W292303

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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

A PEGylation technology of L-asparaginase with monomethoxy polyethylene glycol-propionaldehyde.

Bochu Wang et al.

Zeitschrift fur Naturforschung. C, Journal of biosciences, 67(5-6), 312-318 (2012-08-15)

Polyethylene glycol (PEG) conjugation technology has been successfully applied to improve the performance of protein drugs. In this study, L-asparaginase was N-terminal site-specifically modified by alkylating PEG with monomethoxy polyethylene glycol-propionaldehyde (mPEG-ALD20000). The optimum reaction parameters were determined as pH

Kinetic solvent effects on hydrogen abstraction reactions from carbon by the cumyloxyl radical. The importance of solvent hydrogen-bond interactions with the substrate and the abstracting radical.

Michela Salamone et al.

The Journal of organic chemistry, 76(11), 4645-4651 (2011-04-30)

A kinetic study of the hydrogen atom abstraction reactions from propanal (PA) and 2,2-dimethylpropanal (DMPA) by the cumyloxyl radical (CumO•) has been carried out in different solvents (benzene, PhCl, MeCN, t-BuOH, MeOH, and TFE). The corresponding reactions of the benzyloxyl

In Salmonella enterica, Ethanolamine Utilization Is Repressed by 1,2-Propanediol To Prevent Detrimental Mixing of Components of Two Different Bacterial Microcompartments.

Ryan Sturms et al.

Journal of bacteriology, 197(14), 2412-2421 (2015-05-13)

Bacterial microcompartments (MCPs) are a diverse family of protein-based organelles composed of metabolic enzymes encapsulated within a protein shell. The function of bacterial MCPs is to optimize metabolic pathways by confining toxic and/or volatile metabolic intermediates. About 20% of bacteria

Scrutinizing calcium flux oscillations in T lymphocytes to deduce the strength of stimulus.

Susan N Christo et al.

Scientific reports, 5, 7760-7760 (2015-01-15)

The capture and activation of individual T cells on functionalised surfaces enables real-time analyses of the magnitude and rhythm of intracellular calcium release. Application of Haarlet transformations generate a calcium flux 'threshold', with the frequency of the 'threshold crossings' correlating

Zebrafish 10-formyltetrahydrofolate dehydrogenase is similar to its mammalian isozymes for its structural and catalytic properties.

Wen-Ni Chang et al.

Protein expression and purification, 72(2), 217-222 (2010-04-13)

10-Formyltetrahydrofolate dehydrogenase from zebrafish has been cloned and expressed in both Escherichia coli and yeast. In addition, the N-terminal and C-terminal domains have also been cloned and expressed. Each expressed protein was purified to homogeneity and structural and kinetic properties

Carbonyl compound emissions from a heavy-duty diesel engine fueled with diesel fuel and ethanol-diesel blend.

Chonglin Song et al.

Chemosphere, 79(11), 1033-1039 (2010-04-27)

This paper presents an investigation of the carbonyl emissions from a direct injection heavy-duty diesel engine fueled with pure diesel fuel (DF) and blended fuel containing 15% by volume of ethanol (E/DF). The tests have been conducted under steady-state operating

Chemical hazards present in liquids and vapors of electronic cigarettes.

Christoph Hutzler et al.

Archives of toxicology, 88(7), 1295-1308 (2014-06-25)

Electronic (e-)cigarettes have emerged in recent years as putative alternative to conventional tobacco cigarettes. These products do not contain typical carcinogens that are present in tobacco smoke, due to the lack of combustion. However, besides nicotine, hazards can also arise

Interactions between the termini of lumen enzymes and shell proteins mediate enzyme encapsulation into bacterial microcompartments.

Chenguang Fan et al.

Proceedings of the National Academy of Sciences of the United States of America, 109(37), 14995-15000 (2012-08-29)

Bacterial microcompartments (MCPs) are a widespread family of proteinaceous organelles that consist of metabolic enzymes encapsulated within a protein shell. For MCPs to function specific enzymes must be encapsulated. We recently reported that a short N-terminal targeting sequence of propionaldehyde

Genetic analysis of the protein shell of the microcompartments involved in coenzyme B12-dependent 1,2-propanediol degradation by Salmonella.

Shouqiang Cheng et al.

Journal of bacteriology, 193(6), 1385-1392 (2011-01-18)

Hundreds of bacterial species use microcompartments (MCPs) to optimize metabolic pathways that have toxic or volatile intermediates. MCPs consist of a protein shell encapsulating specific metabolic enzymes. In Salmonella, an MCP is used for 1,2-propanediol utilization (Pdu MCP). The shell

Onion flavor and odor, the volatile flavor components of onions.

Carson JF & Wong FF

Journal of Agricultural and Food Chemistry, 9(2), 140-143 (1961)

High-performance liquid chromatographic determination of short-chain aliphatic aldehydes using 4-(N,N-dimethylaminosulphonyl)-7-hydrazino-2,1, 3-benzoxadiazole as a fluorescence reagent.

