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    Wyświetlanie 1-3 z 3
    Tytuł:
    Characteristics of physicochemical and rheological properties of chitosan hydrogels based on selected hydroxy acids
    Autorzy:
    Zavyalova, Olga
    Gajewska, Sandra
    Dąbrowska-Wisłocka, Dominika
    Sionkowska, Alina
    Powiązania:
    https://bibliotekanauki.pl/articles/2058389.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    chitosan
    lactobionic acid
    mandelic acid
    rheology
    FTIR spectra
    chitozan
    reologia
    hydrożele
    Opis:
    Chitosan is a natural cationic polymer that dissolves in an acidic environment and forms gels. Its properties depend on the degree of deacetylation and molecular weight. It is a bioactive compound with antibacterial and film-forming properties that allow to increase the regenerative capacity of the skin. Moreover, it is biodegradable, biocompatible, non-toxic, and stable. In this research, chitosan was combined with mandelic and lactobionic acids which are characterized by biological activity and low toxicity. This combination not only has a positive effect on the chitosan solubility, but it also allows to obtain new biomaterials whose positive features of the base ingredients are enhanced by their synergistic effect. The obtained hydrogels were assessed regarding the interaction of chitosan and hydroxy acid molecules, and the stability of the resulting structures was examined. The research was performed by using rheological methods and IR spectroscopy. Chitosan hydrogels made with mandelic acid are characterized by higher viscosity values, as compared to hydrogels containing lactobionic acid. The samples of the obtained hydrogels stored for 7 days showed no signs of degradation and their viscosity values were constantly increasing, which proves the ongoing process of creating new bonds between hydroxy acid molecules and chitosan chains. After this time, the hydrogels with mandelic acid revealed higher viscosity values in comparison to hydrogels made with lactobionic acid. Based on the obtained IR spectra, the shifts of the characteristic chitosan bands as a result of interaction with the tested hydroxy acids were analyzed.
    Źródło:
    Engineering of Biomaterials; 2021, 24, 161; 2--7
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetyczny rozdział enancjomerów kwasu migdałowego w reaktorze kolumnowym
    Kinetic separation of mandelic acid enanciomers in a column reactor
    Autorzy:
    Dąbkowska, K.
    Szewczyk, K. W.
    Piasecka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2070489.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    lipaza
    kwas migdałowy
    kinetyka enzymatyczna
    lipase
    mandelic acid
    enzyme kinetic
    Opis:
    Kinetyczny rozdział enancjomerów kwasu migdałowego prowadzono na drodze transestryfikacji octanem winylu katalizowanej przez lipa-zę z Burkholderia cepacia. Proces realizowano w sposób ciągły w reaktorze kolumnowym wypełnionym enzymem. Przebieg reakcji opisano modelem Bi Bi Ping Pong z inhibicją substratem i produktem.
    Racemic mandelic acid was separated in a column reactor using tran-sesterification with vinyl acetate catalyzed by Burkholderia cepacia li-pase. The Bi Bi Ping Pong mechanism with inhibition by both substrate and product was used in reaction rate modeling.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2009, 3; 40-41
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of urinary biomarkers concentrations in exposed and non-exposed petrol station workers in the Eastern Economic Corridor (EEC), Thailand
    Autorzy:
    Thetkathuek, A.
    Polyong, C.P.
    Jaidee, W.
    Sirivarasai, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083079.pdf
    Data publikacji:
    2022
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    exposure to gasoline
    trans trans-muconic acid
    toluene
    mandelic methyl hippuric acid
    urinary biomarker
    Opis:
    Background. The Thai government has been developing its Eastern Economic Corridor (EEC), which spans three provinces, with the aim of improving connections with other Asian nations. Since this strategic development, the number of trucks, private car, and passenger car registrations have continued to grow, with a corresponding increase in related to benzene, toluene, ethylbenzene, and xylene (BTEX). Objectives. This study aims to compare the levels of trans, trans-muconic acid (t, t MA); toluene (TU); mandelic acid (MA); and methyl hippuric acid (MHA) in the urine of gas station employees, considering demographic and occupational factors. Material and methods. These employees worked either near or away from the fuel dispenser, and there 100 people in each group. Data were collected using interviews and testing environmental air and urine samples for benzene, toluene, ethyl benzene, and xylene (BTEX). Results. The results showed that BTEX concentrations were just detectable in all 200 cases (100%). The mean (±SD) urine level of t, t MA was 449.28 (±213.32) μg/g creatinine, while the median (min-max) was 428.23 (95.58-1202.56) μg/g creatinine. The mean TU was 0.011 (0.001) mg/L, while the median (min-max) was 0.011 (0.010-0.013) mg/L. MA levels were higher inside the pollution control zone than they were outside the zone (p=.009). Employees who practiced poor personal hygiene had relatively high urinary toluene and MHA levels (p=.009) and those who did not wear personal protective equipment (PPE) had relatively high MA levels (p=.040). Conclusion. The results of this study revealed statistically significant biomarkers influencing the levels of t, t MA; TU; MA; and MHA in urine. The recommendations of this study are that employers should provide their employees with suitable PPE, check regularly to ensure that it is worn, and strongly encourage employees to take care of their sanitation. Employees should take appropriate breaks and days off to minimize their exposure to BTEX.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2022, 73, 1; 109-119
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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