Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/92674
Title: Cyclic air temperature drying of guava pieces: Effects on moisture and ascorbic acid contents
Authors: Chua, K.J. 
Chou, S.K. 
Ho, J.C. 
Mujumdar, A.S.
Hawlader, M.N.A. 
Keywords: Cosine-wave profile
Equivalent temperature
Heat pump
Square-wave profile
Issue Date: Jun-2000
Source: Chua, K.J.,Chou, S.K.,Ho, J.C.,Mujumdar, A.S.,Hawlader, M.N.A. (2000-06). Cyclic air temperature drying of guava pieces: Effects on moisture and ascorbic acid contents. Food and Bioproducts Processing: Transactions of the Institution of of Chemical Engineers, Part C 78 (2) : 72-78. ScholarBank@NUS Repository.
Abstract: Moisture and ascorbic acid (AA) contents of batch-dried guava samples were measured under several cyclic temperature profiles of the drying air maintained at constant humidity. A two-stage heat pump dryer was used to obtain the desired cyclical variation of the drying temperature while keeping other drying air parameters constant. Experimental results on AA degradation of guava during drying were found to follow first-order kinetics for both isothermal and non-isothermal drying air conditions. Cyclic air-temperature drying was observed to yield higher retention of AA. Using a simplified model previously proposed for storage of foods, representative equivalent temperatures were computed for each time-temperature profile to correlate the AA degradation results to corresponding air temperature under isothermal conditions.
Source Title: Food and Bioproducts Processing: Transactions of the Institution of of Chemical Engineers, Part C
URI: http://scholarbank.nus.edu.sg/handle/10635/92674
ISSN: 09603085
Appears in Collections:Staff Publications

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