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Wyświetlanie 1-6 z 6
Tytuł:
Antibacterial Effect of Sea Buckthorn (Hippophae rhamnoides L.) Fruit Extract on Radish Seeds Prior to Sprouting
Autorzy:
Rajkowska, Katarzyna
Rykała, Emilia
Czyżowska, Agata
Powiązania:
https://bibliotekanauki.pl/articles/31341110.pdf
Data publikacji:
2024-04-18
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
sea buckthorn fruit
antibacterial activity
radish seed decontamination
seed germination
phenolic compounds
Opis:
Sprouts consumption is increasing worldwide due to their nutritional and health benefits. However, they can be sources of foodborne bacterial diseases, including sprout-related outbreaks caused primarily by Shiga toxin-producing Escherichia coli and Salmonella spp. The aim of this study was to determine the efficacy of a dried sea buckthorn fruit extract in sanitization of contaminated radish seeds. The efficacy of 15-min seed treatment and 3-h soaking in the extract solution was evaluated in comparison to the treatment with 20,000 mg/L calcium hypochlorite, recommended by the U.S. Food and Drug Administration. The effect of the sea buckthorn fruit extract on radish seed germination capacity and the profile of phenolic compounds in the extract were also determined. Decontamination effect of the extract after a 15-min seed treatment ranged from 72.1% against Staphylococcus aureus to 93.0% against Listeria monocytogenes and was higher than that of active chlorine against E. coli, S. aureus and Salmonella enterica. Soaking seeds for 3 h in the extract increased the decontamination efficiency only against S. aureus (81.9%). Compared to water, after 4 days of sprouting, no significant differences were found in radish seed germination capacity and the length of roots and hypocotyls of sprouts. The sea buckthorn fruit extract had a high content of phenolic compounds, namely isorhamnetin 3-rhamnosylglucoside (12.99 mg/L), isorhamnetin 3-rutinoside (8.25 mg/L), protocatechuic acid (5.43 mg/L), isorhamnetin 3-glucoside (3.41 mg/L), and gallic acid (3.36 mg/L). The extract can be used as a substance limiting bacterial contamination of radish seeds and, as a result, sprouts, as well as a valuable source of phenolic compounds.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 120-129
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrophobic properties of Candida spp. under the influence of selected essential oils
Autorzy:
Rajkowska, Katarzyna
Kunicka-Styczyńska, Alina
Pęczek, Marlena
Powiązania:
https://bibliotekanauki.pl/articles/1038879.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Candida spp.
food-borne and clinical strains
hydrophobic properties
essential oils
Opis:
Processes of colonization of biotic and abiotic surfaces and biofilm formation depend inter alia on hydrophobic properties of Candida spp. The aim of this research was to determine the effect of tea tree, thyme and clove essential oils on hydrophobic properties of environmental and clinical Candida isolates. The relative cell surface hydrophobicity of strains tested was high, and ranged from 68.7% to 91.2%, with the highest value for a C. rugosa food-borne strain. The effectiveness of essential oils was diversified and depended on the type of essential oil, concentration and yeast strain. Statistically significant decrease of hydrophobicity indexes was observed after application of tea tree oil for C. krusei, clove oil for C. albicans reference strain, and all essential oils tested for C. rugosa. Only in the case of C. famata food-borne strain and C. albicans clinical isolate, solely used essential oils did not affect their hydrophobic properties. To determine the interactions of essential oils, their mixtures (1 MIC:1 MIC, 1 MIC:2 MIC and 2 MIC:1 MIC) were applied. Generally, essential oils used in combinations influenced yeast's hydrophobic properties much more than applied separately. The essential oils' mixtures reduced hydrophobicity of Candida yeasts in the range of 8.2 to 45.1%, depending on combination and strain. The interaction indexes of essential oils used in combinations predominantly indicate their additive effect. The application of tea tree, thyme and clove essential oils, especially in combinations, decreases hydrophobicity of the tested Candida isolates with implications of a probable advantageous limitation of their ability to colonize the food production industry environment.
Źródło:
Acta Biochimica Polonica; 2015, 62, 4; 663-668
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opportunistic Gram-negative rods capability of creating biofilm structures on polivynyl chloride and styrene-acronitrile copolymer surfaces
Autorzy:
Zabielska, Julia
Kunicka-Styczyńska, Alina
Rajkowska, Katarzyna
Tyfa, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1038901.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Pseudomonas aeruginosa
biofilm
environmental strains
polymer surfaces
Opis:
Biofilms are highly organized microbial communities displaying high resistance to disinfectants and other external environmental factors. Medical equipment, such as stents and catheters, can be colonized by a variety of bacteria including opportunistic pathogens circulating in the environment and dangerous to immunocompromised patients. Application of materials resistant to biofilm formation will minimize the risk of patients' infection. Hence, the aim of this research was to determine the biofilm growth of environmental bacteria isolates on polyvinyl chloride and styrene-acronitrile copolymer surfaces. Nine strains (Pseudomonas aeruginosa, Burkholderia cepacia and Serratia liquefacies) isolated from cosmetics, and a reference P. aeruginosa strain ATCC 15442, were tested. The ability and dynamics of biofilm formation on intubation catheters (30°C, up to 24 h) in bacterial growth cultures (107-108 CFU/ml) was investigated, with subsequent sonication and quantification by agar plate count method. The results indicated that all the tested bacteria expressed a strong ability for the polymer surface adhesion, reaching 4.6 to 6.7 log CFU/cm2 after 30 minutes. Moreover, for the majority of strains, the level of 24-hour biofilm production was from 6.67-7.61 log CFU/cm2. This research indicates that the environmental strains circulating between the cosmetics and patients may pose a threat of biofilm formation on medical equipment surfaces, and presumably in the clinical surroundings as well.
