Studies on moisture sorption behaviour, thin layer drying and storage characteristics of horse gram under selected conditions
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Date
2005-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
This study envisaged observation of sorption behaviour of horse gram in temperature (50°-700) and water activity (0.09 to 0.95) and thin layer drying behavior in temperature ranged 40-70°C and in air velocity 15 to 45 m/min, drying experiments were also conducted in an oven under natural convection heat transfer. Additionally the storage behavior of the horse gram was also studied for a period of 180 days in three different types of storage bags. Six two parameter (BET, Henderson, Iglesias and Chirife, Mizrahi, Oswin and Smith model) and two three parameter (GAB and Hailwood and Horrobin) EMC models were tested for their suitability to describe the sorption behaviour. Among all the models tested, Hailwood and Horrobin equation gave the best fit with minimum value of average mean percentage deviation (p) and error at 90 percent data point (E90) and maximum value of R2. Out of four drying models (Exponential, Page, Thomson and Lcg model) fitted, Page model described the drying data more precisely in comparison to other three. As it gave the best fit with minimum value of p and E90 and maximum value of R2 Under storage studies, the horse gram was stored in three different types of storage bags namely Jute bag, Polyethylene bag and Polyethylene Lined Jute bag for 180 days under ambient temperature and relative humidity condition prevailing in the laboratory. The stored product quality parameters for the study included measurement of moisture content, thousand-kernel weight, dry matter loss, infestation, germination and protein content and change in the values over the storage period.
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