https://repositorio.ufms.br/handle/123456789/6393 2026-07-26T15:52:31Z 2026-07-26T15:52:31Z https://repositorio.ufms.br/handle/123456789/14661 2026-07-20T22:26:08Z 2026-01-01T00:00:00Z

Título: DISCRIMINAÇÃO QUÍMICA DE AMOSTRAS DE CANNABIS SATIVA MEDICINAIS E APREENDIDAS POR FINGERPRINT CROMATOGRÁFICO OBTIDO POR CG-EM E QUIMIOMETRIA Abstract: Recent regulatory changes in Brazil concerning the cultivation and medicinal use of Cannabis sativa L., driven by its well-documented therapeutic potential, have increased the demand for analytical methods capable of characterizing and differentiating materials originating from legally cultivated plants and samples seized during police operations targeting illicit drug trafficking. In this context, this study evaluated the application of chromatographic fingerprints obtained by gas chromatography–mass spectrometry (GC–MS), combined with multivariate statistical analysis, to differentiate Cannabis sativa samples, including medicinally cultivated inflorescences, seized inflorescences, and compressed cannabis samples collected from different border regions and submitted to the Forensic Laboratory Analysis Institute of the Civil Police of Mato Grosso do Sul State, Brazil. The chemical profiles were characterized by the predominance of cannabinoids, sesquiterpenes, and oxygenated derivatives. Chromatographic data were analyzed using Principal Component Analysis (PCA) and Partial Least Squares Discriminant Analysis to identify clustering patterns and discriminant variables. Chemometric analyses demonstrated that the observed variability was primarily associated with the balance between cannabinoids and volatile compounds susceptible to degradation, reflecting differences in sample preservation conditions. Sample type was identified as the main discriminating factor, allowing clear differentiation among cultivated inflorescences, seized inflorescences, and compressed cannabis samples, with PCA explaining 71.2% of the total variance. In contrast, geographical origin did not produce consistent clustering among the analyzed samples. The results demonstrate that GC–MS-based chromatographic fingerprints constitute a robust tool for the chemical characterization of C. sativa samples. When combined with chemometric analysis, these fingerprints become an important complementary tool for sample differentiation. However, whenever possible, their interpretation should be integrated with information regarding sample origin, case history, and other available forensic evidence to improve the reliability of the resulting inferences. Tipo: Trabalho de Conclusão de Curso

2026-01-01T00:00:00Z https://repositorio.ufms.br/handle/123456789/14282 2026-02-20T19:54:22Z 2026-01-01T00:00:00Z

Título: CONVERSÃO FOTOELETROQUÍMICA DE METANO EM ENERGIA UTILIZANDO FOTOCÉLULAS A COMBUSTÍVEL BASEADAS EM FOTOÂNODOS DE BiVO4/CoOx Abstract: Climate change associated with greenhouse gas emissions has driven the search for technologies capable of mitigating environmental impacts while simultaneously enabling sustainable energy generation. In this context, methane stands out due to its high global warming potential and elevated energy content, making it a strategic target for energy valorization processes. Among the available conversion technologies, photoelectrocatalysis emerges as a promising approach by employing solar energy to drive electrochemical reactions, combining energy recovery with environmental mitigation. This work investigates the performance of a methane-fed photo fuel cell (PFC) based on bismuth vanadate (BiVO4) photoanodes surface-modified with cobalt oxide (CoOx). BiVO4 has attracted significant attention as a photoanode material due to its suitable band gap of approximately 2.4 eV, enabling visible light absorption, chemical stability in aqueous solution, and relatively low cost, making it attractive for photoelectrochemical applications. The photoanodes were synthesized by electrodeposition followed by thermal conversion, while the CoOx cocatalyst was deposited on the surface through chemical impregnation and thermal treatment. Structural, morphological, optical, and electronic characterizations confirmed the preservation of the monoclinic phase of BiVO4, with an unchanged band gap of 2.46 eV, indicating that the modification predominantly affects the semiconductor/electrolyte interface. Mott–Schottky analysis revealed a shift in the flat-band potential from −0.02 to 0.15 VRHE and an increase in charge carrier density after CoOx modification. Electrochemical impedance spectroscopy demonstrated a significant reduction in polarization resistance, indicating improved charge transfer kinetics. During PFC operation, the BiVO4/CoOx photoanode exhibited a 64% increase in maximum power density when the anolyte was saturated with methane, reaching 0.38 mW under continuous flow conditions. These results demonstrate that the use of CoOx as a cocatalyst is an effective strategy to enhance the photoelectrochemical performance of BiVO4, highlighting the potential of this system for methane energy valorization and sustainable electricity generation. Tipo: Trabalho de Conclusão de Curso

2026-01-01T00:00:00Z https://repositorio.ufms.br/handle/123456789/14036 2025-12-08T22:23:10Z 2025-01-01T00:00:00Z

Título: PERFIL ESPECTRAL DE AZEITES DE OLIVA: ANÁLISE REGIOESPECÍFICA POR RMN DE 13C Abstract: To validate the use of 13C Nuclear Magnetic Resonance (NMR) combined with chemometrics as a precise method to detect the adulteration of olive oil with lower value-added oils. Tipo: Trabalho de Conclusão de Curso

2025-01-01T00:00:00Z https://repositorio.ufms.br/handle/123456789/13672 2025-12-03T15:36:51Z 2025-01-01T00:00:00Z

Título: Compatibilidade do solo sul matogrossense para plantação de eucalipto Abstract: Physical, chemical, and geographic composition are suitable for eucalyptus planting Tipo: Trabalho de Conclusão de Curso

2025-01-01T00:00:00Z