Investigation of Rosa Flower Bud Drying Kinetics, Total Phenol and Color Indices Variations at Different Drying Methods

Roustapour, Omid Reza; Golshan Tafti, Aَbolfazl; Gazor, Hamid Reza; Sefidkon, Fatemeh

doi:10.22092/amsr.2025.367749.1505

Document Type : Original Article

Authors

¹ Agricultural Engineering Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

² Agricultural Engineering Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.

³ Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

10.22092/amsr.2025.367749.1505

Abstract

Production of dried Rosa flower bud with high quality of color and essential oil is concerned for related industries. Six methods of drying process including shade drying (control), indirect solar dryer, cabinet dryer in three levels of inlet air temperature (40, 50, 60^oC) and freeze dryer were compared in order to dry flower bud. Kinetics of drying, color indices and total phenol were determined in three replications and compared for the sixth drying methods. Results showed that the highest intensity of drying occurred in cabinet dryer (60^oC) and the lowest intensity of drying occurred in freeze dryer. The phenol reduction in buds dried in cabinet dryer (40, 50, 60^oC), solar dryer and freeze dryer were 12, 17, 21.7, 26 percent respectively, compared to control (shade drying). The maximum color index (L*) in the inner and outer petals of dried buds happened in freeze dryer. This index in the inner and outer petals of dried buds dried in cabinet dryer (50^oC) was 5 and 1.93 percents less than the index in the petals dried in cabinet dryer (60^oC). The prolongation of drying process caused decrease in the brightness of petals. The maximum value of a* index (25.61) was observed in the outer petal buds which dried in cabinet dryer (50^oC). No significant difference was shown in the b* index in the outer and inner petal bud, dried in cabinet dryer (50^oC), solar dryers and in shade.

Keywords

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Agricultural Mechanization and Systems Research

Investigation of Rosa Flower Bud Drying Kinetics, Total Phenol and Color Indices Variations at Different Drying Methods

References

References

Volume 25, Issue 89 - Serial Number 89
April 2024
Pages 49-68

Investigation of Rosa Flower Bud Drying Kinetics, Total Phenol and Color Indices Variations at Different Drying Methods

References

References

Volume 25, Issue 89 - Serial Number 89April 2024Pages 49-68

Volume 25, Issue 89 - Serial Number 89
April 2024
Pages 49-68