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(A). DPPH free radical scavenging activity of the essential oils. (x) T. vulgaris; (·) C. aurantium; (■) C. sempervirens; (▲) E. globulus; (○) C. limon; (□) F. vulgare; (B). DPPH free radical scavenging activity of the standards. (x) Thymol; (○) Carvacrol.
