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    Wyświetlanie 1-4 z 4
    Tytuł:
    Isolation, characterisation and biological activity of melanin from Exidia nigricans
    Autorzy:
    Łopusiewicz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1178254.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Exidia nigricans
    antimicrobial
    antioxidant
    light barrier
    melanin
    pigment
    Opis:
    The aim of present study was isolation and characteriation of raw and purified melanin from Exidia nigricans. Native melanin was isolated from the fresh E. nigricans fruiting bodies by alkaline extraction. Obtained pigment was purifed by acid hydrolysis and washed by organic solvents. Chemical tests, FT-IR and Raman spectroscopy analysis were conducted to determine the melanin nature of the isolated pigment. UV-Vis, transmittance and colour properties were evaluated. Antioxidant activity was determined using ABTS and antibacterial activity by a well diffusion method. The results of the study demonstrated that melanins isolated from E. nigricans had antioxidant, light barrier and antibacterial properties. A purified form of melanin offered better light properties and higher antioxidant activity than the raw form. Both melanins inhibited the growth of E. facealis and P. aeruginosa. This study revealed that E. nigricans may be considered as a promising source of natural melanin. Isolated pigments presented all the physical and chemical properties common to natural and synthetic melanins. Raw and purified melanins showed differences in chemical composition, antioxidant activity and light barrier properties. Melanin may play pivotal role in physiology of E. nigricans protecting it against UV radiation and dessication.
    Źródło:
    World Scientific News; 2018, 91; 111-129
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scleroderma citrinum melanin: isolation, purification, spectroscopic studies with characterization of antioxidant, antibacterial and light barrier properties
    Autorzy:
    Łopusiewicz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1156260.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Scleroderma citrinum
    antibacterial
    antioxidant
    earthball
    light barrier
    melanin
    Opis:
    The aim of this study was to isolate and evaluate biological properties of raw and purified melanins isolated from Scleroderma citrinum. Native melanin was isolated from the gleba of fresh S. citrinum fruiting bodies by alkaline extraction. Obtained pigment was purifed by acid hydrolysis and washed by organic solvents. Chemical tests, FT-IR and Raman spectroscopy analysis were conducted to determine the melanin nature of the isolated pigments. UV-Vis, transmittance, total polyphenolic content and colour properties were evaluated. Antioxidant activity was determined using ABTS and antibacterial activity by a well diffusion method. The results of the study demonstrated that melanins isolated from S. citrinum had antioxidant, light barrier and antibacterial properties. A purified form of melanin offered better light properties and higher antioxidant activity than the raw form. Both melanins inhibited the growth of E. facealis and P. aeruginosa. This study revealed that S. citrinum may be considered as a promising source of natural melanin. Isolated pigments presented all the physical and chemical properties common to natural and synthetic melanins. Raw and purified melanins showed differences in chemical composition, antioxidant activity and light barrier properties. Results suggest that, melanins from S. citrinum possess remarkable therapeutic action and could be applied in the food, cosmetics and pharmaceutical industries.
    Źródło:
    World Scientific News; 2018, 94, 2; 115-130
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The isolation, purification and analysis of the melanin pigment extracted from Armillaria mellea rhizomorphs
    Autorzy:
    Łopusiewicz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1177769.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Armillaria mellea
    antibacterial
    antioxidant
    light barrier
    melanin
    rhizomorphs
    Opis:
    The aim of present study was isolation and characteriation of raw and purified melanin from Armillaria mellea rhizomorphs. Native melanin was isolated from the rhizomorphs of A. mellea by alkaline extraction. Obtained pigment was purifed by acid hydrolysis and washed by organic solvents. Chemical tests, FT-IR and Raman spectroscopy analysis were conducted to determine the melanin nature of the isolated pigment. UV-Vis, transmittance and colour properties were evaluated. Antioxidant activity was determined using ABTS and antibacterial activity by a well diffusion method. The results of the study demonstrated that melanins isolated from A. mellea rhizomorphs had antioxidant, light barrier and antibacterial properties. A purified form of melanin offered better light properties and higher antioxidant activity than the raw form. Both melanins showed antimicrobial activity, raw melanin form had broader activity compared to the pure form. This study revealed that A. mellea rhizomorphs may be considered as a promising source of natural melanin. Isolated pigments presented all the physical and chemical properties common to natural and synthetic melanins. Raw and purified melanins showed differences in chemical composition, antioxidant activity and light barrier properties. Results of this study suggest that, melanins from A. mellea could be applied in the food, cosmetics and pharmaceutical industries.
    Źródło:
    World Scientific News; 2018, 100; 135-153
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Active Packaging Films Made from Gelatin Modified with Fungal Melanin
    Autorzy:
    Łopusiewicz, Łukasz
    Jędra, Filip
    Bartkowiak, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1177694.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Agaricus bisporus
    antioxidant
    barrier properties
    gelatin
    mechanical properties
    melanin
    packaging
    Opis:
    Fungal melanin was used to prepare gelatin-based composite films. The films of various melanin concentrations (0.1%, 0.5% and 1% w/w) were prepared using a solution casting method. The mechanical, antioxidant, antimicrobial, water vapor, oxygen and UV-Vis barrier properties, as well as any available surface polyphenolics were studied. FT-IR and Raman spectroscopy studies were carried out to analyse the chemical composition of the resulting films. The hydrophobocity, solubility, colour response, optical properties and opacity were also determined. The results of this study showed that the modification of gelatin with fungal melanin had no influence on mechanical and water vapor barrier properties, oxygen barrier properties were improved. The UV-Vis barrier properties of modified films were significantly improved. Modified gelatin films showed good antioxidant activity but were inactive against microorganisms. The modification with melanin caused changes in colour values, decreasing lightness and increasing the redness and yellowness of the films. Based on the results of this study, fungal melanin has good potential to be utilised as a value-added modifier that can improve the properties of gelatin films.
    Źródło:
    World Scientific News; 2018, 101; 1-30
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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