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| Author(s): |
Cláudia Regina Gordijo
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) |
| Defense date: | 2007-10-04 |
| Examining board members: |
Denise de Oliveira Silva;
Wendel Andrade Alves;
Elizabeth Pinheiro Gomes Areas;
Marcos Augusto Bizeto;
Henrique Eisi Toma
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| Advisor: | Denise de Oliveira Silva |
| Abstract | |
Non-steroidal anti-inflammatory drugs are widely consumed to treat inflammatory diseases and pain but their clinical use are limited due to serious side-effects on the gastrointestinal tract. The bioactivity of metal complexes exhibits great interest in metal-based drug research. Cu(II)-NSAID compounds show good anti-inflammatory property and decreased side-effects compared to their organic parent drugs. This work aimed to contribute for development of alternative NSAIDs. Cu-NSAlD compounds containing the drugs Ibuprofen, Indomethacin, Naproxen, Sulindac and Meloxicam were synthesized and characterized. The compounds were also immobilized on Hydrotalcite, a layered double hydroxide (LDH) of magnesium and aluminum (Mg/Al = 3), that is biocompatible and used as stomach antacid. The interactions of the copper drugs with LDH led to Cu-NSAID/LDH- bioinorganic hybrid materiais. Two kinds of complex-LDH interactions were observed by changing the solvent: intercalation between LDH layers or adsorption on the LDH external surfaces. The intercalation of neutral complexes is favored in an alcohollamide solvent mixture where Hydrotalcite undergoes exfoliation process promoted by the amide hydrolysis. The stability of some complexes and their correspondent hybrid materials under gastric conditions (pH and temperature) and also in vivo anti-inflammatory, analgesic and ulcerogenic activities for Indomethacin (Indo)-containing systems were investigated. The stabilization of the Cu-Indo structure is promoted by intercalation of the complex into the LDH layers, contributing to increase its pharmacological activity. The bioinorganic hybrid materials here investigated also exhibit interesting properties for applications as controlled drug delivery systems. (AU) | |