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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...

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Main Authors: Yen, Lisa Wen Chua, Bee, Lin Chua, Figiel, Adam, Chien, Hwa Chong, Wojdylo, Aneta, Szumny, Antoni, Shean, Thomas Yaw Choong
Format: Article
Language:English
Published: Multidisciplinary Digital Publishing Institute 2019
Online Access:http://psasir.upm.edu.my/id/eprint/80680/1/PHYTO.pdf
http://psasir.upm.edu.my/id/eprint/80680/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480187/pdf/molecules-24-01397.pdf
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spelling my.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
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
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.
format Article
author Yen, Lisa Wen Chua
Bee, Lin Chua
Figiel, Adam
Chien, Hwa Chong
Wojdylo, Aneta
Szumny, Antoni
Shean, Thomas Yaw Choong
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
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
title 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_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_sort antioxidant activity, and volatile and phytosterol contents of strobilanthes crispus dehydrated using conventional and vacuum microwave drying methods
publisher Multidisciplinary Digital Publishing Institute
publishDate 2019
url http://psasir.upm.edu.my/id/eprint/80680/1/PHYTO.pdf
http://psasir.upm.edu.my/id/eprint/80680/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480187/pdf/molecules-24-01397.pdf
_version_ 1684654756626169856
score 13.211869

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