Przeglądaj wg Autor "Janda, Katarzyna"

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  • Miniatura
    PozycjaOpen Access
    Badania składu ilościowego i jakościowego grzybów zasiedlających nasiona rzepaku
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2014) Janda, Katarzyna; Markowska-Szczupak, Agata; Zakład Biochemii i Żywienia Człowieka, Pomorski Uniwersytet Medyczny w Szczecinie; Zakład Biotechnologii, Zachodniopomorski Uniwersytet Technologiczny w Szczecinie
    The aim of study was estimated of qualitative and quantitative composition of fungi in rapeseed on RBA, YpSs, DG18 medium at 25, 37, 45ºC. Material was 18 samples of rapeseed. The most amount of fungi were isolated on RBA at 25ºC (28), next xerophilic species (23) on DG 18 at 25oC and mesophilic (19) and thermophilic species (8) on YpSs medium at 37º and 45ºC, respectively. The predominant species were Penicillium chrysogenum and Eurotium herbariorum. From rapeseed 162 strains belonging to 41 species were isolated. This study enriched rapeseed mycobiota about 25 species and genus of fungi in comparison to date from available literature.
  • Miniatura
    PozycjaOpen Access
    The effect of water activity and temperature on the growth and lipolytic activity of Penicillium chrysogenum (Thom) and Eurotium herbariorum (Wigg.) strains
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2016) Janda, Katarzyna; Markowska-Szczupak, Agata; Ulfig, Krzysztof; Department of Biochemistry and Human Nutrition, Pomeranian Medical University in Szczecin; Institute of Inorganic Technology and Environment Engineering, West Pomeranian University of Technology, Szczecin; School of Public Health, Medical University of Silesia, Bytom
    The aim of the study was to determine the effect of water activity (aw) and temperature on the growth and tributyrin hydrolysis of Penicillium chrysogenum and Eurotium herbariorum strains isolated from rape, soya-bean and sunflower seeds. The study demonstrated differences in daily growth rates, tributyrin hydrolysis zones and tributyrin hydrolysis indices in different strains of the same species; depending on the seeds they had been isolated from. E. herbariorum strains, unlike P. chrysogenum strains, did not grow on tributyrin at 15°C and 0.850 aw. No hydrolysis zones of oil substrate were found under these conditions. E. herbariorum and P. chrysogenum showed marked differences in their tributyrin hydrolysis indices. For P. chrysogenum strains somewhat higher values were recorded for cultures at 15°C. However, the highest indices of tributyrin hydrolysis at 15°C and 25°C were recorded at the lowest level of aw 0.850.
  • Miniatura
    PozycjaOpen Access
    Physico-chemical characteristics of selected honeys of the West Pomeranian province and the value of their pro-health
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2016) Szczuko, Małgorzata; Krzemianowska, Ewa; Janda, Katarzyna; Wolska, Jolanta; Jamioł-Milc, Dominika; Department of Biochemistry and Human Nutrition, Pomeranian Medical University in Szczecin
    Recently there have been many studies on positive effect of honeys on various diseases, especially in treatment of cardiovascular diseases. Even though the majority of results suggest positive influence in the treatment of those diseases the authors of those research wanted to indicate other aspects, often negative, connected to the consumption of honey available at retail. The performed study relates to the adulteration of 35 natural honeys obtained from private apiaries and at retail. The honeys were subjected to the quality tests PN-88/A- 77626 on the presence of saccharose (Lane-Eynon’s method), starch, artificial acidic and basic dyes, water (refractometric method), total acidity and antioxidative activity (spectrophotometric method). Among the tested honeys more than 50% contained more than 10% of saccharose, and the relation between higher saccharose content and the presence of lower acidity in honey was determined, what will have unfavorable influence on antibacterial properties. Also lowered antioxidative activity of honeys was observed – within the range of 10.32–80.56 percent of inhibition of DPPH radicals and relatively high water content in 17% honeys, what will negatively affect the microbial stability of the product. The presence of starch and synthetic dyes in honey samples were not determined. It is postulated to maintain caution in nutrition honey with no approved quality of the chronically ill.
  • Miniatura
    PozycjaOpen Access
    Wpływ aktywności wody i temperatury na wzrost oraz aktywność lipolityczną kserofilnego grzyba Eurotium herbariorum (Weber ex F.H. Wigg.) Link
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2014) Janda, Katarzyna; Markowska-Szczupak, Agata; Zakład Biochemii i Żywienia Człowieka, Pomorski Uniwersytet Medyczny w Szczecinie; Zakład Biotechnologii, Zachodniopomorski Uniwersytet Technologiczny w Szczecinie
    Eurotium herbariorum (Weber ex F.H. Wigg.) Link strains isolated from rapeseed, soybean and sunflower seed were incubated on liquid medium with oils, adequately, rapeseed oil, soybean oil and sunflower oil. Influence of water activity (aw) of medium (0.995; 0.950; 0.900 and 0.850) and temperature (15º and 25ºC) on dry mass, proteins content and lipolytic activity were studied. Irregardless of oil type, protein content achieved by Eurotium herbariorum (Weber ex F.H. Wigg.) Link strains on medium of water activity in the range between 0,900 and 0,995 at 25ºC were higher that at 15ºC. The study proved, that all strains were able to biosynthesis lipolytic exoenzymes on liquid medium with oils. Lipolytic activity was higher at 15ºC than at 25ºC.This indicates that presence Eurotium herbariorum (Weber ex F.H. Wigg.) Link strains in oilseeds may to initiate disadvantageous quality changes of oils.
  • Miniatura
    PozycjaOpen Access
    Zależności pomiędzy wybranymi cechami jakościowymi nasion słonecznika a ich zasiedleniem przez grzyby
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2014) Janda, Katarzyna; Markowska-Szczupak, Agata; Zakład Biochemii i Żywienia Człowieka, Pomorski Uniwersytet Medyczny w Szczecinie; Zakład Biotechnologii, Zachodniopomorski Uniwersytet Technologiczny w Szczecinie
    There is lack of work in which correlation between chosen qualitative features of sunflower seeds and settled of the fungi colonies have been investigated. The study was aimed to evaluate selective qualitative characteristics of sunflower seeds, to determine the quantitative analysis of fungi including different media and temperature incubation and to specify the correlation between sunflower seed's qualitative characteristics and the number of colonies of fungi that inhabit them. Investigated material of sunflower seeds was 20 samples of seeds. The characteristics of seeds included calculation of thousand seed weights, volumetric weight, amount, pH of seeds, seeds moisture content, seeds water activity (aw), fat content, fat acidity, critical moisture of seeds and hull content. Number of fungi contaminating sunflower seeds were investigated with using different culture media (RBA, DG18, YpSs) and incubation temperatures (25ºC, 37ºC and 45ºC). The largest number of fungi colonies was isolated when DG18 medium was used at 25ºC. The negative correlations between volumetric weight and amount of fungi has been revealed. The negative statistically significant correlation between pH of seeds and amount of fungi isolated on YpSs at 37ºC was found. The positive, statistically significant correlations between amount of fungi colonies isolated on YpSs at, respectively 37ºC and 45ºC and water activity and humidity and fat acidity, has been revealed. Received correlations proved, that contamination seeds by fungi may cause decrease of volumetric weight and pH of seeds. This results demonstrated, that large colonies of fungi is directly related with count of impurities.