Marzuki, Sigit Uji and Pranoto, Yudi and Khumsap, Tabkrich and Nguyen, Loc Thai (2021) Effect of blanching pretreatment and microwave-vacuum drying on drying kinetics and physicochemical properties of purple-fleshed sweet potato. Journal of Food Science and Technology, 58 (8). 2884 – 2895. ISSN 00221155
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Abstract
In this study, drying kinetics and quality of purple-fleshed sweet potato (PFSP) subjected to microwave-vacuum drying were investigated. The effects of hot water and steam blanching pretreatment on physicochemical characteristics of the dried products were also considered. The samples were dehydrated in a custom-made microwave-vacuum system at different power levels including 450, 600 and 850 W. Hot air drying at 70 °C was also conducted for comparison. The results showed that drying time of PFSP under microwave-vacuum conditions ranged from 6 to 12 min, significantly reduced as compared to that of hot air drying (600 min). The improvement of drying rate was also evidenced by increased effective moisture diffusivity (2.22 × 10−7–4.05 × 10−7 m2/s) of the samples. Drying kinetics of PFSP was best fitted by Page and logarithmic model with R2 ranging from 0.991 to 0.998, and RMSE from 0.016 to 0.030. PFSP dried under microwave-vacuum condition had lower water absorption index and swelling capacity than hot air drying. Color, antioxidant activity and total phenolic content of dried PFSP were also improved under microwave-vacuum drying. The effects of blanching pretreatment on quality of dried PFSP were more dominant in hot air than microwave-vacuum dried samples. © 2020, Association of Food Scientists & Technologists (India).
Item Type: | Article |
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Additional Information: | Library Dosen |
Uncontrolled Keywords: | Blanching; Kinetics; Microwave heating; Microwaves; Physicochemical properties; Plants (botany); Solar dryers; Water absorption; Anti-oxidant activities; Effective moisture diffusivity; Logarithmic models; Microwave - vacuum drying; Physicochemical characteristics; Swelling capacities; Total phenolic content; Water absorption index; Drying |
Subjects: | S Agriculture > S Agriculture (General) T Technology > TP Chemical technology > Food processing and manufacture |
Divisions: | Faculty of Agricultural Technology > Food and Agricultural Product Technology |
Depositing User: | Sri JUNANDI |
Date Deposited: | 25 Oct 2024 08:40 |
Last Modified: | 25 Oct 2024 08:40 |
URI: | https://ir.lib.ugm.ac.id/id/eprint/5647 |