Navegando por Assunto "Bixa orellana"

Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Análise experimental do processo de secagem de urucum (Bixa orellana L.) em leito fixo
(Universidade Estadual de Campinas, 1998-12-18) FARIA, Lênio José Guerreiro de; ROCHA, Sandra Cristina dos Santos; http://lattes.cnpq.br/3173533801776868
The drying of annatto seeds (Bixa orellana L.), type Red Piave, was studied in a fixed bed dryer. The optimal conditions were obtained to minimize the bixin losses and to obtain the final moisture content of seeds in the adequate lovels for conservation and quality maintenance. The bixix and the final moisture contents were studied as a function of the operational variables of the drying process. The termodynamic behavior of the seeds during the process of moisture desorption was verified by the static gravimetric method, using saturated salt solutions to maintain atmospheres with relative humidities in the range from 7 to 75%, at temperatures between 15 and 80ºC. GAB medel was used to fit the experimental data and the three parameters of GAB equation were evaluated. The Clausisus-Clapeyron equations was applied to obtain the net isosteric heats of sorption, using the desorption isotherm¿s data. It was verified that the annatto seeds can be conserved with higher stability in atmospheres with relative humidity of 60% in the range of temperatures studied. The quantification of the influences of the inlet variables of the process in the final moisture and bixin contents of the seeds and the identification of the optimal point for the process was accomplished by techniques of fractional factorial design, response surface methodology, canonical analysis and desirability function. Its was verified that the final moisture content of the seeds can be estimated by a second order polynomial model as a function of the is temperature and mass flow rate and of the dryng time, and that final bixin content is significantly influenced only by the process time, being described appropriately by linear model.
Acesso aberto (Open Access)
Optimization of annatto (Bixa orellana L.) drying in fixed bed
(2000-12) FARIA, Lênio José Guerreiro de; ROCHA, Sandra Cristina dos Santos
The drying of annatto seeds (Bixa orellana L.), red piave cultivate, was studied in a fixed bed dryer. The best conditions were estimated to minimize the loss of coloring and to obtain final moisture of the seeds in appropriate levels to its conservation and maintenance of quality. The quantification of the influence of entrance variables in the final contents of bixin and moisture seeds and the identification of the optimal point was performed through the techniques of factorial design, response surfaces methodology, canonical analysis and desirability function. It was verified that the final moisture of the seeds may be estimated by a second-order polynomial model and that the final content of bixin is only significantly influenced by the time of drying being described properly by a linear model, for the seeds used in this study.