Źródło:
Acta Biochimica Polonica; 2015, 62, 4; 733-737
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of thyme and tea tree oils on morphology and metabolism of Candida albicans
Autorzy:
Rajkowska, Katarzyna
Kunicka-Styczyńska, Alina
Maroszyńska, Marta
Dąbrowska, Mariola
Powiązania:
https://bibliotekanauki.pl/articles/1039294.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Candida albicans
essential oils
morphology
metabolism
enzymatic activity
biochemical properties
Opis:
Members of Candida species cause significant problems in medicine and in many industrial branches also. In order to prevent from Candida sp. development, essential oils are more and more frequently applied as natural, non-toxic, non-pollutive and biodegradable agents with a broad spectrum of antimicrobial activity. The aim of the research was to determine changes in morphology and metabolic properties of Candida albicans in the presence of thyme and tea tree oils. Changes of enzymatic activity of isolates were observed in the presence of both tested essential oils, and they were primarily associated with loss or decrease of activity of all enzymes detected for control. Furthermore, only for 3 out of 11 isolates additional activity of N-acetyl-β-glucosaminidase, α-mannosidase, α-fucosidase and trypsin was detected. Vivid changes in biochemical profiles were found after treatment with tea tree oil and they were related to loss of ability to assimilate d-xylose, d-sorbitol and d-trehalose. The main differences in morphology of isolates compared to the control strain concerned formation of pseudohyphae structures. Both examined essential oils caused changes in cell and colony morphology, as well as in the metabolism of Candida albicans. However, the extent of differences depends on the type and concentration of an essential oil. The most important finding is the broad spectrum of changes in yeast enzymatic profiles induced by thyme and tea tree oils. It can be supposed that these changes, together with loss of ability to assimilate saccharides could significantly impact Candida albicans pathogenicity.
Źródło:
Acta Biochimica Polonica; 2014, 61, 2; 305-310
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antibiotics sensitivity of Candida clinical and food-borne isolates
Autorzy:
Maroszyńska, Marta
Kunicka-Styczyńska, Alina
Rajkowska, Katarzyna
Maroszyńska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/1039473.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Candida
fluconazole
voriconazole
caspofungin
nystatin
clinical and food strains
Opis:
Candida is a yeast species recognized as the most frequent etiological agent of systemic and invasive thrush in humans. Invasions can affect all tissues, organs and systems of human in various stages of development. In the last 10 years Candida infections have increased 15 times. The purpose of our study was to determine the sensitivity of four antibiotics belonging to three different groups of antifungal agents against clinical and food-borne Candida strains. Our studies showed that of all tested strains, 7% was resistant to nystatin, 32% to fluconazole, 23% to voriconazole, and no strains grew in the presence of caspofungin. Despite the differences in biochemical profiles of clinical and food-borne isolates of Candida, a group of strains showing resistance to antibiotics include both types of isolates. At the same time circulating of antibiotic-resistant strains outside the hospital environment and the yeast infection via food is possible.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 719-724
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quaternary ammonium biocides as antimicrobial agents protecting historical wood and brick
Autorzy:
Rajkowska, Katarzyna
Koziróg, Anna
Otlewska, Anna
Piotrowska, Małgorzata
Nowicka-Krawczyk, Paulina
Brycki, Bogumił
Kunicka-Styczyńska, Alina
Gutarowska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1038857.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
quaternary ammonium salts
biocides
antibacterial and antifungal activity
protection against development of microorganisms
building historical material
Opis:
Quaternary ammonium compounds (QACs) are widely used in disinfection of water, surfaces and instruments as well as in textile, leather and food industries because of their relatively low toxicity, broad antimicrobial spectrum, non-volatility and chemical stability. Due to these advantages, QACs are also used in restoration and can be applied on historical material. The aim of this study was to determine the usefulness of biocides based on quaternary ammonium salts and containing various excipients in the protection of historical materials against microbial growth. The study determined the antimicrobial activity of three biocides against bacteria: Pseudomonas fluorescens, Staphylococcus equorum, Bacillus cereus, Bacillus muralis, Sporosarcina aquimarina and Rhodococcus fascians, and moulds: Chaetomium globosum, Penicillium citreonigrum, Cladosporium cladosporioides I, Acremonium strictum, Aspergillus fumigatus and Cladosporium cladosporioides II, all isolated from historical wood and brick. Staphylococcus equorum, Bacillus cereus, Sporosarcina aquimarina and Rhodococcus fascians bacteria, and Cladosporium cladosporioides I and Acremonium strictum moulds showed high sensitivity to quaternary ammonium biocides. Historical wood can be effectively disinfected by three applications of biocide A (30% v/v) containing dodecyl dimethyl ammonium chloride (DDAC), citric acid, propiconazole and propanol. Disinfection of historical brick can be carried out by three applications of 6% v/v solutions of biocide B (based on DDAC and ethylenediaminetetraacetic acid - EDTA) or biocide C (containing a non-ionic surfactant, DDAC and EDTA). Effective protection of historical building materials against microbial growth for a period of seven days can be achieved by the application of biocide A (30% v/v) on the wood surface and biocide B (6% v/v) on the brick surface.
Źródło:
Acta Biochimica Polonica; 2016, 63, 1; 153-159
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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