설명(영) |
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The materials in this group are generally plant-derived materials which belong to the chemical class of Carbohydrates. Although chemically diverse, the unique ability of gums to swell in the presence of water and to increase the viscosity of aqueous preparations accounts for this special class. The viscosity developed by hydrophilic colloids depends on their molecular weight and the presence of various cations which may neutralize some acid functions of these carbohydrate molecules or cause some cross linking.
In cosmetics, gums and the like are used to impart viscosity to all types of products. They act as suspending or gelling agents and emulsion stabilizers. Some of these gums have unique textural qualities which make them useful in water-based lubricants. |