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- W2003069632 abstract "Purpose: The aims of this experimental work were the incorporation and full characterization of the system Tretinoin-in-dimethyl-beta-cyclodextrin-in-ultradeformable vesicles (Tretinoin-CyD-UDV) and Tretinoin-in-ultradeformable vesicles (Tretinoin-UDV).Methods: The Tretinoin-CyD complex was prepared by kneading and the UDV by adding soybean phosphatidylcholine (SPC) to Tween® 80 followed by an appropriate volume of sodium phosphate buffer solution to make a 10%–20% lipid suspension. The resulting suspension was brought to the final mean vesicles size, of approximately 150 nm, by sequential filtration. The physicochemical characterization was based on: the evaluation of mean particle size and polydispersity index (PI) measured by photon correlation spectroscopy (PCS) and atomic force microscopy (AFM) topographic imaging; zeta potential (ζ-potential) and the SPC concentration determined by Laser–Doppler anemometry and an enzymatic-colorimetric test, respectively. The quantification of the incorporated Tretinoin and its chemical stability (during preparation and storage) was assayed by a HPLC at 342 nm.Results: It was possible to obtain the system Tretinoin-CyD-UDV. The mean vesicle size was the most stable parameter during experiments time course. AFM showed that Tretinoin-CyD-UDV samples were very heterogeneous in size, having three distinct subpopulations, while Tretinoin-UDV samples had only one homogeneous size population. The results of the ζ-potential measurements have shown that vesicle surface charge was low, as expected, presenting negative values. The incorporation efficiency was high, and no significant differences between Tretinoin-CyD-UDV and Tretinoin-UDV were observed. However, only Tretinoin-UDV with 20% lipid concentration formulation remained chemically stable during the evaluation period.Conclusion: According to our results, Tretinoin-UDV with 20% lipid concentration seems to be a better approach than Tretinoin-CyD-UDV, attending to the higher chemical stability." @default.
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- W2003069632 date "2013-04-30" @default.
- W2003069632 modified "2023-10-17" @default.
- W2003069632 title "Novel tretinoin formulations: a drug-in-cyclodextrin-in-liposome approach" @default.
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- W2003069632 doi "https://doi.org/10.3109/08982104.2013.788026" @default.
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