AIM: To improve the absorption of thymopeptides(TH) by preparing sodium deoxycholate/phospholipid-mixed nanomicelles(SDC/PL-MMs). METHODS: TH-SDC/PL-MMs were prepared by a film dispersion method, and then evaluated using photon correlation spectroscopy(PCS), zeta potential measurement, as well as their physical stability after storage for several days. Furthermore, in situ intestinal single-pass perfusion experiments and pharmacodynamics in immunodeficient mice were performed to make a comparison with TH powders and the control drug in absorption properties. RESULTS: A narrow size distribution of nanomicelles, with a mean particle size of(149 ± 8.32) nm and a zeta potential of(-31.05 ± 2.52) mV, was obtained. The in situ intestine perfusion experiments demonstrated a significant advantage in absorption characteristics for TH compared to the other formulations, and oral administration of TH-SDC/PL-MMs potentiated an equivalent effect with i.h. TH in pharmacodynamic studies in immunodeficient mice. CONCLUSIONS: TH-SDC/PL-MMs prepared by a film dispersion method are able to improve the absorption of TH. SDC/PL-MMs might be a good approach for the more effective delivery of drugs like TH.
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