Synthesis of functional phospholipids and preparation of shear-stress sensitive liposomes

This study aims to synthesize new phospholipids, 1,3-dipalmaminophospholipid(Pad-PC-Pad), and prepare shear-stress sensitive liposomes(SSSL). ¹H NMR and MS indicated that Pad-PC-Pad were fully synthesized successfully. SSSL were prepared by filming-rehydration method with Pad-PC-Pad, which loaded calcein with aggregation-caused quenching(ACQ)characteristics to evaluate shear-stress sensitivity of liposomes and release behavior of liposomes in vitro. The results showed that the particle size of liposomes was 106.91 ± 1.24 nm and liposomes had lenticular morphology under transmission electron microscope. The release of calcein was increased with ultrasonic power, which suggests that the liposomes is shear-stress sensitive. Moreover, the liposomes exhibited a releasing effect for obstructed region under high shear-stress in a model system. Therefore, we synthesized quick functional phospholipid Pad-PC-Pad and the liposomes made from Pad-PC-Pad was shear-stress sensitive, which may be used for treatment of thrombosis.