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Comparison of drying methods for the retention of phenolic antioxidants in post-distillation solid residues of aromatic plants
Abstract
This study is focused on valorizing solid waste materials (SWM) obtained after the essential oil distillation of four aromatic plants (oregano, satureja, rosemary and salvia) to provide functional ingredients rich in phenolic compounds, by applying microwave-heating (MW), infrared-radiation (IR), oven-dried heating (DH), sun-drying (SD), shade-drying (SHD) and freeze-drying (FD) methods. The effect of the drying method on the bioactive components of SWM was analyzed and compared to the raw materials (before distillation). MW showed the best results in preserving phenolic antioxidants compared to the other drying processes, whereas FD provided dried SWM with the lowest antioxidant activity. Rosmarinic acid was detected in all SWM, while carnosol and carnosic acid were identified in rosemary and salvia SWM. The amount of these bioactive compounds remains very high in the post-distillation residues, and is worth exploiting their valorization, after optimization of the thermal processes. Overall, MW-drying is recommended as an eco-friendly method, applicable to drying of SWM of aromatic plants for their subsequent use as a source of valuable bioactive compounds in the food and pharmaceutical industries.
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“This reduction can be attributed to the heat sensitivity of certain volatile compounds, which may degrade or evaporate at higher DTs [33].”
From Thermal processing and geographical origin as drivers of terpenoids variation in Anethum graveolens L. essential oils: A biplot analysis (2025) · cites this paper as [33]
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Cited by
Farmanpour Kalalagh, K., Mohebodini, M., Sabaghnia, N., Beyraghdar Kashkooli, A., & Esmaeili, H. (2025) · PLOS One · doi:10.1371/journal.pone.0327018 · Cited by 4
Metadata
- Authors
- Skendi, A., Bouloumpasi, E., Chatzopoulou, P., Biliaderis, C. G., & Irakli, M.
- Venue
- LWT
- Publisher
- Elsevier BV
- Published
- 2023-11
- Volume
- 189
- Pages
- 115463
- ISSN
- 0023-6438
- Cited by
- 21
- References
- 0
- Language
- en
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