Resumen
The microstructure of plant tissues can be modified with calcium pretreatments. This modification changes the response of plant tissues subjected to drying in relation to the moisture loss and the resulting stresses of the concentration gradient. The present work evaluates the effect of pretreatment with Ca(OH)2
on the drying kinetics and the texture characteristics of papaya (Carica papaya L., cv. Maradol). Papaya cubes were immersed in a 1.5% w/v aqueous solution of Ca(OH)2, a temperature of 25 °C for 3 h and convectively dried at air temperature of 70 °C, air flow of 1.5 m/s and HR = 3 ± 0.5%. The kinetics of moisture loss was measured and the texture profile was analyzed in samples with and without calcium pretreatment. The drying time of the pretreated samples with a Deff = 3.34 x 10-9 m2/s was lower (up to
40% less) than the control samples with a Deff = 1.66 x 10-9 m2/s. The texture parameters showed significant differences (α = 0.05) between fresh samples, with and without calcium pretreatment. The pretreatment with Ca(OH)2 applied to samples, increased the values of the physical texture characteristics, but after
convective drying, the adhesiveness decreased due to the water loss by thermal effect. The structural modification in papaya favored the decrease of drying time, increased the drying rate, and the moisture diffusion. Also, the cubes had a firm structure with minimum deformation and shrinkage, which are prepared to apply pretreatments as osmotic dehydration or other drying methods.
on the drying kinetics and the texture characteristics of papaya (Carica papaya L., cv. Maradol). Papaya cubes were immersed in a 1.5% w/v aqueous solution of Ca(OH)2, a temperature of 25 °C for 3 h and convectively dried at air temperature of 70 °C, air flow of 1.5 m/s and HR = 3 ± 0.5%. The kinetics of moisture loss was measured and the texture profile was analyzed in samples with and without calcium pretreatment. The drying time of the pretreated samples with a Deff = 3.34 x 10-9 m2/s was lower (up to
40% less) than the control samples with a Deff = 1.66 x 10-9 m2/s. The texture parameters showed significant differences (α = 0.05) between fresh samples, with and without calcium pretreatment. The pretreatment with Ca(OH)2 applied to samples, increased the values of the physical texture characteristics, but after
convective drying, the adhesiveness decreased due to the water loss by thermal effect. The structural modification in papaya favored the decrease of drying time, increased the drying rate, and the moisture diffusion. Also, the cubes had a firm structure with minimum deformation and shrinkage, which are prepared to apply pretreatments as osmotic dehydration or other drying methods.
| Idioma original | Español (México) |
|---|---|
| Páginas (desde-hasta) | 56-62 |
| Número de páginas | 7 |
| Publicación | Avances en Ingieniería Química |
| Volumen | 1 |
| N.º | 1 |
| Estado | Publicada - 7 may. 2019 |