Abstract:Desorption isotherms of unblanched and blanched red peppers were experimentally obtained at 30C. The desorption data were exploited to estimate equilibrium moisture contents of the peppers at drying temperatures other than 30C by using a semi‐empirical method. Red pepper samples were dried in a tunnel‐type drier with an air velocity of 2 m/s at 50C, 60C, 70C, and 80C. The blanched samples dried faster than the unblanched ones. The drying behavior of unblanched and blanched samples was characterized by falling … Show more
“…The behavior of the drying rate curves (Figure 2) is in agreement with the studies of Turhan, Turhan and Sahbaz (1997), who found the constant rate period during drying of blanched chili peppers. However, the behavior observed in this study was contrary to that found by Akpinar, Bicer and Yildiz (2003), who observed that the drying of red pepper occurred only in the falling rate period at 55, 60, and 70 °C.…”
“…The behavior of the drying rate curves (Figure 2) is in agreement with the studies of Turhan, Turhan and Sahbaz (1997), who found the constant rate period during drying of blanched chili peppers. However, the behavior observed in this study was contrary to that found by Akpinar, Bicer and Yildiz (2003), who observed that the drying of red pepper occurred only in the falling rate period at 55, 60, and 70 °C.…”
“…This result was found to be somewhat different from the work of (Turhan et al, 1996) but such a variation could be attributed to the type of the applied drying method (tunnel drying). Diffusion coefficient (D) could be also related to the changes that occured in paprika quality during drying treatment as shown in table II.…”
RESUMENCalidad del color del pimentón: Efecto de tratamientos de secado al natural y al aire.
losBajo procesos de secado al natural y al aire se han investigado el color, la formación de compuestos de pardeamiento y los carotenoides totales como indicadores de la calidad del pimentón. Los datos obtenidos a partir de experimentos de secado al aire mostraron una relación inversa entre el aumento de la temperatura (40, 60 y 80° C) y la calidad del pimentón. En muestras secadas al natural, se llevaron a cabo tres tratamientos diferentes (sol, secado en la oscuridad y decolorado + secado al sol). Los datos revelaron un comportamiento irregular caracterizado por dos estados: el primero es biosintético y el segundo es degradativo con un efecto más profundo en la luz que en la oscuridad.El análisis de los datos por regresión multilinear fue también empleado para simular los resultados, especialmente los cambios en carotenoides totales como una función del tiempo.La evaluación sensorial para el color de las muestras indicó una larga variación en respuestas de los panelistas. Se recomendaron tratamientos a baja temperatura para favorecer la calidad del pimentón si es reducida la velocidad de formación de compuestos de pardeamiento.
PALABRAS-CLAVE: Color (calidad) -Pimentón -Secado al aire -Secado al natural.
SUMMARY Paprika color quality inview of air and natural drying treatments.Color, browning compounds formation and total carotenoids as indicator of paprika quality were investigated under air and natural drying processes. The data resulted from air drying experiments showed an inversely relationship between the progress in temperature (40, 60 and 80° C) and the paprika quality. In natural dried samples, three different treatments were carried out (sun, dark drying and blanching + sun drying). The data revealed an irregular pattern characterized by two stages: 1 st one is biosynthetic and the second is degradative with more profound effect in light more than darkness.Multilinear regression data analysis was also employed to simulate the results especially the changes in total carotenoids as a function of time.Sensory evaluation for color of the samples indicated a large variation in responses of panelists. Low temperature treatment was recommended to favour the quality of paprika if the rate of forming browning compounds is reduced.
KEY-WORDS: Air drying -Color (quality) -Natural drying -Paprika.
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