Aysel ÖZCAN, Emine YURTERI, Fatih SEYİS TOTAL PHENOLIC CONTENT AND ANTIOXYDANT ACTIVITY OF RHODODENDRON SPECIES COLLECTED FROM THE RİZE PROVINCE


ÖZCAN A. , YURTERİ E., SEYİS F.

VII International Scientific Agriculture Symposium "Agrosym 2016",, Saray Bosna, Bosnia And Herzegovina, 6 - 09 September 2016, pp.1019-1024

  • Publication Type: Conference Paper / Full Text
  • City: Saray Bosna
  • Country: Bosnia And Herzegovina
  • Page Numbers: pp.1019-1024

Abstract

Abstract Rhododendron species (mountain laurel) are deciduous or evergreen shrubs commonly used as garden plants worldwide. Six Rhododendron species, one of which (R. smirnovii) is endemic, grow naturally in Turkey, especially in the northeastern Anatolia (Black Sea region). Turkish Rhododendron species grow naturally from sea level to altitudes of 2500 (3100) m. They take the form of shrubs (R. luteum Sweet), dwarf shrubs (R. caucasicum Pallas) and large shrubs (R. ponticum L., R. ungernii Trautv., R. smirnovii Trautv.). Rhododendron samples obtained from Rize province (Turkey) were screened for total phenolic content by the modified Folin–Ciocalteu method, for potential antioxidant activity using phospho-molybdenum assay and by the 1,1- diphenyl-2-picryl hydrazyl (DPPH) and FRAP method for antiradical activity. Total phenolic content and antioxidant activity plant parts (flower, leaf) of two Rhododenron sepecies, namely Rhododendron luteum L. and Rhododendron ponticum L. were determined. The total phenolic content of leaves of Rhododendron luteum L. collected from different altitudes ranged between 112,363 and 219,071 mg GAE/gr DW. Total phenolic content of flower parts of the same species ranged between 82,275 and 201,642 mg GAE/gr DW. The total phenolic content of different parts of Rhododendron ponticum L. were higher compared with Rhododendron luteum L. On the other side, the antioxidant activity values of leaf parts of Rhododendron luteum L. were lower compared with flower parts and like the phenolic content the antioxidant activity values of Rhododendron ponticum L. parts were higher compared with Rhododendron lutem L. Keywords: Rhododendron, phenols, antioxidant activity