538205

Applied Filters:

Keyword:'538205'

Showing 1-30 of 35 results for "538205" within Papers

Volatile profile of cashews (Anacardium occidentale L.) from different geographical origins during roasting.

Amal Agila et al.

Journal of food science, 76(5), C768-C774 (2012-03-16)

Volatile compounds were quantified in the headspace of Indian, Vietnamese, and Brazilian cashews, both raw and during roasting by selected ion flow tube-mass spectrometry. The optimum roasting times based on color measurements were also determined. Raw cashews were oil roasted

Isobutyraldehyde production from Escherichia coli by removing aldehyde reductase activity.

Gabriel M Rodriguez et al.

Microbial cell factories, 11, 90-90 (2012-06-27)

Increasing global demand and reliance on petroleum-derived chemicals will necessitate alternative sources for chemical feedstocks. Currently, 99% of chemical feedstocks are derived from petroleum and natural gas. Renewable methods for producing important chemical feedstocks largely remain unaddressed. Synthetic biology enables

Identification of distinctive volatile compounds in fish sauce.

Katsuya Fukami et al.

Journal of agricultural and food chemistry, 50(19), 5412-5416 (2002-09-05)

To make clear the distinctive odorants of fish sauce, addition tests were carried out with respect to deodorized fish sauce samples. Volatiles from the headspace gas of nontreated fish sauce and deodorized fish sauce were characterized by gas chromatography-olfactometry and

Organocatalytic enantioselective cross-aldol reactions of aldehydes with isatins: formation of two contiguous quaternary centered 3-substituted 3-hydroxyindol-2-ones.

Fei Xue et al.

Chemistry, an Asian journal, 4(11), 1664-1667 (2009-09-12)

Degradation of isobutyraldehyde and its intermediates in a compost biofilter.

B Sercu et al.

Communications in agricultural and applied biological sciences, 68(2 Pt A), 195-198 (2004-08-07)

This study demonstrates that at low to medium isobutyraldehyde loading rates (191 gm(-3) d(-1)-933 gm(-3) d(-1)), 100% removal efficiencies can be obtained in a compost biofilter. However, increasing the loading rate to 1500-1900 gm(-3) d(-1) caused a drop in degradation

Quantum mechanical predictions of the stereoselectivities of proline-catalyzed asymmetric intermolecular aldol reactions.

S Bahmanyar et al.

Journal of the American Chemical Society, 125(9), 2475-2479 (2003-02-27)

Quantum mechanical calculations were employed to predict the ratio of four stereoisomeric products expected from two complex reactions involving the aldol reactions of cyclohexanone with benzaldehyde or with isobutyraldehyde catalyzed by (S)-proline. Experimental tests of these predictions provide an assessment

1,3-diene probes for detection of triplet carbonyls in biological systems.

Adriana C Velosa et al.

Chemical research in toxicology, 20(8), 1162-1169 (2007-07-17)

Electronically excited triplet carbonyls are formed during the oxidative degradation of polyunsaturated fatty acids, amino acids, and beta-dicarbonyl metabolites. Due to their long lifetime and high alkoxyl radical-like reactivity, triplet carbonyls may initiate deleterious reactions in biological systems. Here we

Comparison of Aroma-Active Volatiles in Oolong Tea Infusions Using GC-Olfactometry, GC-FPD, and GC-MS.

JianCai Zhu et al.

Journal of agricultural and food chemistry, 63(34), 7499-7510 (2015-08-11)

The aroma profile of oolong tea infusions (Dongdingwulong, DDWL; Tieguanyin, TGY; Dahongpao, DHP) were investigated in this study. Gas chromatography-olfactometry (GC-O) with the method of aroma intensity (AI) was employed to investigate the aroma-active compounds in tea infusions. The results

Development of a high throughput screening method to test flavour-forming capabilities of anaerobic micro-organisms.

B A Smit et al.

Journal of applied microbiology, 97(2), 306-313 (2004-07-09)

Development of a fast, automated and reliable screening method for screening of large collections of bacterial strains with minimal handling time. The method is based on the injection of a small headspace sample (100 microl) from culture vials (2 ml)

Highly efficient isobutyraldehyde-mediated epoxidation of cyclic alkenes with dioxygen catalyzed by a novel dimeric manganese(II) complex containing an easy-to-prepare flexible carboxamide ligand.

Hamid Reza Khavasi et al.

Inorganic chemistry, 48(13), 5593-5595 (2009-05-28)

Dioxygen epoxidation of cyclic alkenes into their corresponding epoxides was successfully achieved in good yield by using a novel binuclear manganese carboxamide complex as the catalyst and isobutyraldehyde as the cosubstrate.

