While
ursolic acid (UA), one of the most broadly known
triterpene compounds, has proved to be effective in
cancer therapy, the applications of UA is limited due to its poor aqueous solubility and low bioavailability. The aim of our study was to prolong circulation time and enhance uptake of
liposomes in
tumor tissues through the modification of UA
liposomes via water-soluble
polyethylene glycol (PEG). In addition, this research also focuses on physicochemical properties of the
liposome formulations, including encapsulation efficiency, particle morphology, size, stability, release rate in vitro and cytotoxicity test. The obtained
liposomes were spherical particles with mean particle diameters around 100-200 nm. And the Fourier transform infrared spectroscopy (FTIR) indicated that PEG had been anchored successfully to the
liposomes. Based on our experimental data achieved, PEG-modified UA
liposomes possessed higher stability than conventional
liposomes, and the release rate of UA from PEG-modified
liposomes was slower when compared with those of UA
solution and conventional
liposomes. Meanwhile, the liposomal UA showed relatively low cytotoxic effect than UA conventional
liposomes within 24h, which was consistent with their release rates.