Drying Kinetics of Gum Karaya (Sterculia urens) Using Convective Air Dryer.
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Date
2014-07
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Abstract
The present study was aimed to investigate the drying kinetics of gum karaya (S. urens).
Three grades of gum (I, II, III) were dried using a cabinet-type convective dryer. Particle
size equivalent to US Sieve size-6 and air temperatures of 50, 60 and 70°C were used for
the drying experiments. The experimental drying data was fitted to Page’s model to
predict the drying kinetics. Investigations with constant air velocity revealed that for grade-
I gum, drying rate constant (k) varied between 0.2744-0.3742 (h-1), for grade-II gum
between 0.3208-0.4439 (h-1) and for grade-III gum between 0.4098-0.4639 (h-1). The
dimensionless number (n) was always more than 1 and minimum value of the Coefficient
of determination (R2) was 0.967. Increase in air temperature enhanced drying process
and drying rate. For each particular temperature, the values of drying rate constant were
minimum for grade-I, maximum for grade-III and intermediate for grade-II gum.
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Keywords
Gum karaya, convective hot air drying, drying kinetics, Sterculia urens
Citation
Singh Jaspreet, Singh Balwinder. Drying Kinetics of Gum Karaya (Sterculia urens) Using Convective Air Dryer. British Journal of Pharmaceutical Research. 2014 July; 4(13): 1647-1656.