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introduction and concept. development of stg key features of stg importance of stg sterols phospholipids glycolipids fixed oil vs fats classification of lipids beeswax mustard oil peanut oil linseed oil olive oil castor oil pharmaceutical application uses chemistry lipids and oil definition uses of mucilage sources of mucilage uses of gums sources of gums sodium alginate agar gums mucilages gums vs mucilage sterculia tragacanth