1H-NMR-based metabolomics approach to understanding the drying effects on the phytochemicals in Cosmos caudatus
medicinal herb to treat several maladies. Proton nuclear magnetic resonance (1H-NMR) combined with principal component analysis (PCA) and partial least-squares analysis (PLS) was applied to distinguish variations among C. caudatus materials processed with various drying techniques. A discriminator...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2012
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/33293/ http://irep.iium.edu.my/33293/ http://irep.iium.edu.my/33293/ http://irep.iium.edu.my/33293/2/Mediani_et_al._2012.pdf |
| Summary: | medicinal herb to treat several maladies. Proton nuclear magnetic resonance (1H-NMR) combined with principal
component analysis (PCA) and partial least-squares analysis (PLS) was applied to distinguish variations
among C. caudatus materials processed with various drying techniques. A discriminatory report on the metabolites
responsible for the variation between air (AD), oven (OD) and freeze (FD) dryings of C. caudatus samples
was successfully achieved using 1H-NMR-based metabolomics. The correlation between antioxidant
activity (AA) represented by radical DPPH scavenging activity and metabolite variation among processed samples
dried in three different ways was also determined by partial least-squares analysis (PLS). The PCA and PLS
scores showed a noticeable and clear separation into three clusters representing the three drying methods by
PC1 and PC2, with an eigenvalue of 77.9%. Various assigned 1H-NMR chemical shifts referring to themetabolites
responsible for sample variation were ascribed. The identified compounds were β- and α-glucose, chlorogenic
acid, catechin, rutin, quercetin, quercetin 3-O-rhamnoside, quercetin 3-O-β-arabinofuranoside and quercetin
3-O-β-glucoside. This research demonstrates thatmost of the identified compounds were present in all samples
from the three processing methods. However, there was marked variance in the concentration of the constituents
present. |
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