Use of gas chromatography-olfactometry to identify key odorant compounds in dark chocolate. Comparison of samples before and after conching.

Christine Counet et al.

Journal of agricultural and food chemistry, 50(8), 2385-2391 (2002-04-04)

After vacuum distillation and liquid-liquid extraction, the volatile fractions of dark chocolates were analyzed by gas chromatography-olfactometry and gas chromatography-mass spectrometry. Aroma extract dilution analysis revealed the presence of 33 potent odorants in the neutral/basic fraction. Three of these had

Energy-gaining formation and catalytic behavior of active structures in a SiO(2)-supported unsaturated Ru complex catalyst for alkene epoxidation by DFT calculations.

Rudy Coquet et al.

Physical chemistry chemical physics : PCCP, 9(45), 6040-6046 (2007-11-16)

The formation and catalytic behavior of active structures in a SiO(2)-supported unsaturated Ru complex catalyst for alkene epoxidation were studied by means of hybrid density functional theory (DFT) calculations. An energy-gaining route for the catalyst activation was found to allow

Stereospecific synthesis of alkyl-substituted vicinal diamines from the mother diamine: overcoming the "intrinsic barrier" to the diaza-Cope rearrangement reaction.

Hyunwoo Kim et al.

Organic letters, 11(1), 157-160 (2008-12-10)

Addition of isobutyraldehyde to 1,2-bis(2-hydroxyphenyl)-1,2-diaminoethane (mother diamine) cleanly gives a stable, fused imidazolidine-dihydro-1,3-oxazine ring complex. However, vigorous heating of the fused ring complex gives the diaza-Cope rearrangement product with excellent yield and stereoselectivity. A variety of alkyl aldehydes have been

Structural characterization of new malvidin 3-glucoside-catechin aryl/alkyl-linked pigments.

João Pissarra et al.

Journal of agricultural and food chemistry, 52(17), 5519-5526 (2004-08-19)

The condensation reaction between malvidin 3-glucoside and catechin mediated by isobutyraldehyde, benzaldehyde, and isovaleraldehyde was conducted in model solutions at two pH values (1.5 and 3.2). The formation of new alkyl/aryl-linked adducts corresponding to the structures malvidin 3-glucoside-isobutylcatechin, malvidin 3-glucoside-benzylcatechin

Analysis of volatile organic compounds liberated and metabolised by human umbilical vein endothelial cells (HUVEC) in vitro.

Paweł Mochalski et al.

Cell biochemistry and biophysics, 71(1), 323-329 (2014-08-16)

Gas chromatography with mass spectrometric detection combined with head-space needle trap extraction as the pre-concentration technique was applied to identify and quantify volatile organic compounds released or metabolised by human umbilical vein endothelial cells. Amongst the consumed species there were

Characterization of nutty flavor in cheddar cheese.

Y K Avsar et al.

Journal of dairy science, 87(7), 1999-2010 (2004-08-26)

The objectives of this study were to determine the volatile components responsible for the sensory perception of nutty flavor in Cheddar cheese. Cheddar cheeses with and without nutty flavors were selected by descriptive sensory analysis. Volatile aroma components from Cheddar

Enantioselective Michael addition of isobutyraldehyde to nitroalkenes organocatalyzed by chiral primary amine-guanidines.

Avila A, et al.

Tetrahedron Asymmetry, 25(5), 462-467 (2014)

Mechanism of the hydroxyl radical oxidation of methacryloyl peroxynitrate (MPAN) and its pathway toward secondary organic aerosol formation in the atmosphere.

Tran B Nguyen et al.

Physical chemistry chemical physics : PCCP, 17(27), 17914-17926 (2015-06-23)

Methacryloyl peroxynitrate (MPAN), the acyl peroxynitrate of methacrolein, has been suggested to be an important secondary organic aerosol (SOA) precursor from isoprene oxidation. Yet, the mechanism by which MPAN produces SOA through reaction with the hydroxyl radical (OH) is unclear.

Convergent and divergent effects of odors and emotions in depression.

Bettina M Pause et al.

Psychophysiology, 40(2), 209-225 (2003-06-25)

The aim of the present study was to investigate the similarities and differences in the olfactory and visual processing of emotional stimuli in healthy subjects and in patients with major depressive disorder (MDD). Twenty-five inpatients were investigated after admission to

Alkaline comet assay in liver and stomach, and micronucleus assay in bone marrow, from rats treated with 2-acetylaminofluorene, azidothymidine, cisplatin, or isobutyraldehyde.

