Resveratrol (trans-3,5,4′-trihydroxystilbene) is a phytoalexin produced by grapevines in response to fungal infection, particularly to Botrytis cinerea. It has been shown that it possess various biological effects such as prevention of cardiovascular diseases and anti-inflammatory and anticancerogenic properties. Red wines are a primary source of resveratrol. Although a number of investigations have focused on the determination of resveratrol in wines of different countries, there is no similar study about the wines produced in Serbia. As authors are aware, the only study concerning resveratrol content in wine in the Balkan region was conducted in Greece. In this study, the trans- and cis-resveratrol content in samples obtained from 18 commercial Serbian wines (10 red, 7 white, and 1 rose) were analyzed. Analyses were performed after solid-phase extraction by high-performance liquid chromatography with a diode array detection system using an RP-C¹⁸ column with gradient elution [solvent A: acetonitrile-acetic acid-water (20:2:78 v/v), solvent B: acetonitrile-acetic acid-water (90:2:8 v/v)]. Detection of trans- and cis-resveratrol was performed on 306 and 286 nm, respectively. It was clearly established that there was a presence of trans-resveratrol isomers in all analyzed wines (0.11–1.69 mg/L) except in one white wine. Cis-resveratrol was present in 12 from 18 samples in different amounts (0.12–1.49 mg/L).

The aim of this study was to evaluate the effect of high selenium (Se) concentrations on morphophysiological and ultrastructural properties ofPleurotus ostreatus. Mycelium growth was good in media enriched with 5.0, 10.0, and 20.0 mg L⁻¹of Se, concentration of 500.0 mg L⁻¹strongly inhibited growth, and 1000.0 mg L⁻¹was the minimum inhibitory concentration. Contrary to thin-walled, hyaline, branched, and anastomized hyphae with clamp-connections in the control, at Se concentrations of 100.0 and 500.0 mg L⁻¹, they were noticeably short, frequently septed and branched, with a more intensive extracellular matrix, and without clamp-connections. At high Se concentrations, hyphae with intact membrane, without cellular contents, with a high level of vacuolization, and with numerous proteinaceous bodies were observed. Biomass yield ranged between 11.8 g L⁻¹, in the control, and 6.8 g L⁻¹, at an Se concentration of 100.0 mg L⁻¹, while no production was detected at a concentration of 500.0 mg L⁻¹. Se content in the mycelia reached a peak (938.9 μg g⁻¹) after cultivation in the medium enriched with Se at the concentration of 20.0 mg L⁻¹, while the highest absorption level (53.25%) was found in the medium enriched with 5.0 mg L⁻¹Se.