Open AccessA comparative study of dried apple using hot air, intermittent and continuous microwave: evaluation of kinetic parameters and physicochemical quality attributes
Author(s) -
Aghilinategh Nahid,
Rafiee Shahin,
Gholikhani Abolfazl,
Hosseinpur Soleiman,
Omid Mahmoud,
Mohtasebi Seyed S.,
Maleki Neda
Publication year - 2015
Publication title -
food science and nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 27
ISSN - 2048-7177
DOI - 10.1002/fsn3.241
Subject(s) - thermal diffusivity , microwave , kinetic energy , chemistry , phenol , analytical chemistry (journal) , activation energy , kinetics , water content , moisture , materials science , microwave power , thermodynamics , chromatography , organic chemistry , physics , geotechnical engineering , quantum mechanics , engineering
In the study, the effectiveness of intermittent ( IMWD ) and continuous ( CMWD ) microwave drying and hot air drying ( HAD ) treatments on apple slices were compared in terms of drying kinetics (moisture diffusivity and activation energy) and critical physicochemical quality attributes (color change, rehydration ratio, bulk density, and total phenol content ( TPC ) of the final dried product. The temperature, microwave power, air velocity, and pulse ratio ( PR ) applied in the experiments were 40–80°C, 200–600 W, 0.5–2 m/s, and 2–6, respectively. Results showed that IMWD and CMWD more effective than HAD in kinetic parameters and physicochemical quality attributes. Also, results indicated CMWD had the lowest and highest drying time and effective diffusivity. The exponential model for estimating IMWD activation energy, considering absolute power (1/P) and pulse ratio were also represented. The color change in apple slices dried by HAD showed the highest change.