Formulation and Evalution of Cold Cream

Cold creams are semi-solid oil-in-water (O/W) emulsions widely used in cosmetic and dermatological formulations due to their moisturizing, cleansing, and protective properties. Traditionally composed of fats, waxes, and water, cold creams serve as emollients that hydrate the skin by preventing transepidermal water loss, particularly in cold or dry environments (Pillai et al., 2010). Their application is especially beneficial in restoring the lipid barrier function of the skin, making them popular in personal care and therapeutic formulations. The formulation of an effective cold cream involves the careful selection of excipients such as emulsifying agents (e.g., borax), emollients (e.g., mineral oil, lanolin), and stabilizers to ensure product consistency, stability, and efficacy. The quality and performance of a topical cream depend significantly on physicochemical parameters like pH, viscosity, spreadability, and microbial stability, all of which influence user acceptability and safety (Barel et al., 2014). With increasing consumer preference for multifunctional and dermatologically safe cosmetics, it is essential to evaluate the formulated product not only for its aesthetic properties but also for its therapeutic potential and skin compatibility. Thus, this study aims to develop a stable cold cream formulation using the fusion method and to evaluate its physicochemical characteristics and dermatological safety.

Profile of Formulation Ingredients⁴:

• Liquid Paraffin
  • Quantity: 50 g (for 100 g), 12.5 g (for 25 g)
  • Role: Acts as an emollient and moisturizer; forms a protective barrier on the skin to prevent moisture loss.
• Beeswax
  • Quantity: 16 g (for 100 g), 4 g (for 25 g)
  • Role: Functions as a thickening agent; provides structure and consistency to the cream.
• Borax
  • Quantity: 0.8 g (for 100 g), 0.2 g (for 25 g)
  • Role: Serves as an emulsifying agent; helps in stabilizing the oil and water phases.
• Methyl Paraben
  • Quantity: 0.18 g (for 100 g), 0.045 g (for 25 g)
  • Role: Preservative; prevents microbial growth and enhances product shelf life.
• Propyl Paraben
  • Quantity: 0.02 g (for 100 g), 0.005 g (for 25 g)
  • Role: Provides antimicrobial activity; works synergistically with methyl paraben for preservation.
• Rose Water
  • Quantity: q.s (quantum satis/as required)
  • Role: Used as a fragrance; gives a pleasant aroma to the cream.
• Purified Water
  • Quantity: 33 g (for 100 g), 8.25 g (for 25 g)
  • Role: Forms the aqueous phase; hydrates the skin and aids in emulsification.

Experimental Work:

A) Diclofenac Sodium Gel:

1. Materials Required

2. Method of Preparation (Fusion Method)

1. Oil Phase Preparation:
   • Weigh and melt beeswax and liquid paraffin in a beaker using a water bath (~70–75°C).
   • Add methyl paraben and propyl paraben to this oil phase and stir until completely dissolved.
2. Aqueous Phase Preparation:
   • In a separate beaker, dissolve borax in purified water and heat it to the same temperature (~70–75°C).
   • Add rose water in sufficient quantity (q.s) for fragrance.
3. Emulsion Formation:
   • Slowly add the hot aqueous phase to the oil phase with continuous stirring.
   • Continue stirring until a uniform emulsion forms.
   • Allow the cream to cool gradually at room temperature with gentle stirring to avoid air entrapment.
4. Final Product:
   • Transfer the cooled cream into a suitable container and label.

3. Evaluation Parameters

a. Physical Appearance

• Checked visually for color, consistency, and homogeneity.

b. pH Measuremen

Fig No – 1 (pH meter)

• 1 g of cream was dispersed in 10 mL distilled water and measured using a calibrated digital pH meter.
• 6.5 is the pH of formulation of cold cream

c. Spreadability