Axispharm offers you high-purity DSPE-SPDP, a phospholipid molecule that forms a lipid bilayer in water. The SPDP moiety reacts with thiol molecules to form disulfide bonds. The hydrophobic tails will face inwards, while the hydrophilic heads face outwards and interact with water.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.