Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 47, Issue -, Pages 106-112Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2013.02.007
Keywords
Essential oils; Polyphenolics; Antioxidant capacity; S. argentea; By-products; Methanolic extracts
Categories
Funding
- Tunisian Ministry of Higher Education, Scientific Research and Technology
- European Social fund
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The objective of this study was to examine the chemical composition of essential oils and polyphenolics and to evaluate the antioxidant capacity of S. argentea by-products. Fourty seven compounds, representing (90.13,92.00%) of the total oil, were identified. The major components were showed to be viridiflorol (18.75,26.93%), manool (6.15,13.59%), alpha-thujone (7.30,8.06%), p-cymene (4.17,6.39%) and alpha-humulene (4.13,5.28%). Post-distilled dry plants were considered for HPLC analysis and antioxidant capacities estimation. S. argentea methanolic extracts from both collection sites (Sers and Makther) were dominated by methyl carnosate (1377.03, 715.41 mu g/g DW), rosmarinic acid (941.81, 613.25 mu g/g DW) and naringenin (432.00, 356.101 mu g/g DW). Higher antioxidant activity was observed in S. argentea post-distilled samples collected in Sers, as assessed by DPPH, ABTS, FRAP. Significant correlations were detected between several phenolic compounds, total phenolic amounts and the DPPH and FRAP assays. Variations in volatile compounds, phenolics and antioxidant capacity were significant between the two analyzed collection sites. (C) 2013 Elsevier B.V. All rights reserved.
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