Chemical Pretreatments Affecting Drying Characteristics of Chilli (cv. Huarou Yon)

Author: Phomkong Wiriya  

Publisher: Taylor & Francis Ltd

ISSN: 0737-3937

Source: Drying Technology, Vol.28, Iss.12, 2010-12, pp. : 1466-1476

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Abstract

One- (70°C) and two-temperature regimes (70 and 50°C) were used to dry chilli (Capsicum annuum cv. Huarou Yon) using a laboratory tray dryer compared to conventional sun drying. A pretreatment was done by soaking chilli in antibrowning solutions before drying. It was found that the drying rate of chilli soaked in chemical solutions was increased and the drying period of chilli was decreased. Page's model was found to fit well with the experiment for one- and two-temperature drying using least squares analysis. The highest value of the coefficient of determination (R2 > 0.99), the lowest value of standard error of estimation (SEE < 0.00031), and="" the="" lowest="" value="" of="" the="" mean="" relative="" deviation="">< 10%) were="" obtained.="" the="" effective="" moisture="" diffusivities="" of="" chilli="" drying="" at="" 70°c="" and="" two-stage="" drying="" were="" between="" 6.01-7.22 × 10-10 m2/s="" and="" 3.16-3.89 × 10-10 m2/s,="" respectively.="" in="" contrast,="" the="" lowest="" value="" of="" effective="" moisture="" diffusivity="" of="" chilli="" was="" obtained="" by="" the="" conventional="" sun-drying="" method="" (0.597 × 10-10 m2/s).="" the="" highest="" value="" of="" moisture="" diffusivity="" was="" observed="" for="" chilli="" soaked="" in="" sodium="" metabisulfite="" (nams)="" mixed="" with="" cacl2="" solution="" for="" both="" one-="" and="" two-temperature="" regimes.="" the="" color="" of="" chilli="" was="" improved="" by="" using="" chemical="" pretreatments,="" in="" particular,="" chilli="" soaked="" in="" nams="" mixed="" with="" cacl2="" solution.="">