Post-harvest of parsley leaves (Petroselinum crispum): Mathematical modelling of drying and sorption processes

Abstract

A B S T R A C TParsley is a species of wide production and trade in Brazil due to its high consumption as a condiment, fresh or dried. In the development of equipment used for drying, it is important to simulate and obtain theoretical information about the behavior of water loss for each product. Given the increasing use and potential commercialization of condimental plants, the objective of this work was to determine the isosteric heat of parsley leaves and fit mathematical models to the experimental data obtained in drying and desorption processes. The modified GAB and Midilli models were the most appropriate to describe the desorption isotherms and drying curves, respectively, for the studied temperatures. The isosteric heat varied from 3394.6 to 2830.0 kJ kg -1 for the equilibrium moisture content in the range from 0.0154 to 3.7232 (d.b.). Pós-colheita de folhas de salsinha (Petroselinum crispum):Modelagem matemática dos processos de secagem e dessorção R E S U M O A salsinha é uma espécie de ampla produção e comércio no Brasil devido ao seu alto consumo como condimento in natura ou seco. No desenvolvimento de equipamentos para secagem é importante a simulação e a obtenção de informações teóricas a respeito do comportamento de cada produto durante a remoção de água. Tendo em vista a crescente utilização e o potencial de comercialização de plantas condimentares, neste trabalho objetivou-se determinar o calor isostérico das folhas de salsinha e ajustar modelos matemáticos aos dados experimentais da secagem e da dessorção. O modelo de GAB modificado e de Midilli foram os mais adequados para descrever as isotermas de dessorção e as curvas de secagem, respectivamente, para as temperaturas estudadas. O calor isostérico variou de 3394,6 a 2830,0 kJ kg -1 para o teor de água de equilíbrio na faixa de 0,0154 a 3,7232 (b.s.). Key words:spice plant processing isosteric heat Palavras-chave: planta condimentar processamento calor isostérico

Use of sweet ‘Pêra’ peel as an adsorbent in the treatment of textile effluents

“…It was observed that, as expected, the higher the drying air temperature, the greater the reduction of moisture in the initial phase of the process (Figures 1A and B). This behavior has also been reported by other authors (Tamer et al, 2016;Corrêa Filho et al, 2018).…”

Post-harvesting of Solanum paniculatum L. leaves. Part I: Drying kinetics

“…The reduction in drying time with the increase in drying air temperature was already expected (Figure 2), a behavior observed in several studies with medicinal plants (Goneli et al, 2014;Melo et al, 2016;Gomes et al, 2017;Silva et al, 2017;Corrêa Filho et al, 2018). The drying time for jurubeba leaves to reach the final moisture content was also reduced by increasing the drying air speed, a behavior observed by Martins et al (2018) with Morus nigra L. leaves and by with Hyptis suaveolens leaves.…”

“…The Midilli model is usually the one that best fits to drying of leaves of medicinal plants, as it has already been verified for various products, such as for Petroselinum crispum Mill. leaves (Corrêa Filho et al, 2018), Cymbopogon citratus leaves (Gomes et al, 2017), Maytenus ilicifolia (Schrad.) Planch leaves (Melo et al, 2016), Genipa americana L. leaves (Silva et al, 2015), Schinus terebinthifolius leaves (Goneli et al, 2014), and Ocimum basilicum leaves (Reis et al, 2012).…”