Abstract
Changes in the contents and composition of polyphenolics and resulting antioxidant activities of S. verbenaca by-products were investigated at three phenological stages (flowering, early fruiting and late fruiting stages). The highest accumulation of total phenolics was detected at the flowering stage (58.36 mg GAE/g DW). HPLC analysis of methanolic extracts showed the prevalence of methyl carnosate (821.45–919.82 μg/g DW) and rosmarinic acid (544.51–649.26 μg/g DW). Phenolic diterpenes (1056.90–1148.42 μg/g DW) was the most represented class of compounds. Three complementary tests namely, DPPH• (IC50 value, 49.22 μg/mL) and ABTS•+-radical scavenging assays (146.86 μM TE/mg) and FRAP reducing power test (188.93 mM Fe(II)/mg) were used to evaluate the antioxidant capacity and showed the best performance at the early fruiting period. The current study evidenced the significant effect of phenophase on antioxidants and contributed to valorize S. verbenaca extracts as a source of functional phenolic compounds.
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Abbreviations
- ABTS:
-
2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt
- DPPH:
-
2,2-Diphenyl-1-picrylhydrazyl
- DW:
-
Dry weight
- FRAP:
-
Ferric reducing antioxidant power
- GAE:
-
Gallic acid equivalents
- HPLC:
-
High-performance liquid chromatography
- IC50 :
-
Inhibitory concentration
- TE:
-
Trolox equivalent
- TEAC:
-
Trolox equivalent antioxidant capacity
- TPTZ:
-
2,4,6-tripyridyl-s-triazine
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Acknowledgments
This work was supported by the Tunisian Ministry of Higher Education, Scientific Research and Technology and the European Social fund. The authors are thankful to Prof. Jalila Chérif for English language corrections.
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The authors declare that they have no conflict of interest.
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Ben Farhat, M., Chaouch-Hamada, R., Sotomayor, J.A. et al. Antioxidant Properties and Evaluation of Phytochemical Composition of Salvia verbenaca L. Extracts at Different Developmental Stages. Plant Foods Hum Nutr 70, 15–20 (2015). https://doi.org/10.1007/s11130-015-0466-9
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DOI: https://doi.org/10.1007/s11130-015-0466-9