Licenciatura em Química (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/26
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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Resultados da Pesquisa
Item Uma breve revisão dos complexos transplatínicos na terapêutica oncológica(2023-03-24) Oliveira, Barbara Daminnicy Nogueira de; Belian, Mônica Freire; Lima, Lidiane Macêdo Alves de; http://lattes.cnpq.br/9825403406472930; http://lattes.cnpq.br/2626644337183959; http://lattes.cnpq.br/4821392524886127Drugs with potential antitumor activity are of great interest to the pharmaceutical industry, since cancer is one of the diseases that affect thousands of people around the world. Cisplatin is a platinum (2+) compound widely used in cancer chemotherapy, with excellent rates of tumor regression, however, the severe side effects and cross-resistance limit its use. Thus, cisplatin analogues compounds such as carboplatin, nedaplatin, and oxaliplatin have been developed and clinically approved. Despite this, patients who use such drugs for treatment may develop cross-resistance. In this context, the need arose to search for new complexes that make it possible to minimize side effects and cross-resistance. Among the new platinum (2+) compounds of interest with antitumor activity studied, there are complexes with trans isomerism, which, due to their different mechanisms of action when binding to nDNA nucleophiles present promising strategies to overcome the mentioned difficulties encountered by current drugs with cis isomerism. Therefore, research on antitumor activity in platinum (2+) complexes with trans isomerism is relevant, to which this work is intended. This study consists of a brief review of the literature, allowing to map examples of transplatin complexes that stand out for their cytotoxic properties, configuring them as promising antineoplastic agents.Item Estudos de pré-concentração de platina explorando materiais de sílica organofuncionalizados(2022-10-13) Sousa, Filipe Carvalho Pires de; Belian, Mônica Freire; Lavorante, André Fernando; http://lattes.cnpq.br/1011018535020717; http://lattes.cnpq.br/2626644337183959; http://lattes.cnpq.br/8810636055275824The present work aims to develop an organofunctionalized material through a silylation reaction, by a heterogeneous route, using the Stöber method, capable of effectively coordinating platinum íons (Pt4+). The synthesis of modified silica was carried out by the sol-gel process, where functionalization was carried out one pot through the addition of N´-[(trimethoxysilyl)propylethylenetriamine, tetraethylorthosilicate (TEOS) and ammonium hydroxide, the latter being a catalyst for hydrolysis and condensation reactions. The adsorptive/coordinative capacity of the organofunctionalized silica was evaluated through Fourier transform infrared (FTIR) and electronic absorption techniques. Through infrared spectroscopy, it was possible to observe the presence of bands referring to silanol groups (Si-OH) between 3470 and 3090 cm- 1, and an intense broad band related to siloxane groups (Si-O-Si) at 1029 cm-1. In addition, it was possible to identify bands at 2904 and 2829 cm-1 referring to the N-H groups of the amines present in the organofunctionalization of silica, coming from N´-[(trimethoxysilyl)propylethylenetriamide, as expected; and, at 1465 cm-1, the C-N band of amines is observed. Fourier transform Infrared spectroscopy (FITR) was used as a proposal to observe, through the spectra, the possible changes that occurred with the organofunctionalized compound after reacting with a 10-4 mol L-1 potassium hexachloroplatinate solution. It was possible to observe the shift to lower wave numbers of the signals referring to the N-H and C-N bands, suggesting that the interaction between Pt4+ ions and the silica material is predominantly through coordinative bonds between the ion and the amino groups. After the studies in the infrared region, test were performed on the electronic absorption of platinum ions with different concentrations, and then an analytical curve was constructed. However, two analytical curves were performed in order to quantitatively analyze the adsorption of platinum ions on silica materials. The first with concentrations of 10-3, 10-4, 10-5, 10-6 mol L-1 resulted in a good linear regression coefficient of 0,9995. At lower concentrations, at values of 12,2, 48,8, 97,5, and 195 ppm, the linear regression was also satisfactory, but with a value of 0,9801. Thus, the synthesized compound SIL-TMSDT proved to be effective for platinum (Pt4+) adsorption and efficiency pre-concentration.