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Drying kinetics, colour, total phenolic content and antioxidant capacity properties of kiwi dried by different methods

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Abstract

This study analysed the convective (60, 70 and 80° C), microwave (120 and 350 W) and freeze drying methods in terms of their effects on the drying characteristics, colour, total phenolic content (TPC) and antioxidant capacity of kiwi slices. Nine different mathematical models were applied to experimental data to achieve the most accurate calculation for drying curves. The Midilli et al. and Wang and Singh models proved to be the most suitable at explaining the drying kinetics of kiwi samples as compared to other models according to the statistical tests. Each drying method was significantly affected by colour parameters (L*, a*, b*, C, α and ΔE). The dried samples exhibited respectively 5–49 % and 10–47 % less TPC and antioxidant capacity compared to the fresh sample. According to the correlation analysis conducted between TPC and antioxidant capacity for kiwi slices, there is a positive correlation (R 2 = 0.7796). Microwave dried samples at 120 W particularly had the lowest TPC and antioxidant capacity. Freeze drying method yielded the closest values with respect to colour values, total phenol content and antioxidant capacity to those of fresh samples when compared to the other methods.

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Acknowledgments

The authors of the study would like to thank the Uludag University Research Foundation for their financial support (Project No. OUAP(Z)-2014/6).

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Authors and Affiliations

  1. Department of Biosystems Engineering, Faculty of Agriculture, University of Uludag, Gorukle Campus, 16059, Bursa, Turkey

    Nazmi Izli & Onur Taskin

  2. Department of Food Engineering, Faculty of Natural Sciences, Architecture and Engineering, University of Bursa Technical, 16190, Bursa, Turkey

    Gökcen Izli

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  1. Nazmi Izli
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Correspondence to Nazmi Izli.

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Izli, N., Izli, G. & Taskin, O. Drying kinetics, colour, total phenolic content and antioxidant capacity properties of kiwi dried by different methods. Food Measure 11, 64–74 (2017). https://doi.org/10.1007/s11694-016-9372-6

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  • DOI: https://doi.org/10.1007/s11694-016-9372-6

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