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이기영,이용복,김형주,이창문 한국생물공학회 2005 Biotechnology and Bioprocess Engineering Vol.10 No.6
Drug delivery to the lymphatic system may be important in terms of the treatment with lymphatic in-volvement, such as tumor metastases and immunization. Especially, drug transport via the intestinal lymphatics after oral administration has been attracted lots of interests. The purpose of this study was to prepare cyclosporin A (CSA)-loaded liposomes, with different characteristics, and evaluate their mucoadhesivity. Three liposome preparations were formulated: cationic stearylamine liposomes (SA-Lip), anionic phosphatidylserine liposomes (PS-Lip), polymer (chitosan)-coated liposomes (CS-Lip), and char-acterized. The liposome preparations were found to be spherical in shape, with PS-Lip being the smallest. The liposome preparations exhibited entrapment efficiencies in the order: PS-Lip (52.5 ± 2.9%) > SA-Lip (48.8 ± 3.3%) > CS-Lip (41.7 ± 4.2%). Finally, mucoadhesive tests were carried out using rat intestine, with SA-Lip (67%) showing the best adhesive rate of the three preparations (PS-Lip: 56%, CS-Lip: 61%). These results suggest that a positive charge on the surface of drug carriers may be an important factor for the intestinal drug delivery.