K Nakashima et al.

Journal of chromatography. B, Biomedical applications, 661(2), 205-210 (1994-11-18)

High-performance liquid chromatographic determination of four short-chain aliphatic aldehydes using fluorescence detection was carried out with 4-(N,N-dimethylaminosulphonyl)-7-hydrazino-2, 1,3-benzoxadiazole (DBD-H). DBD-H derivatives with three aliphatic aldehydes--formaldehyde, acetaldehyde and propionaldehyde--were synthesized and their fluorescence properties were examined. Relative fluorescence intensities of these

Volatile Phoducts of Apples III. Identification of Aldehydes and Ketones.

Huelin FE

Australian Journal of Biological Sciences, 5(3), 328-334 (1952)

Development of a high-throughput in vitro assay to identify selective inhibitors for human ALDH1A1.

Cynthia A Morgan et al.

Chemico-biological interactions, 234, 29-37 (2014-12-03)

The human aldehyde dehydrogenase (ALDH) superfamily consists of at least 19 enzymes that metabolize endogenous and exogenous aldehydes. Currently, there are no commercially available inhibitors that target ALDH1A1 but have little to no effect on the structurally and functionally similar

Odor detection by humans of lineal aliphatic aldehydes and helional as gauged by dose-response functions.

J Enrique Cometto-Muñiz et al.

Chemical senses, 35(4), 289-299 (2010-03-02)

We have measured concentration detection (i.e., psychometric) functions to determine the odor detectability of homologous aliphatic aldehydes (propanal, butanal, hexanal, octanal, and nonanal) and helional. Subjects (16 < or = n < or = 18) used a 3-alternative forced-choice procedure

Synthesis, luminescence, and electrochemical studies of a new series of octanuclear ruthenium(II) complexes of tolylterpyridine appended calixresorcarenes.

Selvam Amudhan Senthan et al.

Dalton transactions (Cambridge, England : 2003), 44(33), 14813-14822 (2015-07-30)

A new series of octanuclear Ru(ii) complexes of tolylterpyridine appended calixresorcarenes [{Ru(ttpy)}8()](PF6)16 (), [{Ru(ttpy)}8()](PF6)16 (), and [{Ru(ttpy)}8()](PF6)16 () [ = 2,8,14,20-tetraethyl-4,6,10,12,16,18,22,24-octa(4'-p-benzyloxy-(2,2':6',2''-terpyridinyl))calix[4]resorcarene; = 2,8,14,20-tetraphenyl-4,6,10,12,16,18,22,24-octa(4'-p-benzyloxy-(2,2':6',2''-terpyridinyl))calix[4]resorcarene; and = 2,8,14,20-tetra-p-tolyl-4,6,10,12,16,18,22,24-octa(4'-p-benzyloxy-(2,2':6',2''-terpyridinyl))calix[4]resorcarene] have been synthesized and characterized. The tetraethyl-, tetraphenyl-, and tetra-p-tolylcalixresorcarenes (), (), and ()

Water sorption of CH3- and CF3-Bis-GMA based resins with additives.

Anuradha Prakki et al.

Journal of applied oral science : revista FOB, 20(4), 472-477 (2012-10-04)

To evaluate the effect of additives on the water sorption characteristics of Bis-GMA based copolymers and composites containing TEGDMA, CH3Bis-GMA or CF3Bis-GMA. Fifteen experimental copolymers and corresponding composites were prepared combining Bis-GMA and TEGDMA, CH3Bis-GMA or CF3Bis-GMA, with aldehyde or

Mosciano, G.

Perfumer & Flavorist, 26, 80-80 (2001)

Directed evolution to re-adapt a co-evolved network within an enzyme.

John Strafford et al.

Journal of biotechnology, 157(1), 237-245 (2011-12-14)

We have previously used targeted active-site saturation mutagenesis to identify a number of transketolase single mutants that improved activity towards either glycolaldehyde (GA), or the non-natural substrate propionaldehyde (PA). Here, all attempts to recombine the singles into double mutants led

Measurement of n-alkanals and hydroxyalkenals in biological samples.

A E Holley et al.

Free radical biology & medicine, 15(3), 281-289 (1993-09-01)

A modified method was developed to measure nM levels of a range of n-alkanals and hydroxyalkenals in biological samples such as blood plasma and tissue homogenates and also in Folch lipid extracts of these samples. Butylated hydroxytoluene (BHT) and desferrioxamine

Behavioral effects of glucocorticoids during the first exposures to the forced swim stress.

Galina T Shishkina et al.

Psychopharmacology, 232(5), 851-860 (2014-08-20)

Glucocorticoids facilitate coping with stress, but their high levels have been also implicated in mood disorders. Due to this duality, the role of glucocorticoid signaling in the development of the first episodes of stress-induced depression remains unclear. To address this

Planar oxide supported rhodium nanoparticles as model catalysts.

