Wroclaw University of Environmental and Life Sciences

About: Wroclaw University of Environmental and Life Sciences is a education organization based out in Wrocław, Poland. It is known for research contribution in the topics: Population & GNSS applications. The organization has 3108 authors who have published 6672 publications receiving 57774 citations.

Characterization of Phenolic Compounds of Thorny and Thornless Blackberries

Abstract: The aim of this study was to identify and compare the contents of phenolic acids, tannins, anthocyanins, and flavonoid glycosides in thorny and thornless blackberries. Five thorny and nine thornless cultivars were used for this study. Thirty-five phenolic compounds were determined in the examined fruits, and one phenolic acid, three ellagic acid derivatives, one anthocyanin, and six flavonols were characterized for the first time in blackberries. The thornless fruits were characterized by a higher content of anthocyanins (mean = 171.23 mg/100 g FW), ellagitannins (mean = 3.65 mg/100 g FW), and ellagic acid derivatives (mean = 2.49 mg/100 g FW), in comparison to thorny ones. At the same time, in thorny fruits, the contents of hydroxycinnamic acids (mean = 1.42 mg/100 g FW) and flavonols (mean = 5.70 mg/100 g FW) were higher.

Zachowania konsumentów na rynku mięsa drobiowego

Abstract: S t r e s z c z e n i e W pracy przedstawiono wyniki badan czynnikow determinujących wybor i spozycie miesa drobiowego. W badaniach zastosowano wywiady bezpośrednie z uzyciem kwestionariusza zawierającego pytania otwarte dotyczące kryteriow wyboru miesa drobiowego, atrybutow jego jakości oraz zwyczajow zakupowych i konsumpcyjnych. Przeprowadzono 386 wywiadow. Probe dobrano celowo wedlug schematu kwotowego, uwzgledniając plec i wiek respondentow. Z analizy odpowiedzi wynika, ze: kryteria zakupu miesa drobiowego stanowily smak, wartośc odzywcza, krotki okres przygotowania; ponad polowa ankietowanych nie byla w stanie podac atrybutow jakości miesa drobiowego, a pozostali wskazali na jego świezośc i odpowiedni wygląd; 90 % nie bylo zainteresowanych identyfikacją producenta miesa, a glownymi powodami jego spozywania byly wartośc kaloryczna i dietetyczna oraz latwośc przygotowania. Slowa kluczowe: mieso drobiowe, zwyczaje zakupowe i konsumpcyjne, jakośc

Phenolic compounds and antioxidant activity of twelve grape cultivars measured by chemical and electrochemical methods

Abstract: Five red (Rondo, Cabernet carol, Merlot, Pinot noir, Cabernet sauvignon), five white (Solaris, Riesling, Johanniter, Aurora, Saphira), and two pink (Freiminer, Gewurztraminer) grape cultivars were investigated. The phenolic content was determined by liquid chromatography–mass spectrometry quadrupole time-of-flight (LC-MS QTof) and ultra-performance liquid chromatography-photodiode array-fluorescence (UPLC-PDA-FL); and the antioxidant activity by two spectrophotometric methods: oxygen radical absorbance capacity (ORAC) and 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS°+), and by cyclic voltammetry (CV). The aim of this study was to determine profile of phenolic compounds of popular cool climate grape cultivars and their antioxidant potential. The used methods were compared and correlations were established between investigated parameters. Total phenolic content ranged from 1354.6 mg/100 g in dry weight (d.w). for Aurora to 4567.9 mg/100 g d.w. for Rondo. Highest antioxidant activity was observed in red cultivars Rondo, Merlot and Pinot noir (24.4, 23.6 and 21.3 mmolTrolox/100 g d.w., ABTS°+ assay), while in pink and white cultivars results not exceeded 20 mmolTrolox/100 g d.w. The aforementioned affect in red grapes was associated with their higher content of phenolic compounds, and the presence of an additional group, i.e. anthocyanins. Cyclic voltammetry measurements of redox potential of phenolics confirmed the results achieved by traditional methods of evaluating antioxidant activity. Red cultivars had the highest anodic curve area.