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    Wyświetlanie 1-7 z 7
    Tytuł:
    Biodiesel from coconut acid oil using Candida rugosa and Candida antarctica lipases
    Autorzy:
    Nandi, Sumit
    Bhattacharyya, Rupa
    Powiązania:
    https://bibliotekanauki.pl/articles/1031280.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Bioesterification
    Biohydrolysis
    Candida Antarctica
    Candida rugosa
    Coconut acid oil
    Opis:
    Coconut acid oil (CAO) is a byproduct from the processing of coconut oil. CAO has a tremendous potential in the preparation of alternative fuel as biodiesel. In the present research investigation, CAO has been utilized for the preparation of biodiesel using Lipase AY Amano 30 (Candida rugosa) and Novozyme 40013 (Candida antarctica) in the presence of methanol using hexane as solvent. Initially, Lipase AY Amano 30 has been used for the biohydrolysis of neutral glycerides present in CAO, under the influence of water at 400C. Henceforth, the hydrolysed CAO was bioesterified with methanol in the presence of non-specific immobilized enzyme NS 40013 for the production of alternative fuel. The characteristics of CAO biodiesel (CAOB) was compared with diesel fuel and good outcome has been revealed. So cheap raw materials like CAO has been selectively utilized for the production of alternative fuel through a novel technology which may be useful for the partial replacement of present non-renewable fuels.
    Źródło:
    World News of Natural Sciences; 2021, 34; 72-81
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neem (Azadirachta indica A. Juss.) oil: A source of alternative fuel through enzyme technology
    Autorzy:
    Nandi, Sumit
    Bhattacharyya, Rupa
    Mitra, Swarnendu
    Powiązania:
    https://bibliotekanauki.pl/articles/1193346.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Azadirachta indica
    Candida antarctica
    Crude Neem oil
    diacylglycerol
    monoacylglycerol
    triacylglycerol
    Opis:
    Production of alternative energy sources from eco-friendly raw materials is supposed to be the most challenging job among researchers and academicians in the present world. Biodiesel has been considered as most useful green energy sources which is produced from Crude Neem (Azadirachta indica) oil (CNO) in the present study. The main advantages of CNO is that it is non-edible and is obtained abundantly in nature from neem seed. Initially, after bleaching of CNO, it is transesterified with methanol in the presence of non-specific enzyme catalyst Novozyme 40013 (Candida antarctica) maintaining certain reaction conditions. The parameters of the transesterification reaction have been identified as 8:1 molar ratio of methanol to CNO, 60 °C temperature in the presence of 6% enzyme Novozyme 40013 and 600 rpm of mixing intensity for 9 hrs of reaction duration. The product obtained, after completion of reaction, has been estimated of 91.24% biodiesel along with minor amounts of triacylglycerol (TAG), diacylglycerol (DAG) and monoacylglycerol (MAG). Finally, the physico-chemical properties of CNO biodiesel have been analysed and it showed good conformity with diesel fuel and biodiesel standard.
    Źródło:
    World Scientific News; 2021, 154; 76-88
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estryfikacja skrobi ziemniaczanej kwasem oleinowym w obecności lipazy z Candida antarctica w polu mikrofalowym oraz w warunkach ogrzewania konwencjonalnego
    Esterification of potato starch with oleic acid in the presence of lipase from Candida antarctica in a microwave field and under conventional heating
    Autorzy:
    Ptak, S.
    Żarski, A.
    Antczak, T.
    Kapuśniak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/947468.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    skrobia termoplastyczna
    hydrofobizacja
    estryfikacja
    kwas oleinowy
    pole mikrofalowe
    lipaza z Candida antarctica
    thermoplastic starch
    hydrophobization
    esterification
    oleic acid
    microwave field
    lipase from Candida antarctica
    Opis:
    Estryfikowano natywną skrobię ziemniaczaną długołańcuchowym nienasyconym kwasem oleinowym w obecności lipazy pochodzącej z Candida antarctica, immobilizowanej na nośniku polimerowym. Reakcję prowadzono w polu mikrofalowym oraz w warunkach ogrzewania konwencjonalnego. Przebieg estryfikacji potwierdzono za pomocą spektroskopii w podczerwieni FT-IR i magnetycznego rezonansu jądrowego 1H NMR, proszkowej dyfrakcji rentgenowskiej (XRD) oraz skaningowej mikroskopii elektronowej (SEM). Stwierdzono, że otrzymany produkt termoplastyczny wykazuje większą hydrofobowość niż natywna skrobia ziemniaczana.
    An attempt has been made to prepare hydrophobic, thermoplastic material through esterification of potato starch with long-chain unsaturated fatty acid. The esterification was conducted in the presence of fungal lipase from Candida antarctica immobilized on apolymer carrier. Reaction was conducted in amicrowave field and, for comparison, under conventional heating. The completion of the esterification reaction was confirmed by spectroscopic FT-IR and 1H NMR methods, X-ray powder diffraction and scanning electron microscopy (SEM). It was found that the obtained product exhibited higher hydrophobicity than native potato starch.
    Źródło:
    Polimery; 2016, 61, 6; 442-448
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal and molecular structure of hexagonal form of lipase B from Candida antarctica
    Autorzy:
    Strzelczyk, Paweł
    Bujacz, Grzegorz
    Kiełbasiński, Piotr
    Błaszczyk, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1038848.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    CAL-B
    lipase B
    Candida antarctica
    apo form
    crystallographic polymorphism
    macromolecular crystallography
    Opis:
    During crystallization screenings of commercially available hydrolytic enzymes, the new, hexagonal crystal form of CAL-B, has been discovered and hereby reported. The NAG molecules, which were closing the glycosylation site in the orthorhombic form, in hexagonal structure make the glycosylation site open. It is unknown whether the opening and closing of the glycosylation site by the 'lid' NAG molecules, could be related to the opening and closing of the active center of the enzyme upon substrate binding and product release.
