The study describes the development of stealth and non-stealth solid lipid
nanospheres (SLNs) as colloidal carriers for paclitaxel, a drug with very l
ow solubility. SLNs are constituted mainly of bioacceptable and biodegradab
le lipids, such as tripalmitin and phosphatidylcholine, and can incorporate
amounts of paclitaxel up to 2.8%. Stealth and non-stealth loaded SLNs are
in the nanometer size range and can be sterilized and freeze-dried. Thermal
analysis (differential scanning calorimetry) showed that paclitaxel is not
able to crystallize in the SLNs. Release of paclitaxel from SLNs is very l
ow. Non-stealth and stealth SLNs are stable over time without precipitation
of paclitaxel and can be proposed for its parenteral administration. (C) 2
000 Elsevier Science B.V. All rights reserved.