Browsing by Author "Resende, Osvaldo"
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- Analysis of volatiles of rose pepper fruits by GC/MS: drying kinetics, essential oil yield, and external color analysisPublication . Oliveira, Kênia Borges de; Carocho, Marcio; Finimundy, Tiane C.; Resende, Osvaldo; Célia, Juliana Aparecida; Gomes, Francileni Pompeu; Quequeto, Wellytton Darci; Bastos, Fabiano José de Campos; Barros, Lillian; Ferreira Junior, Weder NunesCondiments and culinary supplements are subjected to long-term storage and may undergo physical, chemical, and biological changes that can influence their quality. )us, the objective of the present study was to analyze the drying kinetics of rose pepper (Schinus terebinthifolius Raddi) fruits in an oven with forced air circulation at different temperatures, namely, 45, 55, 65, and 75°C, and determine the effective diffusion coefficient and activation energy using different mathematical models. Furthermore, the effects of the different drying temperatures were analyzed for external color parameters and yield of essential oil contents by gas chromatography coupled to a mass spectrometer. Of the ten models used for fitting, )ompson’s model was one with the best fitting to represent the drying of rose pepper fruits. )e diffusion coefficient increases with the elevation of drying air temperature, described by the Arrhenius equation, with activation energy of 53.579 kJ·mol− 1. )e color of the fruits decreased in lightness (L∗) with the increase in temperature. Of the thirty-eight terpenes identified, α-pinene and cis-ocimene were the most abundant, with the overall highest yield being found at a drying temperature of 45°C.
- Drying kinetics of cinnamon (Cinnamomum zeylanicum J. Presl) leaves: effects on individual volatile compounds and external colorPublication . Celia, Juliana Aparecida; Resende, Osvaldo; Carocho, Márcio; Finimundy, Tiane C.; Oliveira, Kenia Borges de; Gomes, Francileni Pompeu; Quequeto, Wellytton Darci; Barros, Lillian; Ferreira Junior, Weder NunesThe post-harvest stage of crops aims to minimize losses occuring during storage and commercialization. Drying process are some of the most used methods to minimize those losses. This work aimed at studying the drying kinetics of cinnamon (Cinnamomum zeylanicum), subject to two different drying conditions, one of which in an experimental fixed-bed dryer relying on an ambient air and speed of 0.5 m s-1, and the other with a forced air circulation oven at different temperatures (313.5, 323.15, 333.15 and 343.15 degrees K). The time required to reach the moisture equilibrium contents was 1.42, 3.0, 6.41, 14.0 and 21 h for drying temperatures of 343.15, 333.15, 323.15, 313.5 and 307.95 oK, respectively. The Arrhenius equation described the diffusivity's dependence on temperature, defining the activation energy of 64.77 kJ mol-1. The essential oils of the samples were analyzed through gas chromatography, which identified 23 individual compounds being eugenol the most abundant.
- Influência da temperatura de secagem nos compostos fenólicos e nas propriedades bioativas de folhas, caules e casca de Croton urucurana BaillPublication . Alves, Jáliston Júlio Lopes; Dias, Maria Inês; Barros, Lillian; Calhelha, Ricardo C.; Resende, Osvaldo; Aguiar, Ana Carolina Ribeiro; Ferreira, Isabel C.F.R.A secagem de plantas medicinais (tecnologia física de processamento térmico) é um processo crucial que visa a manutenção da qualidade pós-colheita, bem como a conservação de compostos bioativos com propriedades fitoterapêuticas [1,2]. Croton urucurana Baill, conhecida popularmente no Brasil como sangra d’água, é principalmente utilizada pelas suas propriedades anti-hemorrágicas, anti-inflamatórias, anti-sépticas, cicatrizantes e pela sua ação antifúngica e entomológica [3,4]. O presente trabalho teve como objectivo verificar a influência da temperatura de secagem (40, 50, 60 e 70 °C) no perfil fenólico (obtido por HPLC-DAD-ESI/MS) de folhas, caules e casca da espécie anteriormente referida; bem como nas propriedades antioxidantes e citotóxicas dos seus extratos hidroetanólicos e aquosos (obtidos por decocção). Relativamente aos compostos fenólicos, o perfil foi muito semelhante em todas as amostras, havendo somente diferenças na quantidade de cada um dos compostos; as folhas secas a 40°C revelaram a maior concentração de compostos fenólicos. Foram identificados flavan-3-óis, flavonas, flavonóis e ácidos fenólicos (o ácido gálico foi somente detetado nos caules). A maior atividade antioxidante foi observada nos extratos hidroetanólicos de folhas e caules secos a 50 °C e de casca seca a 40 °C. Todas as amostras revelaram atividade citotóxica, sendo que os GI50 mais baixos foram também obtidos nos extratos hidroetanólicas e a temperaturas de secagem mais baixas. Com estes resultados podemos concluir que as altas temperaturas de secagem influenciam o conteúdo de compostos fenólicos e as propriedades bioativas de Sangra d’água. A adequabilidade das temperaturas de secagem para o processamento de plantas medicinais é de extrema importância para a indústria de forma a preservar as suas propriedades bioativas.
- Phenolic profile of Croton urucurana Baill. Leaves, stems and bark: pairwise influence of drying temperature and extraction solventPublication . Alves, Jáliston Júlio Lopes; Dias, Maria Inês; Barreira, João C.M.; Barros, Lillian; Resende, Osvaldo; Aguiar, Ana Carolina Ribeiro; Ferreira, Isabel C.F.R.Cerrado biome represents an area with great biodiversity. Some of its plants have significant ethnopharmacological uses, with specific purposes. Croton urucurana Baill., for instance, was previously acknowledged for its anti-hemorrhagic, anti-inflammatory, antiseptic, healing, and potentially antifungal and entomopathogenic actions. Nevertheless, the compounds supporting these empirical applications are still unknown. Accordingly, this work was designed to achieve a complete characterization of the phenolic profile of di erent botanical tissues obtained from C. urucurana, and also to verify how di erent operational conditions (di erent drying temperatures and extraction conditions) a ect that profile. All samples were further characterized by HPLC–DAD–ESI/MSn, and results were compared by advanced chemometric tools. In general, the drying temperatures that maximize the extraction yield of specific individual phenolic compounds were established. Likewise, it was possible to verify that samples extracted with the hydroethanolic solution allowed higher phenolic yields, either in individual compounds (except (epi)catechin-di-O-gallate) or total phenolics. The identification of the best operational conditions and phenolic profiles associated with each C. urucurana botanical part contributes to enabling their use in food or pharmaceutical-related applications.