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Wyszukujesz frazę "Candida antarctica" wg kryterium: Temat


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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