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Optimal pretreatment determination of kiwifruit drying via online monitoring
Author(s) -
Nadian Mohammad Hossein,
AbbaspourFard Mohammad Hossein,
Sadrnia Hassan,
Golzarian Mahmood Reza,
Tabasizadeh Mohammad
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7856
Subject(s) - blanching , shrinkage , chemistry , ascorbic acid , food science , dehydration , chromatography , horticulture , materials science , biology , composite material , biochemistry
Abstract BACKGROUND Pre‐treating is a crucial stage of drying process. The best pretreatment for hot air drying of kiwifruit was investigated using a computer vision system ( CVS ), for online monitoring of drying attributes including drying time, colour changes and shrinkage, as decision criteria and using clustering method. Slices were dried at 70 °C with hot water blanching ( HWB ), steam blanching ( SB ), infrared blanching ( IR ) and acid ascorbic 1% w/w ( AA ) as pretreatments each with three durations of 5, 10 and 15 min. RESULTS The results showed that the cells in HWB ‐pretreated samples stretched without any cell wall rupture, while the highest damage was observed in AA ‐pretreated kiwifruit microstructure. Increasing duration of AA and HWB significantly lengthened the drying time while SB showed opposite results. The drying rate had a profound effect on the progression of the shrinkage. The total colour change of pretreated samples was higher than those with no pretreatment except for AA and HWB . The AA could well prevent colour change during the initial stage of drying. Among all pretreatments, SB and IR had the highest colour changes. CONCLUSION HWB with a duration of 5 min is the optimum pretreatment method for kiwifruit drying. © 2016 Society of Chemical Industry