Abstract
The impact of tropical seasons (dry and wet) and growth stages (8, 10 and 12 weeks) of Cosmos caudatus on the antioxidant activity (AA), total phenolic content (TPC) as well as the level of bioactive compounds were evaluated using high performance liquid chromatography (HPLC). The plant morphology (plant height) also showed variation between the two seasons. Samples planted from June to August (during the dry season) exhibited a remarkably higher bioactivity and height than those planted from October to December (during the wet season). The samples that were harvested at eight weeks of age during the dry season showed the highest bioactivity with values of 26.04 g GAE/100 g and 22.1 μg/ml for TPC and IC50, respectively. Identification of phytochemical constituents in the C. caudatus extract was carried out by liquid chromatography coupled with diode array detection and electrospray tandem mass (LC-DAD-ESIMS/MS) technique and the confirmation of constituents was achieved by comparison with literature data and/or co-chromatography with authentic standards. Six compounds were indentified including quercetin 3-O-rhamnoside, quercetin 3-O-glucoside, rutin, quercetin 3-O-arabinofuranoside, quercetin 3-O-galactoside and chlorogenic acid. Their concentrations showed significant variance among the 8, 10 and 12-week-old herbs during both seasons.
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Abbreviations
- AA:
-
Antioxidant activity
- TPC:
-
Total phenolic content
- HPLC:
-
High performance liquid chromatography
- LC-DAD-ESIMS/MS:
-
Liquid chromatography coupled diode array detection and electrospray tandem mass spectrometry
- ROS:
-
Reactive oxygen species
- Na2CO3 :
-
Sodium carbonate
- DPPH:
-
Diphenylpicrylhydrazyl
- IC50 :
-
Half maximal inhibitory concentration
- GAE:
-
Gallic acid equivalent
- DW:
-
Dry weight
- DAD:
-
Diode array detector
- CID:
-
Collision-induced dissociation
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Acknowledgments
The authors wish to thank Universiti Putra Malaysia and Ministry of Science, Technology and Innovation (MOSTI) for the grant provided (grant no: 5450255). The authors (NHL) wishes to thank the Scientific Chairs Unit, Taibah University for its contribution.
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Table 3
Changes in metabolites concentration among growth ages and between seasons (DOC 32 kb)
Fig. 2
(a) Variation in the TPC of C. caudatus during the wet and dry seasons and from various growth ages (8, 10 and 12 weeks). (b) Variation in the radical scavenging activity of C. caudatus samples during the wet and dry seasons and from various growth ages (8, 10 and 12 weeks). Values are the mean ± standard deviation of nine replicates. a,b,c,d Each letter above the columns indicates that the results showed statistically significant (p < 0.05; n = 9) differences. (DOC 963 kb)
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Mediani, A., Abas, F., Ping, T.C. et al. Influence of Growth Stage and Season on the Antioxidant Constituents of Cosmos caudatus . Plant Foods Hum Nutr 67, 344–350 (2012). https://doi.org/10.1007/s11130-012-0317-x
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DOI: https://doi.org/10.1007/s11130-012-0317-x