A R Kraynak et al.

Mutation research. Genetic toxicology and environmental mutagenesis, 786-788, 77-86 (2015-07-28)

As part of the Japanese Center for the Validation of Alternative Methods (JaCVAM) initiative international validation study of the in vivo rat alkaline comet assay (comet assay), we examined the ability of the assay to determine the genotoxicity of 2-acetylaminofluorene

Structure-guided engineering of Lactococcus lactis alcohol dehydrogenase LlAdhA for improved conversion of isobutyraldehyde to isobutanol.

Xiang Liu et al.

Journal of biotechnology, 164(2), 188-195 (2012-09-15)

We have determined the X-ray crystal structures of the NADH-dependent alcohol dehydrogenase LlAdhA from Lactococcus lactis and its laboratory-evolved variant LlAdhA(RE1) at 1.9Å and 2.5Å resolution, respectively. LlAdhA(RE1), which contains three amino acid mutations (Y50F, I212T, and L264V), was engineered

Orientation to determine quality attributes of flavoring excipients containing volatile molecules.

Florian E Kiene et al.

Journal of pharmaceutical and biomedical analysis, 110, 20-26 (2015-03-24)

Pharmaceutical excipients containing volatile odor-active molecules can be used in pharmaceutical development to increase patients' compliance. However, capturing the molecular composition of these odor-active substances is challenging. Therefore, guidance for the analytical investigation of these excipients should be developed. Using

Degradation of isobutanal at high loading rates in a compost biofilter.

Bram Sercu et al.

Journal of the Air & Waste Management Association (1995), 55(8), 1217-1227 (2005-09-29)

Biofiltration has been increasingly used for cleaning waste gases, mostly containing low concentrations of odorous compounds. To expand the application area of this technology, the biofiltration of higher pollutant loading rates has to be investigated. This article focuses on the

Reactions of cyclohexylisonitrile and isobutyraldehyde with various nucleophiles and catalysts.

McFarland JW.

The Journal of Organic Chemistry, 28(9), 2179-2181 (1963)

Cross-Aldol condensation of isobutyraldehyde and formaldehyde using phase transfer catalyst.

Hashmi A.

Journal of Saudi Chemical Society (2013)

Volatiles, color, and lipid oxidation of broiler breast fillets irradiated before and after cooking.

M Du et al.

Poultry science, 80(12), 1748-1753 (2002-01-05)

Chicken breast fillets were equally divided into three groups. One group was vacuum packaged, cooked in a water bath (cooked-in-bag) at 82 C for 25 min, and then irradiated at 0 or 3 kGy with a linear accelerator (V-C-I). The

Analysis of aldehydes in beer by gas-diffusion microextraction: characterization by high-performance liquid chromatography-diode-array detection-atmospheric pressure chemical ionization-mass spectrometry.

Luís Moreira Gonçalves et al.

Journal of chromatography. A, 1217(24), 3717-3722 (2010-05-11)

In this work, a recently developed extraction technique for sample preparation aiming the analysis of volatile and semi-volatile compounds named gas-diffusion microextraction (GDME) is applied in the chromatographic analysis of aldehydes in beer. Aldehydes-namely acetaldehyde (AA), methylpropanal (MA) and furfural

Chiral picolylamines for Michael and aldol reactions: probing substrate boundaries.

Thomas C Nugent et al.

Organic & biomolecular chemistry, 10(46), 9287-9294 (2012-10-30)

Here we report on inroads concerning increased substrate breadth via the picolylamine organocatalyst template, a vicinal chiral diamine based on a pyridine-primary amine motif. The addition of cyclohexanone to β-nitrostyrene has many catalyst solutions, but cyclopentanone and isobutyraldehyde additions continue

Chemical conversion of alpha-keto acids in relation to flavor formation in fermented foods.

Bart A Smit et al.

Journal of agricultural and food chemistry, 52(5), 1263-1268 (2004-03-05)

Formation of flavor compounds from branched-chain alpha-keto acids in fermented foods such as cheese is believed to be mainly an enzymatic process, while the conversion of phenyl pyruvic acid, which is derived from phenylalanine, also proceeds chemically. In this research

Primary amino acid lithium salt as a catalyst for asymmetric Michael addition of isobutyraldehyde with beta-nitroalkenes.

Atsushi Sato et al.

Chemical communications (Cambridge, England), (46)(46), 6242-6244 (2008-12-17)

Phenylalanine lithium salt was found to be an effective catalyst for asymmetric Michael addition of isobutyraldehyde with beta-nitroalkenes to give quaternary carbon-containing nitroalkanes.

Page 1 of 2