RESUMO
BACKGROUND: Bladder cancer is the second type of malignant carcinoma of the urinary tract. The treatment is time-consuming and requires maintenance doses of the drug for long period of time with important side effects. Curcumin has shown evident clinical advances in the treatment of cancer. The technology of microencapsulation and the use of mucoadhesive materials can contribute to modify the delivery and improve the bioavailability of curcumin. OBJECTIVE: The aim of this study was to design and characterize mucoadhesive microparticles containing curcumin using multivariate analysis and the spray-drying technique. METHODS: A factorial design 32+1 was employed to investigate the influence of gelatin, ethylcellulose, and curcumin on size, polydispersity index, drug content and entrapment efficiency. Microparticles were also evaluated by ATR-FTIR, X-ray diffraction, antioxidant activity, in-vitro release profile, exvivo mucoadhesion performance, and in-vitro cytotoxicity. RESULTS: Microparticles showed non-uniform surface, mean diameter from 2.73 µm to 4.62 µm and polydispersity index from 0.72 to 1.09, according to the different combinations of the independent factors. These independent variables also had a significant effect on the drug content. The highest values of drug trapping efficiency were obtained with the highest concentration of curcumin and polymers. Formulations displayed slow drug release and important antioxidant activity. The good mucoadhesive performance of microparticles was assessed by the falling film technique. Moreover, the formulations did not display in vitro toxicity against Artemia salina and Fibroblasts LM(TK). CONCLUSION: The design results were useful for developing of curcumin dosage form with good physicochemical characteristics and mucoadhesive properties for the bladder administration.
Assuntos
Antioxidantes/administração & dosagem , Celulose/análogos & derivados , Curcumina/administração & dosagem , Portadores de Fármacos/administração & dosagem , Gelatina/administração & dosagem , Microesferas , Nanopartículas/administração & dosagem , Adesividade , Animais , Antioxidantes/química , Artemia/efeitos dos fármacos , Benzotiazóis/química , Sobrevivência Celular/efeitos dos fármacos , Celulose/administração & dosagem , Celulose/química , Curcumina/química , Portadores de Fármacos/química , Desenho de Fármacos , Liberação Controlada de Fármacos , Fibroblastos/efeitos dos fármacos , Gelatina/química , Mucosa/química , Nanopartículas/química , Ácidos Sulfônicos/química , Suínos , Bexiga Urinária/metabolismoRESUMO
The objective of this study was to perform a structural characterization and evaluate the in vitro safety profile and in vitro antioxidant activity of liquid crystalline systems (LCS) with and without retinyl palmitate (RP). LCS containing polyether functional siloxane (PFS) as a surfactant, silicon glycol copolymer (SGC) as oil phase, and water in the ratios 30 : 25 : 45 and 40 : 50 : 10 with (OLS(v) = RP-loaded opaque liquid system and TLS(v) = RP-loaded transparent liquid system, respectively) and without (OLS and TLS, respectively) RP were studied. Samples were characterized using polarized light microscopy (PLM) and rheology analysis. In vitro safety profile was evaluated using red cell hemolysis and in vitro cytotoxicity assays. In vitro antioxidant activity was performed by the DPPH method. PLM analysis showed the presence of lamellar LCS just to TLS. Regardless of the presence of RP, the rheological studies showed the pseudoplastic behavior of the formulations. The results showed that the incorporation of RP in LCS improved the safety profile of the drug. In vitro antioxidant activity suggests that LCS presented a higher capacity to maintain the antioxidant activity of RP. PFS-based systems may be a promising platform for RP topical application for the treatment of skin aging.