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why do lipids form an emulsion in the emulsion test?
lipids are insoluble in water but soluble in ethanol. when mixed with water, lipid droplets disperse, forming a white emulsion.
properties of lipids
non-polar
hydrophobic
made of CHO
insoluble in water but soluble in organic solvents e.g. alcohols
lipids as energy storage
lipids store twice as much energy per gram as carbs, making them an efficient energy store
lipids used for insulation
fat deposits under the skin provide thermal insulation in mammals (e.g. blubber in whales) which reduces heat loss
lipids for protection
lipids cushion vital organs, protecting them from physical damage
lipids used for waterproofing
waxes and oils prevent water loss in plants and animals (e.g. cuticle on leaves, sebum on skin)
lipids in membrane structure
phospholipids form biological membranes, controlling substance transport into and out of cells