The dry gum or Continental method requires that you place the acacia in a dry mortar and add the oil. Mix for a very brief time. Now add the water all at once and mix until the primary emulsion is formed. The wet gum or English method requires that you make a mucilage with the acacia and water.
What is wet gum method of emulsion?
The 1 part gum is triturated with 2 parts water to form a mucilage; then the 4 parts oil is added slowly, in portions, while triturating. After all the oil is added, the mixture is triturated for several minutes to form the primary emulsion.
What is wet gum method used for?
This method is employed for preparing emulsions containing volatile and other non-viscous oils. Both dry gum and wet gum methods can be employed for the preparation. As volatile oils have a low viscosity as compared to fixed oils, they require comparatively large quantity of gum for emulsification.
What is type of emulsion meant for oral use?
British Pharmacopoeia (BP) definition (oral emulsions) Oral emulsions are oral liquids containing one or more active ingredients. They are stabilized oil-in-water dispersions, either or both phases of which may contain dissolved solids. Solids may also be suspended in oral emulsions.
What is another name for dry gum method?
The continental method is used to prepare the initial or primary emulsion from oil, water, and a hydrocolloid or “gum” type emulsifier (usually acacia).
What is bottle method?
This method is a variation of the dry gum method. One part powdered acacia (or other gum) is placed in a dry bottle and four parts oil are added. The bottle is capped and thoroughly shaken. To this, the required volume of water is added all at once, and the mixture is shaken thoroughly until the primary emulsion forms.
How do you prepare an emulsion?
An emulsion is prepared by shaking strongly the mixture of the two liquids or by passing the mixture through a colloid mill known as the homogenizer. The emulsions thus prepared from the pure liquids are usually not stable and the two liquids separate out on standing.
What does primary emulsion mean?
The primary emulsion, or emulsion nucleus, is formed from 4 parts oil, 2 parts water, and 1 part emulsifier. The 4 parts oil and 1 part emulsifier represent their total amounts for the final emulsion. Oil soluble substance, in small amounts, may be incorporated directly into the primary emulsion.
What is the Continental method for dry gum?
Continental (Dry Gum, or 4:2:1) Method. The continental method is used to prepare the initial or primary emulsion from oil, water, and a hydrocolloid or “gum” type emulsifier (usually acacia).
What’s the best way to prepare dry gum?
Dry gum method: 1 Transfer accurately weighed quantities of gum into cleaned, dried mortar and triturate to get fine powder. 2 To this add slowly measured volume of oil through the walls of the mortar and mix well. 3 Then add measured volume of aqueous phase at once, at the center, start triturate vigarousely in one direction untill… More …
How is the primary emulsion of dry gum formed?
The primary emulsion, or emulsion nucleus, is formed from 4 parts oil, 2 parts water, and 1 part emulsifier. The 4 parts oil and 1 part emulsifier represent their total amounts for the final emulsion. In a mortar, the 1 part gum is levigated with the 4 parts oil until the powder is thoroughly wetted; then the 2 parts water are added all at once,…
When do you add oil to wet gum?
The 1 part gum is triturated with 2 parts water to form a mucilage; then the 4 parts oil is added slowly, in portions, while triturating. After all the oil is added, the mixture is triturated for several minutes to form the primary emulsion. Then other ingredients may be added as in the continental method.
