Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods
The preservation of active constituents in fresh herbs is affected by drying methods. An effective drying method for Strobilanthes crispus which is increasingly marketed as an important herbal tea remains to be reported. This study evaluated the effects of conventional and new drying technologies, n...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Multidisciplinary Digital Publishing Institute
2019
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| Online Access: | http://psasir.upm.edu.my/id/eprint/80680/1/PHYTO.pdf |
| _version_ | 1825951329630027776 |
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| author | Yen, Lisa Wen Chua Bee, Lin Chua Figiel, Adam Chien, Hwa Chong Wojdylo, Aneta Szumny, Antoni Shean, Thomas Yaw Choong |
| author_facet | Yen, Lisa Wen Chua Bee, Lin Chua Figiel, Adam Chien, Hwa Chong Wojdylo, Aneta Szumny, Antoni Shean, Thomas Yaw Choong |
| author_sort | Yen, Lisa Wen Chua |
| collection | UPM |
| description | The preservation of active constituents in fresh herbs is affected by drying methods. An effective drying method for Strobilanthes crispus which is increasingly marketed as an important herbal tea remains to be reported. This study evaluated the effects of conventional and new drying technologies, namely vacuum microwave drying methods, on the antioxidant activity and yield of essential oil volatiles and phytosterols. These drying methods included convective drying (CD) at 40 ◦C, 50 ◦C, and 60 ◦C; vacuum microwave drying (VMD) at 6, 9, and 12 W/g; convective pre-drying and vacuum microwave finish drying (CPD-VMFD) at 50 ◦C and 9 W/g; and freeze-drying (FD). GC–MS revealed 33 volatiles, and 2-hexen-1-ol, 2-hexenal, 1-octen-3-ol, linalool, and benzaldehyde were major constituents. The compounds β-sitosterol and α-linolenic acid were the most abundant phytosterol and fatty acid, respectively, in fresh S. crispus. The highest phenolic content was achieved with CD at 60 ◦C. The highest antioxidant activity was obtained with CD at 40 ◦C and VMD at 9 W/g. On the contrary, the highest total volatiles and phytosterols were detected with CD at 50 ◦C and VMD at 9 W/g, respectively. This study showed that CD and VMD were effective in producing highly bioactive S. crispus. A suitable drying parameter level, irrespective of the drying method used, was an important influencing factor. |
| first_indexed | 2024-03-06T10:28:22Z |
| format | Article |
| id | upm.eprints-80680 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T10:28:22Z |
| publishDate | 2019 |
| publisher | Multidisciplinary Digital Publishing Institute |
| record_format | dspace |
| spelling | upm.eprints-806802020-11-12T00:44:31Z http://psasir.upm.edu.my/id/eprint/80680/ Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods Yen, Lisa Wen Chua Bee, Lin Chua Figiel, Adam Chien, Hwa Chong Wojdylo, Aneta Szumny, Antoni Shean, Thomas Yaw Choong The preservation of active constituents in fresh herbs is affected by drying methods. An effective drying method for Strobilanthes crispus which is increasingly marketed as an important herbal tea remains to be reported. This study evaluated the effects of conventional and new drying technologies, namely vacuum microwave drying methods, on the antioxidant activity and yield of essential oil volatiles and phytosterols. These drying methods included convective drying (CD) at 40 ◦C, 50 ◦C, and 60 ◦C; vacuum microwave drying (VMD) at 6, 9, and 12 W/g; convective pre-drying and vacuum microwave finish drying (CPD-VMFD) at 50 ◦C and 9 W/g; and freeze-drying (FD). GC–MS revealed 33 volatiles, and 2-hexen-1-ol, 2-hexenal, 1-octen-3-ol, linalool, and benzaldehyde were major constituents. The compounds β-sitosterol and α-linolenic acid were the most abundant phytosterol and fatty acid, respectively, in fresh S. crispus. The highest phenolic content was achieved with CD at 60 ◦C. The highest antioxidant activity was obtained with CD at 40 ◦C and VMD at 9 W/g. On the contrary, the highest total volatiles and phytosterols were detected with CD at 50 ◦C and VMD at 9 W/g, respectively. This study showed that CD and VMD were effective in producing highly bioactive S. crispus. A suitable drying parameter level, irrespective of the drying method used, was an important influencing factor. Multidisciplinary Digital Publishing Institute 2019 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/80680/1/PHYTO.pdf Yen, Lisa Wen Chua and Bee, Lin Chua and Figiel, Adam and Chien, Hwa Chong and Wojdylo, Aneta and Szumny, Antoni and Shean, Thomas Yaw Choong (2019) Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods. Molecules, 24 (7). pp. 1-21. ISSN 1420-3049 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480187/pdf/molecules-24-01397.pdf 10.3390/molecules24071397 |
| spellingShingle | Yen, Lisa Wen Chua Bee, Lin Chua Figiel, Adam Chien, Hwa Chong Wojdylo, Aneta Szumny, Antoni Shean, Thomas Yaw Choong Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods |
| title | Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods |
| title_full | Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods |
| title_fullStr | Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods |
| title_full_unstemmed | Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods |
| title_short | Antioxidant activity, and volatile and phytosterol contents of Strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods |
| title_sort | antioxidant activity and volatile and phytosterol contents of strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods |
| url | http://psasir.upm.edu.my/id/eprint/80680/1/PHYTO.pdf |
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