The ultrasound-assisted extraction (UAE) was applied to enhance the extraction efficiency of oil from babassu kernel (BKO) using n-hexane as solvent. For this purpose, the effects of temperature (30 to 60°C), solvent to kernel ratio (6 to 10 ml g −1 ), and time (10 to 30 min) on oil yield (Y o ) were determined, in addition to assessing the effect of these variables in the characteristics of the obtained oil. In the condition of maximum extraction, the chemical composition of the oil was determined and the results were compared with the Soxhlet extraction. In the evaluated experimental range, the amount of solvent used in the process influenced the Y o , while time and temperature had no effect on the response variable. With this, a high oil removal of kernels (89.5% obtained by Soxhlet) was obtained in low conditions of time (10 min) and temperature (30°C), in addition to using a smaller amount of solvent (10 ml g −1 ) in relation to conventional technique (30 ml g −1 ). The lowest evaluated temperature (30°C) was also indicated to obtain an oil with higher content of phenolic compounds and antioxidant activity. BKO showed a predominance of lauric (~49.9%) and myristic acids (~15.6%), and high oxidative stability. The quality of the oil extracted by the UAE
O objetivo deste trabalho foi avaliar a influência da aplicação de coberturas comestíveis como pré-tratamento a secagem convectiva sobre a alteração da cor, cinética de secagem e coeficiente de difusão da água do mamão. Para tanto, mamões foram devidamente higienizados, descascados, fatiados e cortados no formato de cilindro. Algumas amostras foram mergulhadas em soluções de pectina (2% p/p), outras em alginato de sódio (2% p/p) e outras em fécula de mandioca (5% p/p), todas com acréscimo de sorbitol como plastificante. Amostras sem cobertura foram usadas como controle. Todas as amostras foram submetidas posteriormente à secagem convectiva a 60 °C. Observou-se que a segunda lei de Fick se ajustou bem aos dados experimentais e que as coberturas comestíveis não influenciaram na transferência de massa durante o processo de secagem. A aplicação das coberturas influenciou a cor do produto seco. Os resultados destacaram o potencial uso de revestimentos comestíveis como uma alternativa para melhorar a qualidade do produto após a secagem convectiva.
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