Oral drug administration often causes the loss of the drug's availability, to circumvent this problem, one alternative is to direct the drug to the desired target using polymeric systems that helps in its absorption.In the case of bowel inflammation (ulcerative colitis and Crohn's disease) this is quite evident since the ingested drug must pass through the gastrointestinal tract to reach the target, so the controlled drug delivery system is necessary.The polymeric system used in the controlled drug delivery system should preferably be insoluble in the acid stomach's pH (in case of Colon Targeted), should be soluble in the target region and should also be biodegradable.This project aims at the formation of a controlled drug delivery system of anti-inflammatory drugs for the colonic region. Chitosan will be the polymeric matrix to be used because of its abundance, low cost and the fact of being biodegradable in the colon region. Anti-inflammatory compounds that will be used are, nonsteroidal anti-inflammatory drugs (NSAIDs), commercial or that have been commercialized, and also compounds synthesized by Prof. Paulo Olivato of the Institute of Chemistry of the University of São Paulo, that have shown anti-inflammatory activity. The characterization of these systems will be performed using X-ray powder diffraction. Tests of solubility at different pH values that simulate the body's location drug release will be carried out and finally, in order to get an insight to understand the drug binding mode of the compounds to chitosan, docking calculations will be performed.
News published in Agência FAPESP Newsletter about the scholarship:
RAMALHO, SUELEM D.; DE SOUSA, LORENA R. F.; NEBO, LILIANE; MAGANHI, STELLA H.; CARACELLI, IGNEZ; ZUKERMAN-SCHPECTOR, JULIO; LIMA, MARIA INES S.; ALVES, MARCIO F. M.; DA SILVA, M. FATIMA DAS G. F.; FERNANDES, JOAO B.; et al. Triterpenoids as Novel Natural Inhibitors of Human Cathepsin L. CHEMISTRY & BIODIVERSITY, v. 11, n. 9, p. 1354-1363, SEP 2014. (12/22524-9)