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The analytical model developed by Dincer and Dost [3] for the estimation of diffusivities and mass transfer coefficients has been reviewed, and the equations used for the evaluation of the mass transfer coefficients have been corrected. The corrected equations have been used for the calculation of mass transfer coefficients from literature data. It was observed that the corrected diffusivities showed significant differences from the previously calculated values. The use of the modified equations in future drying calculations will lead to more realistic mass transfer coefficient values. -
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The suitability of mandarin (MP), orange (OP) and pomegranate peel powders (PP) for co-pigmentation of dewberry, viburnum, red hawthorn, black hawthorn, and barberry anthocyanins was investigated. Spectrophotometric measurements indicated co-pigmentation causing both a hyperchromic effect (Delta ABS(max) 5-13) and bathochromic shift (Delta lambda (vis-max) up to 13 nm). The degradation kinetics of anthocyanins were estimated at temperatures ranging from 70 to 90 degrees C. First-order reactions with rate constants of 0.45-2.93 min(-1) and 0.30-2.00 min(-1) were observed for the reference and P ...More