Desenvolvimento de scalffolds de quitosana para dosagem em analitos.

Abstract

The quantification of substances in human samples has great importance for the diagnosis, monitoring and treatment for several situations that affect health and physiological conditions of the population. Among the analytes to be quantified, you have cyclosporine that is administered in transplanted patients for immunosuppressive treatment. The drug quantification are currently done by complex and expansive devices and is an important source of costs on public health as Brazil has the Highest Attendance Transplant System of the World and subsidizes 95 % of the treatment , including surgical procedures , medication and monitoring needed in post- transplant. Now a days, simple devices that do not require instruments and laboratory facilities are being used for various types of diagnoses. They are called rapid tests that use immunochromatography, as methodology. The study had the scope to develop a material with chitosan films to carry similar substances human blood and compare this capacity to the nitrocellulose with the goal of establishing a possible replacement of nitrocellulose for chitosan in the productions of a rapid test device, enabling a new field of application for chitosan as a carrier material. The scalffolds had been developed by the preparation of a chitosan 1% solution which was filtered, frozen and lyophilized. The scalffolds were then neutralized, washed, dried and lyophilized again. The strips of nitrocellulose registered with Anvisa were obtained in pharmacy, so samples were selected randomly to be performed the same characterizations performed in scalffolds. The characterization was performed using spectroscopy techniques in the Fourier Transform Infrared Region (FTIR), Scanning Electron Microscopy (SEM) /Energy Dispersive Spectroscopy X-ray (EDS), Wettability and Swelling. The infrared spectra showed that the nitrocellulose and chitosan have functional groups compatible with the features described in the literature. The micrographs and spectra showed a composition compatible for characteristics of absorption and liquid carrying due to the presence of polarity. The wettability tests have shown that the nitrocellulose and chitosan have high hydrophilicity and swelling measurements showed a high degree of nitrocellulose and chitosan swelling and its supporting carrier material characteristics. The product developed has the potential feasibility for use as carrier material in diagnostic devices.