RESUMOObjetivou-se avaliar a cinética de secagem das sementes da algaroba em camada fina e em diferentes temperaturas utilizando os modelos matemáticos semi empíricos de Henderson & Pabis, Lewis, Page, Cavalcanti Mata, Exponencial de Dois Termos e Midilli et al., para ajuste dos dados experimentais. A cinética de secagem foi realizada em triplicata utilizando uma estufa com circulação forçada de ar, com velocidade em torno de 1 m s-1, nas temperaturas de 50, 60 e 70°C e por tempos determinados até massa constante. Em todos os tratamentos, os modelos matemáticos ajustados aos dados experimentais apresentaram R² superior a 95,02% e valores de DQM inferiores a 0,0048. Dentre as equações testadas, as de Cavalcanti Mata, Midilli et al. e Page aproximaram-se mais dos pontos experimentais que os demais modelos utilizados. Os modelos de Cavalcanti Mata, Page e Midilli apresentaram os menores valores de DQM e melhores coeficientes estatísticos para descrever as curvas de secagem. Recomenda-se utilizar o modelo de Page para secagem de grãos de algaroba por possuir o menor número de termos, apresentar excelentes valores de R2 e DQM, representar de forma eficiente as curvas de secagem para as diferentes temperaturas e ser de fácil aplicação.Palavras-chave: curvas de secagem, energia de ativação, modelos matemáticos, Prosopis juliflora ABSTRACT The objective of this study was to evaluate the drying kinetics of mesquite seeds in a thin layer and at different temperatures using the semi-empirical mathematical models of Henderson & Pabis, Lewis, Page, Cavalcanti Mata, Exponential of Two Terms and Midilli et al., To adjust the experimental data. The drying kinetics was performed in triplicate using a forced air circulation oven, with speed around 1 m s-1, at temperatures of 50, 60 and 70 ° C and for determined times until constant mass. In all treatments, the mathematical models adjusted to the experimental data presented R² above 95.02% and DQM values below 0.0048. Among the tested equations, those of Cavalcanti Mata, Midilli et al. and Page were closer to the experimental points than the other models used. Cavalcanti Mata, Page and Midilli models presented the lowest DQM values and the best statistical coefficients to describe the drying curves. It is recommended to use the Page model for drying mesquite grains because they have the fewest terms, have excellent values for R2 and DQM, represent the drying curves for different temperatures efficiently and are easy to apply.

This study performed the phytochemical screening and bioactivity of Celosia argentea leaves. The phytochemical profile of hexane (Hex), ethyl acetate (AcOEt) and methanolic (MeOH) extracts of C. argentea leaves was observed by Thin Layer Chromatography and spectrophotometric analysis. In the susceptibility test, the disk-diffusion technique was performed. Minimum Inhibitory Concentration (MIC) was assessed by microdilution. Minimum Microbic Concentration (MMC) was determined in the extracts which presented MIC. Antioxidant activities were measured using 2,2-diphenyl-1-picril-hidrazil (DPPH), determination of reducing power and total antioxidant capacity (TAC). The results showed a higher content of phenolic compounds (252.02 ± 0.02 mg GAE/g) in the extract AcOEt, and of tannins (103.72 ± 0.004 mg/EAT/g) in MeOH; this was effective against Micrococcus luteus (inhibition of 24.7 ± 0.6 mm). MIC and CMM of the AcOEt for M. luteus were 0.06 and 0.25 mg/mL, respectively. The MeOH extract eliminated 70.4 ± 0.03% of DPPH radical, whereas AcOEt had greater reducing power (289.23 ± 0.05 mg AA/g) and TAC at a concentration of 250 µg/mL (89.6%). This study revealed that C. argentea has phytochemicals with bactericidal and fungicidal potential, in addition to elevated antioxidant power. Key words: antimicrobial, antioxidant, bioactivity.

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