@conference{
author = "Milutinović, Violeta and Ušjak, Ljuboš and Stanojković, Tatjana and Đorđić Crnogorac, Marija and Niketić, Marjan and Petrović, Silvana",
year = "2018",
abstract = "Pyrus × velenovskyi Dostálek (Rosaceae) [P. pyraster (L.) Burgsd. × P. spinosa Forssk.] is a deciduous tree up to 5 m height. Leaf-blades 2.2–4.8 × 1.3–2.7 cm, ± glabrate, ellip tic, gradually narrowed to a rather long petiole. Th is natural hybrid plant was described from Bulgaria, and has been also found in Serbia. The objective of this work was to investigate the phenolic profile, as well as in vitro antioxidant, α-amylase and α-glucosidase inhibitory activities of dried methanol ex tract from the bark of this tree. The plant material was collected in eastern Serbia (Jelašnička Klisura gorge). In the dried bark, the contents of different classes of phenolics were spectrophotometrically determined: total polyphenols (10.36%), tannins (8.78%), procyanidins (4.21%) and phenolic glycosides (3.54%). After pre-extraction with dichloromethane, powdered bark was extracted with methanol by bimaceration at room temperature. In obtained dried methanol extract, using aforementioned spectrophotometric tests, the contents of total polyphenols (33.42%) and tannins (21.55%) were determined, and by HPLC, arbutin, chlorogenic acid, catechin and procyanidin B2 were identifi ed. Its antioxidant activity, i.e. ferric reducing capacity (FRAP), 2,2-diphenyl-1-picrylhydrazyl (DPPH) and OH radical scavenging ability, as well as the inhibition of the enzymes α-amylase and α-glucosidase were assessed using corresponding colorimetric assays. Tested dried methanol extract exhibited signifi cant DPPH and OH radical scavenging abilities (SC50 = 6.85 and 12.21 μg/mL, respectively), and ferric reducing capacity (10.74 mmol Fe (II)/g of dried extract), as well as the inhibition of α-amylase (IC50 = 11.4 μg/mL) and α-glucosidase (IC50 = 5.48 μg/mL).",
publisher = "Institute of Botany and Botanical Garden Jevremovac, Belgrade",
journal = "Botanica Serbica, The 7th Balkan Botanical Congress – 7BBC 2018, Book of abstracts",
title = "Phenolic constituents, antioxidant, α-amylase and α-glucosidase inhibitory activities of Pyrus × velenovskyi bark",
volume = "42",
number = "1 supplement",
pages = "139-139",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5258"
}