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Open AccessArticle

The Effect of Infrared Drying on Color, Projected Area, Drying Time, and Total Phenolic Content of Rose (Rose electron) Petals

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Department of Mechanical Engineering, Czech University of Life Sciences Prague, Kamycka 129, 16521 Prague, Czech Republic
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Department of Quality of Agricultural Products, Czech University of Life Sciences, Faculty of Agrobiology, Food and Natural Resources, Kamýcka 129, 16521 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Plants 2020, 9(2), 236; https://doi.org/10.3390/plants9020236 (registering DOI)
Received: 16 December 2019 / Revised: 20 January 2020 / Accepted: 22 January 2020 / Published: 12 February 2020
(This article belongs to the Section Plant Protection)
The effects of different drying temperatures (50, 60, 70 °C) on the quality of rose (Rose electron) petals were evaluated in this study. Drying time decreased from 1680 s to 600 s with increased infrared temperature. The temperature and time were increased from 50 °C to 70 °C and 30 min to 60 min, respectively, and a decrease in the fruit color quality was observed. The projected area (PA) of rose petals was affected significantly from temperature. After the drying process, the largest PA was observed as 33.35 cm2 (50 °C, 30 min), while the smallest achieved at 70 °C, 60 min (27.96 cm2). Depending on the temperature values (50, 60, 70 °C), the average projection area of dry samples of the rose petals decreased 2.17 times compared to the projection area of fresh samples. The dried samples demonstrated an increase in the total phenolic (TP) content compared to the fresh samples. The maximum TP (44.49 mg GAE/g) was achieved at 45 min and 70 °C rose petals sample. The results concluded that infrared drying for 45 min at 70 °C could be recommended for drying rose (rosa electron) petals. View Full-Text
Keywords: infrared drying; rose petals; drying process; total phenolic content infrared drying; rose petals; drying process; total phenolic content
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MDPI and ACS Style

Selvi, K.Ç.; Kabutey, A.; Gürdil, G.A.K.; Herak, D.; Kurhan, Ş.; Klouček, P. The Effect of Infrared Drying on Color, Projected Area, Drying Time, and Total Phenolic Content of Rose (Rose electron) Petals. Plants 2020, 9, 236.

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