Article ; Online: Effects of microwave drying on physicochemical characteristics, microstructure, and antioxidant properties of propolis extract.
Journal of the science of food and agriculture
2023 Volume 104, Issue 4, Page(s) 2189–2197
Abstract: Background: The heat sensitivity of phenolics and flavonoids leads to considerable losses of these compounds during conventional drying. Microwave drying has the advantage of shorter drying time and rigorous process control, minimizing damage to heat- ... ...
| Abstract | Background: The heat sensitivity of phenolics and flavonoids leads to considerable losses of these compounds during conventional drying. Microwave drying has the advantage of shorter drying time and rigorous process control, minimizing damage to heat-sensitive compounds. Microwave drying kinetics and the impacts of microwave drying on physicochemical characteristics, morphological structure, antioxidant properties, total phenolics, and flavonoid content of propolis extract were investigated. Results: Increasing the microwave power output from 180 to 900 W resulted in a 67% reduction in drying time. Morphological changes were more noticeable at higher microwave power levels as shown in scanning electron microscopy images. Water activity values of microwave dried propolis extracts were below 0.4, which satisfied the requirement for shelf-stable dry products. The solubility of microwave dried propolis extract increased with increasing microwave power level, and the highest solubility was achieved for the propolis extract microwave dried at 900 W. Microwave dried propolis extracts exhibited lower total phenolic content levels than fresh propolis extract. The microwave power level did not affect the total flavonoid content but it affected 2,2-diphenyl-1-picrylhydrazyl (DPPH) free-radical scavenging activity of microwave dried propolis extracts. The DPPH free-radical scavenging activity closest to the fresh propolis extract was obtained for the microwave dried propolis extract at 900 W. This also showed the highest 6-hydroxy-2,5,7,8-tetramethyl-2-carboxylic acid (Trolox) equivalent antioxidant capacity. Conclusion: Microwave drying of propolis extract at 900 W was found to be the most efficient drying condition because it yielded the shortest drying time, the highest effective moisture diffusivity, and phenolic and flavonoid content levels that were very similar to those in fresh propolis extract. © 2023 Society of Chemical Industry. |
|||||
|---|---|---|---|---|---|---|
| MeSH term(s) | Antioxidants/chemistry ; Propolis/chemistry ; Microwaves ; Flavonoids/pharmacology ; Plant Extracts/chemistry | |||||
| Chemical Substances | Antioxidants ; Propolis (9009-62-5) ; Flavonoids ; Plant Extracts | |||||
| Language | English | |||||
| Publishing date | 2023-11-27 | |||||
| Publishing country | England | |||||
| Document type | Journal Article | |||||
| ZDB-ID | 184116-6 | |||||
| ISSN | 1097-0010 ; 0022-5142 | |||||
| ISSN (online) | 1097-0010 | |||||
| ISSN | 0022-5142 | |||||
| DOI | 10.1002/jsfa.13106 | |||||
| Shelf mark |
|
|||||
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
Full text online
More links
Kategorien
In stock of ZB MED Cologne/Königswinter
| Zs.B 808: Show issues | Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular ab Jg. 2022: Lesesaal (EG) |
Order via subito
This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.