Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
 
Articles by Ilkay Orhan
Total Records ( 2 ) for Ilkay Orhan
  Ilkay Orhan , Betul Demirci , Iman Omar , Huma Siddiqui , Erdal Kaya , M. Iqbal Choudhary , Gulay Ecevit-GenC , Neriman ozhatay , Bilge Sener and K. Husnu Can Baser
  Essential oil compositions and antioxidant potentials of fourteen ethanol (75%) root extracts prepared from twelve taxa of the genus Paeonia (Paeoniaceae), including P. arietina Anders., P. daurica Andrews, P. xkayae N. Özhatay, P. kesrouanensis Thiéb., P. mascula (L.) Miller subsp. arasicola G. Kaynak, ö. Yilmaz & R. Daşkin, P. mascula (L.) Miller subsp. bodurii N. Özhatay, P. cf. mascula L. (Mill.) subsp. mascula (two samples from central and northeastern Anatolia), P. cf. officinalis Retz., P. peregrina Miller (two samples from western and northwestern Anatolia), P. tenuifolia L., P. turcica Davis & Cullen, and P. wittmanniana Hartwiss ex Lindl. were assessed. The chromosome numbers of the root tips of the species were examined using chromosome staining technique with Shiff’s reagent under Leitz microscope. The essential oils of the roots of the Paeonia species were analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) and the major components were identified as salicylaldehyde (10%–94.4%), cis-myrtanal (5.5%–59.7%), and methyl salicylate (2%–52.2%). Antioxidant potentials were tested against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and nitric oxide (NO) radicals using propyl gallate and rutin as the references. Total phenolic contents of the ethanol extracts were determined using Folin-Ciocalteau’s method. The extracts exerted moderate NO scavenger effect and displayed insignificant DPPH radical scavenger activity at 500 μg mL−1. On the other hand, P. daurica, P. tenuifolia and P. cf. mascula subsp. mascula are diploids with 2n=10, while other nine taxa are tetraploids with 2n = 20.
  Fatma Sezer Senol , Gulderen Yilmaz , Bilge Sener , Mehmet Koyuncu and Ilkay Orhan
  The ethyl acetate and methanol extracts prepared from the fruits, aerial parts, and roots of Heptaptera anatolica (Boiss.) Tutin, (Umbelliferae), H. anisoptera (DC.) Tutin, H. cilicica (Boiss. & Balansa) Tutin (endemic), and H. triquetra (Vent.) Tutin were tested for their acetylcholinesterase (AChE) inhibitory and antioxidant activities. AChE inhibition was evaluated using ELISA microplate reader at 500, 1000, and 2000 μg mL−1. Antioxidant activity was determined by 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging test and Fe+2-ferrozine test system for metal chelating power at the same concentrations. Total phenol contents of the extracts were determined using Folin-Ciocalteu reagent. At 2000 μg mL−1, only the aerial parts and fruits of H. anatolica showed moderate anti-AChE effect (61.97% and 49.80%, respectively), while the aerial parts and fruits of H. triquetra had the highest DPPH scavenging effect (80.48% and 86.19%, respectively). All of the methanol extracts exhibited significant ferrous ion-chelating effect varying between 72.97% and 92.36%, whereas only four of the ethyl acetate extracts exerted chelating effect over 70%. These results indicate that Heptaptera species could be a good source for antioxidant compounds.
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility