The impact of bread making and baking procedure on rutin, quercetin and polyphenol concentration and antioxidant activity of tartary buckwheat (Fagopyrum tataricum) bread and breads made of mixtures of tartary buckwheat and wheat flour was studied. A decrease in polyphenol concentration through baking was observed in all samples. The high DPPH (2,2-diphenyl-1-picrylhydrazyl) scavenging capacity in mixed breads (32-56%) and in tartary buckwheat bread (85-90%) decreased slightly through the bread making process, while an increase of antioxidant activity in bread made of 100% wheat flour during bread making was observed. With the addition of water to mixtures containing tartary buckwheat during the preparation of the dough, rutin concentration decreased, while quercetin concentration increased. The rutin concentration continued to decrease during the bread baking process, while the concentration of quercetin remained stable. After baking, rutin (0.47 mg/g) was present only in bread made of 100% tartary buckwheat flour along with quercetin (4.83 mg/g).

In present study the quantification of total phenolics content (TPC), total antioxidant activity (TAA) and their relation in sweet and tart cherries were studied. Aqueous and pure polar solvents were used to compare the yield of present phenolic compounds in prepared extracts. The solubility of phenolics was the most effective in sweet cherry extracts with using of 50 % methanol and in tart cherry extracts with using of 50 % acetone. The yield of TPC of both tested cherry fruit extracts was higher with pure methanol in comparison to pure acetone. Substantial TPC assessed with Folin-Ciocealteu assay in tart cherry extracts were in range from 70.6±8.46 mg to 241.4±7.26 mg GAE/100 g FW. Extracts from lyophilised tart cherries (methanolic and water-acetone mixtures) contain in average 2-times higher amount of polyphenols than ethanol extracts. The DPPH antiradical efficiency values of the both tested fruit extracts were higher in extracts of tart cherries (from 5.4 to 9.9 % of inhibition of DPPH radical) when compared to those of sweet cherries (from 2.4 to 3.5 % of inhibition of DPPH radical). Total antioxidant activity (TAA) of sweet cherry extracts (using 70 % ethanol and with 70 % methanol) and of tart cherry extracts (with 50 % methanol) depended on phenolics content.

Abstract:The of relation between chosen macro-and microelements, total polyphenol (TP) and anthocyanin content (TA) and antioxidant capacity (TAC) in 6 selected cultivars of cranberries (Sussi, Linnea, Sanna, Runo Bielawski, Ida, Koralle) is the aim of this study. The influence of cultivars on macro-and microelements content was confirmed. The Mg content was in interval 478.3-555.2 mg/kg, K 5690-7690 mg/kg, Fe 10.7-29.3 mg/kg, Cr 0.5-0.8 mg/kg, Cu 3.5-5.0 mg/kg and Zn 8.1-9.8 mg/kg. The lowest Mg, Cr, and Cu contents were determined in cultivar Ida with the highest TP and TA contents. TA contents in observed cultivars were in interval 221.778-498.503 mg/kg, TP contents 1394.32-1605.62 mg/kg TAC 63.58%-68.13%. The statistically significant differences of all observed parameters among cranberry cultivars (P < 0.05) were confirmed. Also the positive correlations of TAC and TP as well as TA contents were significant. TP content is in the positive correlation with TA content.

increased content of cadmium and lead in soil was manifested by their increased concentration in potato tubers in such range that contents were several times higher (cd 0.106-0.357, Pb 0.318-0.483 mg.kg -1 FM) then the limit value. increased content of zinc was not manifested by increased content in tubers of potatoes (Zn 4.939-6.868 mg.kg -1 FM). content of total phenolics (TP) in potato samples of hontiansky and Banskoštiavnický region was in the range of 263.59-920.38 mg.kg -1 of dry material. exceeded content of cadmium and lead in potato tubers had statistically significant effect on total phenol producing, but on the other hand relation between contents of Zn and TP in potato tubers was not statistically confirmed. Also positive correlation between TP and antioxidant activity contents was statistically confirmed. AbstraktZvýšené obsahy kadmia a olova v pôde sa prejavili ich zvýšenou koncentráciou v hľuzách zemiakov v takom rozsahu, že ich obsahy boli niekoľko násobne vyššie (cd 0.106-0.357, Pb 0.318-0.483 mg.kg -1 čh) ako limitná hodnota. Zvýšený obsah zinku sa neprejavil zvýšeným obsahom v hľuzách zemiakov (Zn 4.939-6.868 mg.kg -1 čh). obsah celkových fenolov (cP) vo vzorkách zemiakov z hontianskeho a Banskoštiavnického regiónu bol v rozmedzí od 263.59 do 920.38 mg.kg -1 sušiny. Zvýšený obsah kadmia a olova v zemiakových hľuzách mal štatisticky významný vplyv na produkciu celkových fenolov, ale naopak, vzťah medzi obsahmi Zn a cP neboli štatisticky potvrdené. Avšak pozitívna korelácia medzi cP a antioxidačnou aktivitou bola štatisticky preukazná.

Abstract:The changes of vitamin C content in relation to Cd, Pb and Zn accumulation in 6 potatoes varieties: very early (Junior, Impala), early (Livera), middle early (Agria), medium-late (Asterix, Desirée) were surveyed in this work.