Hydrophobic polymer matrices offer insufficient adhesion for hydrophilic fibers. The renin molecule contains both hydrophobic and hydrophilic amino acids. A liposome can be hence loaded with hydrophobic and/or hydrophilic molecules. They are prepared from certain amphiphilic co-polymers consisting of both hydrophilic and hydrophobic monomer units. Generally proteins have a core of hydrophobic residues surrounded by a shell of hydrophilic residues. Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. Amphiphiles are molecules that have both hydrophobic and hydrophilic domains. This makes them amphiphilic molecules (having both hydrophobic and hydrophilic portions). Some modifications can produce hydrophobic lipoproteins, or hydrophilic glycoproteins. The proteins and lipids that make up the surfactant have both hydrophilic and hydrophobic regions. The biological membrane is made up of lipids with hydrophobic tails and hydrophilic heads. Cell membranes consist of hydrophilic and lipophilic endgroups. Surface sizing agents are amphiphilic molecules, having both hydrophilic (water-loving) and hydrophobic (water-repelling) ends. The extent of the hydrophobic and hydrophilic portions determines the extent of partitioning. This method resulted in a particle with equal hydrophilic and hydrophobic areas.