Modeling of drying and ameliorative effects of relative humidity (RH) against β-carotene degradation and color of carrot (Daucus carota var.) slices
2019
Sarpong, F., Jiangsu University, Zhenjiang, China | Zhou, C.S., Jiangsu University, Zhenjiang, China | Bai, J.W., Jiangsu University, Zhenjiang, China | Amenorfe, L.P., Kwame Nkrumah University of Science and Technology, Kumasi, Ghana | Golly, M.K., Jiangsu University, Zhenjiang, China | Ma, H.L., Jiangsu University, Zhenjiang, China
Drying and β-carotenes retention kinetics were predicted using models in relative humidity (RH) drying condition. This was achieved by drying carrot slices using RH-convective hot-air dryer at 60, 70 and 80℃ under RH (10% 20% and 30%) conditions at 2.0 m/s air velocity. Three mathematical models describing thin layer were compared to their goodness of fit in terms of coefficient of correlation (R²), root mean square error (RMSE) and reduced Chi square (x²). The Wang and Singh model could satisfactorily describe RH-convective drying of carrot slices with R², RMSE and x² in the ranges of 0.996-0.999, 5.4 x 10-4-9.4 x 10-4 and 0.0150-0.03353 respectively. The results reveal that a range of 3.61-8.2% retention of β-carotene was observed for every 10% increase in RH in various drying air temperature. In summary, higher temperatures were mainly responsible for β-carotenes degradation however this can be mitigated when drying is conducted under higher RH.
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