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.="">
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