was prepared using natural glycerin, ensuring skin hydration and clarity of the final product. The formulation was evaluated for physicochemical properties such as pH, hardness, lathering, and transparency. The resulting bathing bar demonstrated good stability, appealing visual characteristics, and enhanced sensory and functional properties, making it a promising additional to the herbal cosmetic market.
Soap is a commonly used product that serves numerous functions. Due to the wide range of personal needs and customer preferences, soap products have become quite diverse, including opaque soap, liquid soap, and transparent soap. Opaque soap is a type of regular soap that is solid and not see-through, while liquid soap is in a liquid form. Typically, transparent soap is more costly than other soaps and is generally favored by the upper middle class. Soaps of high quality are influenced by the raw materials used. The primary ingredient for soap production is fats or oils derived from plants and animals. In this study, coconut oil was the oil selected. Coconut oil is easily identified. [1] For centuries, soap has been utilized and remains a popular choice as a cleansing agent, a mild antiseptic, and an ingestible remedy for certain types of poisoning. The production of soap occurs through a straightforward process known as saponification, which happens when a fatty acid interacts with an alkali. The oils and fats utilized in soap production consist of triglycerides. A triglyceride is a compound composed of three fatty acid molecules linked to a single glycerol molecule. The other significant element of soap, lye, is an alkali, or a base (the contrary of an acid, on the pH scale).[2]
Types of Soaps Based on Usage [1]
• Toilet Soaps
• Syndet soaps
• Glycerin Soaps
• Transparent Soaps
Characteristics of soap[2]:
Transparent soap:
Transparent soap is a clear type of soap that contains a lot of glycerin. Commonly known as “glycerin soap,” Glycerin acts as a humectant, meaning it draws in moisture. This characteristic of glycerin soap is what renders it more hydrating than opaque soaps with lower glycerin content. Transparent soap is so mild that it is frequently advised for individuals with extremely sensitive skin, including infants, young children, and those with allergies or dermatitis. Soap that contains a high level of glycerin rinses more effectively readily from the skin and does not leave a residue that may lead to irritation. Furthermore, Glycerin soap is usually more affordable than other moisturizing or anti-aging beauty bars. [1]
Table No. 1 Idea Range of Good Soap Bar
Hardness |
29 to 54 |
Cleansing |
12 to 22 |
Condition |
44 to 69 |
Bubbly lather |
14 to 46 |
Creamy lather |
16 to 48 |
MATERIAL AND METHOD:
1.1 MATERIAL:
Transparent soaps possess an unclear and luminous surface that feels extremely gentle and silky on the epidermis. The visual aspects and presentation of the Transparent soap gives it a luxurious and rich appearance, unlike other common soaps. Clear glycerin soaps are adaptable and readily adjustable since you can utilize various scents, tinted pigments, vital oils, and so on. Clear soap is essentially a hot process. soap that incorporates solvents (sugar, glycerin, and alcohol) to dissolve the soap crystals that develop permitting light to flow, thus producing clarity. When producing a clear soap recall, select a minimum of 75% solid fats (coconut oil, palm oil, beef fat, pig fat, stearic acid. [1]
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<img alt="Glycerin Bathing Bar Base.png" height="150" src="https://www.ijpsjournal.com/uploads/createUrl/createUrl-20250602133422-7.png" width="150">
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Fig no.1 Glycerin Bathing Bar Base
Lemongrass (Cymbopogon Citrateus) is a component of plants many times in regular medicine and traditional Citronelle essential oil (climbing), large goods obtained from the factory and fclectal activity. In addition, Leo is a common substance used in the production of pharmaceutical products such as antifungal drugs, antidepressants and nausea cure. . It is an individual's fragrant and attractive aroma plants,and it is used in a type of adornment technology (such as perfume, perfume and generally detergent) like although bread (for example, tea, spice of coacker).[3]
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<img alt="Lemongrass essential oil.png" height="150" src="https://www.ijpsjournal.com/uploads/createUrl/createUrl-20250602133422-6.png" width="150">
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Fig no. 2 Lemongrass essential oil
Kingdom- Plantae
Order- Poales
Family- Poaceae
Subfamily- Panicoideae
Lemongrass includes about 180 species, such as Cymbopogon Citratus, Cymbopogon Flexuosus, Cymbopogon Winterrianus, Cymbopogon Martinii, Cymbopogon Nardus and Cymbopogon refractive.[4]
Synonyms: Serai, West Indian LemonGrass, Oil Grass, Fever Grass, Serai Makan, Lemongrass[3]
Geographical source: Lemongrass is planted and distributed in sub -regions of Africa, Asia, North America, South America, Australia, Oceania.[5]
Chemical composition[6]:
Citronella essential oil is a complex blend of compounds, with citronellal as its primary component, contributing to its characteristic lemon aroma and insect-repellent properties. The oil also contains geraniol and citronellol, both alcohols that enhance its fragrance profile. Other significant constituents include limonene, a monoterpene with a citrus scent, and various minor compounds such as 3-methylcyclohexanol, eucalyptol (1,8-cineole), carotol, globulol, linalool, hinesol, borneol, citronellyl acetate, and citronellyl isobutyrate.