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 1; 103-109
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dwie dekady chemo-enzymatycznej reakcji Baeyera-Villigera
    Two decades of chemo-enzymatic Baeyer-Villiger reaction
    Autorzy:
    Drożdż, A.
    Bielas, R.
    Chrobok, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171768.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    reakcja Baeyera-Villigera
    chemo-enzymatyczna reakcja Baeyera-Villigera
    laktony
    utlenianie cyklicznych ketonów
    lipaza B Candida antarctica
    chemo-enzymatic Baeyer–Villiger reaction
    lactones
    cyclic ketones oxidation
    lipase B Candida antarctica
    Opis:
    The Baeyer–Villiger oxidation of ketones to lactones or esters is a reaction of significant interest in organic chemistry owing to very wide range of possible applications, e.g. in the synthesis of antibiotics, steroids, pheromones and monomers for polymerisation. The organic percarboxylic acids typically used as oxidants in these reactions are fairly expensive, often poorly stable and hazardous, and this consequently limits their commercial application. Therefore, the chemo-enzymatic approach appears to be a very attractive alternative. The paper presents literature reports concerning the application the use of lipase B from Candida antarctica in the chemo-enzymatic Baeyer-Villiger oxidation. It involves oxidation of long- or medium-chain carboxylic acids with H2O2 or urea hydrogen peroxide to generate in situ peracid which is later used to oxidise ketones to lactones.
    Źródło:
    Wiadomości Chemiczne; 2014, 68, 11-12; 1031-1048
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przemysłowe zastosowania lipaz w syntezie związków o wysokiej wartości dodanej – 85 lat katalizy enzymatycznej lipazami. Część 1
    Industrial applications of lipases in the synthesis of high added-value chemicals – 85 years of lipase-based enzymatic catalysis. Part 1
    Autorzy:
    Borowiecki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/171564.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    lipazy
    lipaza B Candida antarctica
    CAL-B
    lipaza Burkholderia cepacia
    BCL
    zastosowania przemysłowe
    biokataliza
    związki enancjomerycznie czyste
    Candida antarctica lipase B
    Burkholderia cepacia lipase
    industrial applications
    biocatalysis
    enantiomerically pure compounds
    Opis:
    Lipases (EC 3.1.1.3; triacylglycerol acylhydrolases) are the most commonly used enzymes in biotransformations of organic compounds. In living organisms lipases catalyze hydrolysis of higher fatty acid esters of glycerol, thus fulfill an essential function in metabolism of lipids (e.g. fats and oils) and lipoproteins. This year marks 125 years since J.R. Green has identified and described the first lipase isolated from germinated castor-oil beans (Ricinus communis L.) in the form of an extract showing hydrolytic properties. Plants, as well as bacteria are able to produce lipases what was reported in 1901 by Dutch scientist ‒ Christiaan Eijkman. Lipases are also produced by fungi, yeasts, and various organs of higher organisms. A strong foundation, which had a huge impact on the development of global lipase-mediated biotransformations was the discovery made in 1935 and described in Biochemistry Journal and Biochemische Zeitschrift by Polish biochemist- -enzymologist Ernest Alexander Sym (1893-1950) that these enzymes retain almost full catalytic activity even in nearly anhydrous organic solvents. This was exactly fifty years before Russian chemist Alexander Klibanov in 1985 described a lipase- -catalyzed reaction carried out in organic solvents. Since that moment, lipases have became extremely popular in both academic and industrial usage, nowadays being the most important among all biocatalysts used in biochemical processes carried out on an industrial scale. The purpose of this article is to provide a brief characterization of the two most widely used in industrial biotransformations lipases ‒ lipase B from Candida antarctica (CAL-B) and lipase from Burkholderia cepacia (BCL) ‒ and familiarize the readers with the issues of biotechnological processes catalyzed by them. The specifics of a range of industrial applications based on lipase catalysis, including the chemical, pharmaceutical, cosmetic and food industries are also discussed. Keywords:
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 5-6; 391-430
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical highly enantioselective synthesis of (R)- and (S)-(E)-4-hydroxynon-2-enal
    Autorzy:
    Komisarski, Marek
    Kaczmarska, Zuzanna
    Kuśmierek, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1040657.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    asymmetric synthesis
    4-HNE enantiomers
    (E)-4-hydroxynon-2-enal (4-HNE) synthesis
    lipid peroxidation
    Candida antarctica lipase
    Opis:
    Oxidative stress enhances lipid peroxidation (LPO) implicated in cancer promotion and progression. (E)-4-Hydroxynon-2-enal 1 (trans-4-hydroxy-2-nonenal, HNE) is one of the most abundant products of LPO. Reactions of HNE with DNA and proteins are responsible for its mutagenic and toxic effects. On the other hand, HNE is regarded as a key molecule in stress mediated cell cycle signaling. LPO generates racemic HNE (rac-1); however, it is expected that the individual enantiomers will behave differently in their interactions with cell components. The study of HNE stereochemistry in its chemical and biochemical interactions is hindered by the lack of expedient methods for preparation of pure enantiomers. This study presents one step synthesis of HNE in a cross-metathesis reaction between the commercially available oct-1-en-3-ol and acrolein in the presence of 2nd generation Grubbs catalyst. The use in the metathesis reaction of enantiomers of oct-1-en-3-ol obtained via Candida antarctica lipase resolution of the racemate allowed us to prepare of 4-(R)- and 4-(S)-enantiomers of HNE (R-1 and S-1, respectively) with excellent optical purity (97.5 and 98.4% ee, respectively) and good chemical yields (70%).
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 1; 189-193
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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