Drying of guaco leaves: experimental and modeling kinetic, equilibrium isotherms and heat of desorption

Martins, Marina Roberto; Johann, Gracielle; Palú, Fernando; Silva, Edson Antônio da

doi:10.1007/s10973-021-11032-6

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…The moisture adsorption and desorption isotherms showed type II behavior (sigmoid shape), which is typical of biological materials [ 48 ]. Type II isotherms were observed by Lima-Corrêa et al [ 19 ] for basil leaves ( O. basilicum ); by Canabarro et al [ 49 ] for pitanga leaves ( Eugenia uniflora L.); by Santos et al [ 50 ] for jambu leaves ( Acmella oleracea ); and by Martins et al [ 51 ] for guaco leaves ( Mikania glomerata Sprengel).…”

Section: Resultsmentioning

confidence: 99%

“…Argyropoulos et al [ 55 ] evaluated the fits of five moisture sorption models and observed that the modified Oswin model was the one that best fitted the moisture sorption data of lemon balm leaves, in the temperature range from 25 °C to 45 °C. Martins et al [ 51 ], in turn, reported that the Oswin model was the one that best described the moisture sorption isotherms of guaco leaves, for a temperature range from 40 °C to 70 °C.…”

Section: Resultsmentioning

confidence: 99%

“…The basil leaves were ground in a multiprocessor for 2 min and 10 g samples were spread on aluminum trays, with known mass and dimensions. The material was submitted to convective drying in a tray dryer (Quimis-Q316M5), at temperatures of 40 °C, 50 °C, 60 °C, and 70 °C, which were chosen according to the literature [ 47 , 51 , 63 ]. To monitor the process, the set (tray + sample) was weighed every 10 min, in the first 30 min; every 15 min, for an additional 45 min; and every 30 min until reaching constant weight (mass variation less than 1%).…”

Section: Methodsmentioning

confidence: 99%

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Convective Drying of Purple Basil (Ocimum basilicum L.) Leaves and Stability of Chlorophyll and Phenolic Compounds during the Process

Chaves

Araújo

Pena

2022

Plants

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This study evaluated the effect of convective drying on the degradation of color and phenolic compounds of purple basil (Ocimum basilicum L.) leaves, and the hygroscopic behavior of dried leaves. The fresh leaves underwent drying at 40 °C, 50 °C, 60 °C, and 70 °C. Degradation of chlorophyll, flavonoids, and phenolic compounds were evaluated during drying and the hygroscopicity was evaluated through the moisture sorption isotherms. The drying mathematical modeling and the moisture sorption data were performed. The effective diffusivity for the drying increased from 4.93 × 10−10 m2/s at 40 °C to 18.96 × 10−10 m2/s at 70 °C, and the activation energy value (39.30 kJ/mol) showed that the leaves present temperature sensibility. The leaves dried at 40 °C had less degradation of phenolic compounds and color variation, but the drying process was too slow for practical purposes. Modified Page, Diffusion Approximation, and Verna models had excellent accuracy in drying kinetics. The isotherms showed that, in environments with relative humidity above 50%, the purple basil leaves are more susceptible to water gain, and at 8.83 g H2O/100 g db moisture, it guarantees the microbiological stability of the dried leaves. The Oswin model was the most suitable for estimating the moisture sorption isotherms of the dried leaves.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Convective Drying of Purple Basil (Ocimum basilicum L.) Leaves and Stability of Chlorophyll and Phenolic Compounds during the Process

Chaves

Araújo

Pena

2022

Plants

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show abstract

“…As in modeling and simulation, it is always interesting to use the simplest model, if it adequately describes the process, in the present work, we chose to use a phenomenological mathematical model of lumped parameters. For this, we evaluated the parameters external mass transfer coefficient,

k_{normalF}

, and effective mass diffusivity coefficient,

D_{eff}

, adjusted in a previous paper (Martins et al, 2021). These data were obtained for the drying of guaco leaves, in the solution of a distributed and thin layer parameter model.…”

Section: Methodsmentioning

confidence: 99%