Therapeutic uses: Larvicidal, insecticidal, miticidal, ovicidal, acaricidal, analgesic, aesthetic, anti-inflammatory, antioxidant, antinociceptive, antihypertensive, anti-obesity, anxiolytic, antimutagenicity potential, cardioprotective, antirheumatic, and haematological properties are all possessed by lemongrass oil and extract.[4].
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<img alt="Pharmacological action of Lemongrass oil.png" height="150" src="https://www.ijpsjournal.com/uploads/createUrl/createUrl-20250602133422-5.png" width="150">
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Fig no. 3 Pharmacological action of Lemongrass oil
Application[5]:
1. Cosmetic use: Formulations for soaps, detergents, and cosmetics contain lemongrass oil.
2. Food and drinks: Foods like spices, tea leaves, baked goods, confections, and meat and meat products have all been flavored with lemongrass oil.
3. Industrial use: Lemongrass oil is used as an additive ingredient in a variety of products, including as deodorant, candles, polish, waxes, insect and mosquito repellent cream, pesticides, antifungal cream, and fragrances, because of its appealing scent.
4. Agricultural use: There are applications for the oils of several lemongrass species in the manufacturing of bactericides and germicides.
C. Butterfly Pea Flower Extract:
Clitoria ternatea L., often known as the butterfly pea, belongs to the Fabaceae family. A well-known Ayurvedic remedy for a number of illnesses is Clitoria ternatea. Butterfly Pea blossoms are blue in shade. This suggests that anthocyanins are present. It can be used to color food or other objects, depending on the use. One of the plants whose entire body benefits from all of its parts is the butterfly pea (Clitoria ternatea L.).
Synonyms: Clitoria albiflora Mattei, Clitoria bracteata Poir. Clitoria mearnsii De Wild., Clitoria tanganicensis Micheli, Clitoria zanzibarensis Vatke.
Biological source : It consist of dried seeds of plant perennial herbaceous belonging into family fabaceae.
Family: Fabaceae.
Genus: Clitoria L.
Species: Clitoria ternatea.
Chemical composition: Clitoria ternatea (CT) contains various bioactive compounds. Its roots have flavonol glycosides, triterpenoids, and sugars like O-β-d-galactopyranosyl-O-β-d-glucopyranoside. Seeds contain proteins, fatty acids, finotin (an antibacterial protein), and flavonoids. Flowers are rich in ternatins and kaempferol derivatives.[8]
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<img alt="Butterfly Pea Flower.png" height="150" src="https://www.ijpsjournal.com/uploads/createUrl/createUrl-20250602133422-4.png" width="150">
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Fig No. 4 Butterfly Pea Flower
Therapeutic Uses:
D. Coconut Oil:-
Biological name: Cocos nucifera. Order: Arecales
Family: Arecaceae
Sub- family: Arecoideae
Genus: Cocos L.
Species: Nucifera
Uses of coconut oil: Skin Condition left behind, helping them fade more quickly while keeping skin moisturized to allow quicker healing. Sunburn Relief Coconut oil can help soothe inflamed skin, reduce redness and rehydrate skin. Coconut oil contains a series of fatty acids that nourish and immunize your skin. [1]
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<img alt="Coconut Oil.png" height="150" src="https://www.ijpsjournal.com/uploads/createUrl/createUrl-20250602133422-3.png" width="150">
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Fig No. 5 Coconut Oil
Propylene glycol is a viscous, colorless liquid, which is nearly odorless but possesses a faintly sweet taste. Its chemical formula is CH? CHCH? OH. Containing two alcohol groups, it is classed as a diol. It is miscible with a broad range of solvents, including water, acetone, and chloroform.
