EXPERIMENT : Isolation of Caffeine from Coffee One of the procedure : Extract the coffee three times with 20-25 mL portions of dichloromethane. Wash the combined organic layers twice with 20 mL of 6M NaOH, and once with 20 mL of tap water. Why the dichloromethane solution was washed with strong base?

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Micelles and Biological Membrane

Micelles are the type of lipid molecules that organize themselves in spherical shape in aqueous solutions. The production of the micelle is a reply to the amphipathic behavior of fatty acids. It means that they consist of both hydrophobic regions and hydrophilic regions. In micelles, polar head groups (hydrophilic groups) produce an outer layer associated with water whereas nonpolar tails (hydrophobic groups) are organized in the interior.