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Search: authors:"Krystyna Pyrzynska"

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Mineral Composition of Wild and Cultivated Blueberries

The concentrations of 13 elements (Al, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) were determined in several samples of native (wild) naturally growing and cultivated blueberry fruits. The total metal contents after mineralization were analyzed by inductively coupled plasma optical emission spectrometry. Reliability of the procedure was checked by the analysis of the ...

Evaluation of Aluminium Complexation Reaction for Flavonoid Content Assay

Anna Pkal Krystyna Pyrzynska 0 ) Department of Chemistry, University of Warsaw , Pasteura 1, 02-093 Warsaw, Poland Two widely applied spectrophotometric assays based on aluminium complex formation ... flavones family). Conflict of Interest Anna Pkal has no conflict of interest. Krystyna Pyrzynska has no conflict of interest. Our article does not contain any studies with human or animals subjects. Open

Evaluation of the antioxidant properties of fruit and flavoured black teas

Objective Antioxidant properties of the water extracts of the commercial bagged fruit and flavoured black teas were evaluated and compared with typical black teas of C. sinensis. Methods Folin–Ciocalteu (FC) assay, cupric ion reducing antioxidant capacity (CUPRAC) and DPPH radical method were used for these purposes. The content of selected flavonoids and phenolic acids was also ...