? Density: 1.04 g/cm³
? Formula: C3H8O2
? Boiling point: 188.2 °C
? Molar mass: 76.09 g/mol
? Iupac name: propane-1,2-diol
? Melting point: -59 °C
Use of propylene glycol: Due to its strong affinity for water, glycol is frequently added in trace amounts to enhance the moisturizing properties of skin care products, according to Zeichner. For more supple, moisturized skin, humectants draw and hold water in the skin. Propylene glycol is frequently utilized in moisturizing compositions for this reason.[1]
1.2 METHODOLOGY:
1.2.1 Formulation table:
Table No.2
Sr. no. |
Ingredients |
Quantity taken |
Roles |
1. |
Glycerine soap base |
85g (Q.S) |
Main base |
2. |
Butterfly pea flower extract |
2ml |
Antioxidant |
3. |
Lemongrass essential oil |
1ml |
Antimicrobial |
4. |
Coconut oil |
5ml |
Moisturizer |
5. |
Ethanol (99%) |
5ml |
Transparency enhancer |
6. |
Propylene glycol |
2ml |
Humectant |
1.2.2 Procedure:
1. Take a handful of dried butterfly pea flower and steep them in distilled water for 15 minutes.
2. Cut the glycerine soap base into small cubes and melt them using double boiler.
3. Once the soap base fully melted, slowly pour butterfly pea flower infusion.
4. Add lemongrass essential oil and stir thoroughly to distribute the fragrance evenly.
5. Add coconut oil for extra moisturizing properties.
6. To prevent bubble forming on the surface, lightly spray soap mold with ethanol.
7. Pour the melted soap mixture into mold and lightly spray ethanol on top of soap to remove bubbles.
8. Let the soap cool and harden at room temperature.
9. Once the soap is cooled and hardened, gently remove it from mold.
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<img alt="Transparent Soap.png" height="150" src="https://www.ijpsjournal.com/uploads/createUrl/createUrl-20250602133422-2.png" width="150">
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Fig No. 6 Transparent Soap
1.2.3 Evaluation Study:
A. Physical Evaluation:
It refers to the evaluation of the transparent bathing bar by its colour, odour, appearance and texture.
The pH of a formulation of transparent bathing bar was measured with a pH meter. 10grams of transparent bathing bar were put into a 150 ml beaker. Add 10 ml of hot and cooled water. Stir vigorously to form a suspension.
25ml of the one percent soap solution was taken into 100ml graduate measuring cylinder the cylinder was covered with hand and shaken 10 times. the volume of foam at 1 minute interval for 4 minutes was recorded.it was found to be 5 minutes.
D. Determination of Foam Height:250mm
E. High temperature stability:
The soap was allowed to stand at temperature above 50 c
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<img alt="Foam Height.png" height="150" src="https://www.ijpsjournal.com/uploads/createUrl/createUrl-20250602133422-1.png" width="150">
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Fig No. 7 Foam Height
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Fig No. 8 Foaming Test
To assess the smoothness of a bathing bar, hold it under running water at 30°C and gently rub both sides on your palm for 3 minutes. During this process, the bar should not feel gritty or rough. After rubbing, examine the bar's surface; it should feel smooth when touched with fingers. Allow the bar to air dry at room temperature for 24 hours, then re-examine its surface. If no roughness or grittiness is detected, the bar passes the smoothness test.[14]
To evaluate tablet cracking, select a minimum of 10 samples. Submerge each tablet in a pool of distilled water maintained at 27 ± 2°C. Rotate each tablet 50 times between the palms, then allow them to dry in a humidity chamber at 38°C and 70% relative humidity for 24 hours. After drying, inspect the lateral surfaces of each tablet for cracks. Measure the total length of cracks that are 10 mm or longer using a scale. Calculate the average cracking score by dividing the total crack length by the number of tablets tested. This procedure assesses the tablet's resistance to cracking under specified conditions.[14] Average cracking score = Total length of cracks in mm / Total number of tablets.
RESULT AND DISCUSSION:
Sr.No |
Test |
Observation |
1. |
Colour |
Transparent Sky blue Colour |
2. |
Odour |
Characteristics |
3. |
Foam Height |
250mm |
4. |
Shape |
Oval |
5. |
High Temperature Stability |
Stable and no colour change at 45? |
6. |
Skin Irritation Test |
No irritation to skin |
7. |
Determination of grittiness |
No grittiness found |
8. |
Determination of cracking |
Zero |
CONCLUSION:
The development of a transparent bathing bar incorporating butterfly pea flower extract and lemongrass essential oil successfully demonstrates a natural, skin-friendly alternative to synthetic soap formulations. the butterfly pea flower, rich in antioxidant and anthocyanins, provides soothing and anti-anging properties, while lemongrass essential oil offers antibaterial, antifungal, and refreshing aromatherapeutic benefits. the final product exhibited good transparency, lathering ability, and a pleasant natural fragrance. overall, this herbal bathing bar holds promise for consumers seeking mild, effective, and environmentally friendly personal care solutions.
REFERENCES
Chavan K. S, Baswekar A. G.*, Dusane G. V, Mohan R. S., Lemongrass & Butterfly Pea Flower Transparent Bathing Bar: A Refreshing Skincare Solution, Int. J. of Pharm. Sci., 2025, Vol 3, Issue 6, 175-184. https://doi.org/10.5281/zenodo.15573981