期刊
INTERNATIONAL JOURNAL OF PHARMACEUTICS
卷 347, 期 1-2, 页码 144-148出版社
ELSEVIER
DOI: 10.1016/j.ijpharm.2007.06.045
关键词
nano-sized emulsion; transdermal; high shear processing; microfluidizer
The aim of this study was to compare the transdermal application of a nano-sized emulsion versus a micron-sized emulsion preparation of delta tocopherol as it relates to particle size and bioavailability. Two separate experiments were performed using seven FIB Syrian Golden hamsters, I week apart. Each emulsion preparation consisted of canola oil, polysorbate 80, deionized water and delta tocopherol; the only difference between the two preparations was processing the nano-sized emulsion with the Microfluidizer (R) Processor. Both were formulated into a cream and applied to the shaven dorsal area. The particle size of the micron-sized emulsion preparation was 2788 nm compared to 65 nm for the nano-sized emulsion formulation. Two hours post-application, hamsters that were applied the nano-sized emulsion had a 36-fold significant increase of plasma delta tocopherol, where as hamsters that were applied the micron-sized emulsion only had a 9-fold significant increase, compared to baseline, respectively. At 3 h post-application, plasma delta tocopherol had significantly increased 68-fold for hamsters applied the nano-sized emulsion, whereas only an 11-fold significant increase was observed in hamsters applied the micron-sized emulsion, compared to baseline, respectively. Significant differences were also observed between the nano-sized and micron-sized emulsion at 2 and 3 h post-application. This study suggests that nano-sized emulsions significantly increase the bioavailability of transdermally applied delta tocopherol. (C) 2007 Elsevier B.V. All rights reserved.
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