Sean M McClure et al.

Proceedings of the National Academy of Sciences of the United States of America, 108(3), 931-936 (2010-10-16)

C(2)H(4)/CO/H(2) reaction is investigated on Rh/SiO(2) model catalyst surfaces. Kinetic reactivity and infrared spectroscopic measurements are investigated as a function of Rh particle size under near atmospheric reaction conditions. Results show that propionaldehyde turnover frequency (TOF) (CO insertion pathway) exhibits

Condensation reactions of 3-oxo-2-arylhydrazonopropanals with active methylene reagents: formation of 2-hydroxy- and 2-amino-6-substituted-5-arylazonicotinates and pyrido[3,2-c]cinnolines via 6π-electrocyclization reactions.

Saleh M Al-Mousawi et al.

Molecules (Basel, Switzerland), 17(6), 6547-6556 (2012-06-26)

3-Oxo-3-phenyl-2-(p-tolylhydrazono)propanal (1a) undergoes condensation with ethyl cyanoacetate in acetic acid in the presence of ammonium acetate to yield either 2-hydroxy-6-phenyl-5-p-tolylazonicotinic acid ethyl ester (6a) or 2-amino-6-phenyl-5-ptolyl-azonicotinic acid ethyl ester (8), depending on the reaction conditions. Similarly, other 3-oxo-3-aryl-2-arylhydrazonopropanals 1a,b condense

Unraveling the hydroxypropionaldehyde (HPA) system: an active antimicrobial agent against human pathogens.

Sabine Vollenweider et al.

Journal of agricultural and food chemistry, 58(19), 10315-10322 (2010-09-18)

The hydroxypropionaldehyde (HPA) system is a natural defense system synthesized by the probiotic bacterium Lactobacillus reuteri. To elucidate which of the molecules composing the HPA system (3-hydroxypropionaldehyde (3-HPA), reuterin (HPA dimer), and HPA hydrate) is responsible for the potent antimicrobial

Gene cloning and biochemical characterization of a NAD(P)+ -dependent aldehyde dehydrogenase from Bacillus licheniformis.

Huei-Fen Lo et al.

Molecular biotechnology, 46(2), 157-167 (2010-05-25)

A putative aldehyde dehydrogenase (ALDH) gene, ybcD (gene locus b1467), was identified in the genome sequence of Bacillus licheniformis ATCC 14580. B. licheniformis ALDH (BlALDH) encoded by ybcD consists of 488 amino acid residues with a molecular mass of approximately

Chemiluminescence immunoassay using magnetic nanoparticles with targeted inhibition for the determination of ochratoxin A.

Sumin Kim et al.

Talanta, 140, 183-188 (2015-06-07)

In this work, a chemiluminescence (CL) immunoassay with targeted inhibition was developed for the determination of toxins in food products. For sample treatment, amine-functionalized magnetic nanoparticles (MNPs) were synthesized to extract target molecules, and horseradish peroxidase (HRP) tagged on an

Determination of acrolein by headspace solid-phase microextraction gas chromatography and mass spectrometry.

S Takamoto et al.

Journal of chromatography. B, Biomedical sciences and applications, 758(1), 123-128 (2001-08-03)

We developed a headspace solid-phase microextraction (headspace SPME) method to measure acrolein in human urine. This new technique resolves some problems with the headspace gas chromatography and mass spectrometry (GC-MS) method which we developed previously. With the original method, a

A gas chromatographic--mass spectrometric study of profiles of volatile metabolites in hepatic encephalopathy.

E M Goldberg et al.

Journal of chromatography, 226(2), 291-299 (1981-12-11)

Volatile organic substances present in blood plasma and cerebrospinal fluids of certain control groups of human subjects and cirrhotic patients some of whom were suffering from hepatic encephalopathy were quantitatively analysed and identified. A rapid, reproducible, direct injection capillary column

Conformationally selective photodissociation dynamics of propanal cation.

Hongli Tao et al.

The Journal of chemical physics, 134(5), 054313-054313 (2011-02-10)

We have previously reported experimental evidence for conformationally selective dissociation of propanal cation that was interpreted, on the basis of ab initio multiple spawning calculations, as arising from distinct dynamics in the excited state manifold of the cation. Two conical

Approaches of aroma extraction dilution analysis (AEDA) for headspace solid phase microextraction and gas chromatography-olfactometry (HS-SPME-GC-O): Altering sample amount, diluting the sample or adjusting split ratio?

Yunzi Feng et al.

Food chemistry, 187, 44-52 (2015-05-16)

Aroma extract dilution analysis (AEDA) is widely used for the screening of aroma-active compounds in gas chromatography-olfactometry (GC-O). In this study, three aroma dilution methods, (I) using different test sample volumes, (II) diluting samples, and (III) adjusting the GC injector

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