Levulinic Acid
Mostrando 1-12 de 51 artigos, teses e dissertações.
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1. Open Science and the Role of Cardiology Journals in the COVID-19 Pandemic
In the current search for renewable energy sources, residual biomass has gained ground in the concept of biorefinery. Furanic compounds such as 5-hydroxymethylfurfural (HMF), furfural (FF) and derivatives such as levulinic acid (LA), obtained from biomass, have emerged as important industrial chemical platforms. In this sense, this work aimed to use pequi ba
Int. J. Cardiovasc. Sci.. Publicado em: 2020-07
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2. Production of Furanic Compounds and Organic Acids from Brazilian Pequi (Caryocar brasiliensis Camb.) Residues Using Green Chemistry
In the current search for renewable energy sources, residual biomass has gained ground in the concept of biorefinery. Furanic compounds such as 5-hydroxymethylfurfural (HMF), furfural (FF) and derivatives such as levulinic acid (LA), obtained from biomass, have emerged as important industrial chemical platforms. In this sense, this work aimed to use pequi ba
J. Braz. Chem. Soc.. Publicado em: 2020-07
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3. An Acetal Acylation Methodology for Producing Diversity of Trihalomethyl-1,3-dielectrophiles and 1,2-Azole Derivatives
A series of functionalized 1,1,1-trihalo-4-methoxy-3-alken-2-ones [CX3C(O)CR1=CROMe, where X = F or Cl; R = n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-tridecyl, (CH2)2CH=C(Me)2, (CH2)2Ph, (CH2)2-(4-HOC6H4), (CH2)2-(4-MeOC6H4), (CH2)2CO2Me, (CH2)3CO2Me, CH(SMe)CH3, CH2(2-MeOC6H4), and R1 = H, and R = H and R1 = n-decyl] were synthesized from respective
J. Braz. Chem. Soc.. Publicado em: 2020-02
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4. Fast Screening of Solvents for Simultaneous Extraction of Furfural, 5-Hydroxymethylfurfural and Levulinic Acid from Aqueous Solution Using SMD Solvation Free Energies
Acid catalyzed decomposition of C5 and C6 sugars has been considered an important source of biomass derived chemicals. An essential step in this process is the extraction of furfural, hydroxymethylfurfural and levulinic acid from aqueous phase. In this work, a computational screening of 178 organic solvents for simultaneous extraction of these chemicals from
J. Braz. Chem. Soc.. Publicado em: 2018-02
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5. Inhibitor tolerance of a recombinant flocculating industrial Saccharomyces cerevisiae strain during glucose and xylose co-fermentation
ABSTRACT Lignocellulose-derived inhibitors have negative effects on the ethanol fermentation capacity of Saccharomyces cerevisiae. In this study, the effects of eight typical inhibitors, including weak acids, furans, and phenols, on glucose and xylose co-fermentation of the recombinant xylose-fermenting flocculating industrial S. cerevisiae strain NAPX37 wer
Braz. J. Microbiol.. Publicado em: 2017-12
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6. Strategies for the Efficient Synthesis of Biheterocyclic 5-[2-(Trifluoromethylheteroaryl)-ethyl]-1,3,4-oxadiazoles from Levulinic Acid
The synthesis of 5-[2-(trifluoromethylheteroaryl)-ethyl]-1,3,4-oxadiazoles derived from levulinic acid is reported. Cyclocondensations [4 + 1] between four different 5-[2-(trifluoromethylheteroaryl)propionylhydrazides derived from methyl 7,7,7-trifluoro-4-methoxy-6-oxo-4-heptenoate obtained from levulinic acid, and electrophilic orthoesters RC(OR1)3 (where R
J. Braz. Chem. Soc.. Publicado em: 2017-11
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7. A straightforward and efficient synthesis of 3-(pyrimidinyl)propanoates from levulinic acid
Neste trabalho, a ciclocondensação dos precursores 7,7,7-trifluoro-4-metoxi-6-oxo-4 heptenoato de metila e 7,7,7-trichloro-4-metoxi-6-oxo-4-heptenoato de metila, a partir do ácido levulínico com amidinas [NH2CONH2, NH2CR(NH) (R = H, Me, Ph, NH2, SMe e 1H-pirazol-1-il), 5-amino-3-metil-1H-pirazol e 2-aminotiazol] para obtenção de 3-(6-trifluormetilpirim
J. Braz. Chem. Soc.. Publicado em: 2013-04
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8. PRODUÇÃO DE ÁCIDO LEVULÍNICO POR MEIO DE HIDRÓLISE ÁCIDA DA CASCA DE ARROZ / ACIDS PRODUCTION BY MEANS OF ACID HYDROLYSIS OF RICE HUSK
The beginning of the 21st century has been characterized by a great interest about the use of renewable raw materials for the production of industrial feedstocks and technological products. This trend is followed by the concern about the huge amount of waste generated by the always increasing agricultural production. In this sense, the reuse of the residual
Publicado em: 2010
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9. Production of biodegradable plastics using sugarcane bagasse hemicellulosic hydrolysate. / Produção de plásticos biodegradáveis utilizando hidrolisado hemicelulósico de bagaço de cana-de-açúcar.
The aim of this thesis is to produce poly3-hydroxybutyrate (P3HB) and poli-3-hidroxibutirate-co-3-hydroxyvalerate (PHB-co-3HV), biodegradable polymers, using hemicellulosic hydrolysate, rich in xylose, from sugarcane bagasse. Metabolic flux analysis in silico of xylose metabolism indicated that, though metabolism redirection is possible to increase P3HB yiel
Publicado em: 2010
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10. SÍNTESE DE 1H-PIRAZÓIS USANDO IRRADIAÇÃO DE ULTRA-SOM E DE 2-PIRROLONAS DERIVADAS DO ÁCIDO LEVULÍNICO / SYNTHESIS OF 1H-PYRAZOLES BY ULTRASOUND IRRADIATION AND 2-PYRROLONES DERIVATED FROM LEVULINIC ACID
This work describes the synthesis of 4,5-dihydropirazoles through a sonochemical methodology, from the reaction of cyclocondensation of 1,3-diaryl-2-propen-1-ones with aminoguanidine hydrochloride and thiosemicarbazide. These reactions were carried out in ethanol in periods of reduced time concerning to the methods described in the literature. Then, it prese
Publicado em: 2008
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11. Modulation of cytochrome biosynthesis in yeast by antimetabolite action of levulinic acid.
Levulinic acid, a competitive inhibitor of delta-aminolevulinic acid dehydratase, was used to inhibit cytochrome biosynthesis in growing yeast cells. In Saccharomyces cerevisiae the antimetabolite acts by inhibiting delta-aminolevulinic acid dehydratase in vivo, causing an accumulation of intracellular delta-aminolevulinic acid and simultaneous decreases in
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12. Events Surrounding the Early Development of Euglena Chloroplasts: V. Control of Paramylum Degradation 1
The degradation of the storage carbohydrate, paramylum, is induced by light in wild-type Euglena gracilis Klebs var. bacillaris Pringsheim and in a mutant, W3BUL, which lacks detectable plastid DNA. Treatment of wild type with cycloheximide in the dark produces 60% as much paramylum breakdown as light, whereas treatment with levulinic acid in the dark yields