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Wyszukujesz frazę "biotransformations" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Dehydrogenazy alkoholowe pochodzenia mikrobiologicznego : właściwości i ich zastosowanie
Microbial alcohol dehydrogenases : properties and their application
Autorzy:
Szczepańska, E.
Boratyński, F.
Powiązania:
https://bibliotekanauki.pl/articles/172286.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
dehydrogenaza alkoholowa
biotransformacja
bakterie
alcohol dehydrogenase
biotransformations
bacteria
Opis:
Biotransformations involve mainly microorganisms or individual enzymes applied to catalyze chemical reactions [1]. This field of science is particularly important, because it allows to obtain optically active compounds, which are valuable raw materials for pharmaceutical (Fig. 3, Fig. 6, Fig. 20, Fig. 21), wood and paper (Fig. 18), food (Fig. 4), textile (Fig. 12), cosmetic (Fig. 14) industries and environmental protection (Fig. 19). Oxidoreductases, in particular alcohol dehydrogenases (E.C.1.1.1.1, ADH) are valuable biocatalysts enabling to obtain enantiomerically pure products. These enzymes, commonly found in nature, catalyze both oxidation and reduction reactions [3]. Described dehydrogenases descend from mesophilic, psychrophilic and thermophilic microorganisms. The increasing application of thermophiles is due to their exceptional resistance against heat and organic solvents. The article describes and explains how microbial ADH’s interact with NAD+/NADH or NADP+/NADPH and present those enzymes which catalyze reactions with both forms of cofactors. The alcohol dehydrogenases from yeast are particularly commonly used [9–14]. Bacterial enzymes, among them ADH isolated from Thermoanaerobacter brockii [47–51], are widely distributed too. In addition, the literature describes a number of (R)-specific ADH’s from Lactobacillus kefir [40–42], L. brevis [45, 46], Leisofonia sp. [20] Pseudomonas fluorescens [23] and (S)- -specific ADH’s from Rhodococcus erythropolis [15, 16], Thermus sp. [30], Sulfolobus solfataricus [23, 28] and many others.
Źródło:
Wiadomości Chemiczne; 2014, 68, 11-12; 1049-1071
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dihydrochalkony jako naturalna alternatywa dla obecnie stosowanych słodzików
Dihydrochalcones as a natural alternative to currently used sweeteners
Autorzy:
Dymarska, Monika
Filip, Dagmara
Perz, Martyna
Janeczko, Tomasz
Kostrzewa-Susłow, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/27310042.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
cukier
słodziki
dihydrochalkony
biotransformacje
sugar
sweeteners
dihydrochalcones
biotransformations
Opis:
The craving for sweets is a universal desire that connects people of all ages and cultures. Traditionally used sweeteners based on sugars, such as sucrose or glucose-fructose syrup, are known for their multidirectional negative impact on human health. With the development of research into artificial sweeteners and natural sucrose alternatives, more and more consumers are turning to healthier options to satisfy their sweet tooth. Among the potential new sweeteners of natural origin, dihydrochalcones deserve special attention. These compounds belong to polyphenols and are present in plants. In the daily diet of people, their source may be citrus fruits, strawberries and apples. Dihydrochalcones, like other polyphenols, have a high and diverse health-promoting effect, e.g. antioxidant, antimicrobial or anticancer. Unfortunately, their extraction from plant material is challenging and economically unprofitable. The article presents a brief description of traditionally used sweeteners based on sugar, as well as alternative sweeteners. Methods for the chemical synthesis of dihydrochalcones are presented here, and the biotransformation processes involved in producing these sweet-tasting compounds are discussed.
Źródło:
Wiadomości Chemiczne; 2023, 77, 5-6; 479--507
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biotransformacje z udziałem genetycznie modyfikowanych drożdży Saccharomyces cerevisiae
Biotransformations with genetically modified bakers yeast Saccharomyces cerevisiae
Autorzy:
Białecka-Florjańczyk, E.
Zamojska, W.
Kapturowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/171849.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
Saccharomyces cerevisiae
biotransformacja
biokatalizatoy komórkowy
inżynieria genetyczna
biotransformations
whole-cell biocatalysts
genetic engineering
Opis:
Baker’s yeast Saccharomyces cerevisiae is quite commonly applied as a wholecell biocatalysts in biotransformations – reactions based on enzymatic transformations of chemical compounds. Yeast cells are easy in cultivation and use. They are usually used to catalyze such reactions as bioreduction or hydrolysis. The full sequencing of its genome accompanied with achievements of genetic engineering allowed to design new yeast strains characterized by high conversion yield and reaction selectivity. Genetically modified cells of Saccharomyces cerevisiae catalyze biotransformations, which lead to chiral building blocks important in pharmaceutical industry (especially those obtained by reduction of á- and â -oxoesters). „Designer yeast” is a new catalyst for Baeyer–Villiger oxidation. Recombinant yeast lipases have been discussed as useful means in biodiesel production because the microbiological method of producing of this kind of fuel has many advantages. There is a growing interest in application of modified yeast in biotransformation reactions. Modern directions to improve catalytic abilities of baker’s yeast include: the use of surface display technology of enzymes, optimization or increase in availability of cofactor required for bioreduction reactions or gene knock-out, which eliminates the activity of enzymes with conflicting and unwanted stereoselectivities. Commonly used technique is also overexpression of the desired protein or expression of heterologous enzymes in yeast cells.
Źródło:
Wiadomości Chemiczne; 2011, 65, 1-2; 93-110
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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