MilliporeSigma
Search Within
Applied Filters:
Keyword:'138185'
Showing 1-30 of 37 results for "

138185

" within Papers
Junsang Ko et al.
Journal of bacteriology, 187(16), 5782-5789 (2005-08-04)
Methylglyoxal (MG) is a toxic metabolite known to accumulate in various cell types. We detected in vivo conversion of MG to acetol in MG-accumulating Escherichia coli cells by use of (1)H nuclear magnetic resonance ((1)H-NMR) spectroscopy. A search for homologs
A Nakazawa et al.
Cryo letters, 33(3), 202-213 (2012-07-25)
A number of volvocalean green algae species were subjected to a two-step cryopreservation protocol with various cryoprotectants. Potential cryoprotectants were methanol (DMSO), N,N-dimethylformamide (DMF), N,N-dimethylacetamide, N-methylformamide, and hydroxyacetone (HA). We confirmed prior reports that MeOH was effective for cryopreserving Chlamydomonas
Oxidation of glycerol and propanediols in methanol over heterogeneous gold catalysts.
Taarning E, et al.
Green Chemistry, 10(4), 408-414 (2008)
Jinqing Zhou et al.
Organic & biomolecular chemistry, 10(21), 4179-4185 (2012-05-02)
In the current study, a convenient and simple way is presented to synthesize a novel type of supported heterogeneous organocatalyst in 21-81% yield by the copolymerization of 9-amino-9-deoxy-epi-cinchonine organocatalyst with acrylonitrile using AIBN as radical initiator. The chemical compositions (x/y)
I Blank et al.
Advances in experimental medicine and biology, 561, 171-189 (2006-01-28)
The formation of acrylamide (AA) from L-asparagine was studied in Maillard model systems under pyrolysis conditions. While the early Maillard intermediate N-glucosylasparagine generated approximately 2.4 mmol/mol AA, the Amadori compound was a less efficient precursor (0.1 mmol/mol). Reaction with alpha-dicarbonyls
Qi-Xiang Guo et al.
The Journal of organic chemistry, 77(7), 3589-3594 (2012-03-02)
The diastereoselectively switchable enantioselective Mannich reaction of isatin imines with hydroxyacetone is reported. The chiral primary amino acid catalyzed this Mannich reaction to afford both anti- and syn-Mannich adducts in high yields, good diastereoselectivities, and enantioselectivities. The reason for the
Silvina A Peirone et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 15(17), 3848-3854 (2014-09-05)
The products of the gas-phase reactions of OH radicals with 1-pentene and 2-methyl-2-propen-1-ol (221MPO) at T=298±2 K and atmospheric pressure were investigated by using a 4500 L atmospheric simulation chamber that was built especially for this work. The molar yield
Dongzhi Chen et al.
Bioprocess and biosystems engineering, 31(4), 283-289 (2007-09-13)
An amine:hydroxyacetone aminotransferase from an isolated soil bacterium, Moraxella lacunata WZ34, was employed to synthesize alaninol in the presence of hydroxyacetone and isopropylamine in this study. The optimal carbon and nitrogen sources were glycerol and beef extract, respectively. A wide
Rachit Jain et al.
ACS synthetic biology, 4(6), 746-756 (2014-12-10)
The biological production of high value commodity 1,2-propanediol has been established by engineering the glycolysis pathway. However, the simultaneous achievement of high titer and high yield has not been reported yet, as all efforts in increasing the titer have resulted
Ganesh Sriram et al.
Metabolic engineering, 9(5-6), 442-451 (2007-09-25)
Biosynthetically directed fractional (13)C labeling, a popular methodology of metabolic flux analysis, involves culture on a mixture of (13)C and (12)C substrates and preparation a 'metabolic flux analyte' (typically protein hydrolysate) from the biomass. Metabolic flux analytes prepared from complex
Megan N C Grainger et al.
Food chemistry, 232, 648-655 (2017-05-12)
During a study of the conversion of dihydroxyacetone (DHA) to methylglyoxal (MGO) in maturing New Zealand mānuka honey, the kinetics of formation of 5-(hydroxymethyl)furfural (HMF) was studied at temperatures from 4 to 37°C. Formation of HMF was first-order during an
Kanokwan Kongpatpanich et al.
Physical chemistry chemical physics : PCCP, 13(14), 6462-6470 (2011-03-04)
The initial stage of glycerol conversion over H-ZSM-5 zeolite has been investigated using density functional theory (DFT) calculations on an embedded cluster model consisting of 128 tetrahedrally coordinated atoms. It is found that glycerol dehydration to acrolein and acetol proceeds
Terry J Dillon et al.
Physical chemistry chemical physics : PCCP, 8(2), 236-246 (2006-02-17)
Absolute rate coefficients for the title reaction, HO + HOCH(2)C(O)CH(3)--> products (R1) were measured over the temperature range 233-363 K using the technique of pulsed laser photolytic generation of the HO radical coupled to detection by pulsed laser induced fluorescence.
Chen Liu et al.
Organic letters, 13(19), 5248-5251 (2011-09-10)
An efficient direct asymmetric aldol reaction between hydroxyacetone and β,γ-unsaturated α-keto esters has been successfully developed. In the presence of 9-amino-9-deoxy-epi-cinchonine and trifluoroacetic acid, the direct aldol reaction of O-protected hydroxyacetone proceeded in a highly enantioselective manner, affording the desired
Manuel Checa et al.
Nanomaterials (Basel, Switzerland), 9(4) (2019-04-17)
The influence of boron, tungsten and molybdenum modifiers on zirconia-based Pt catalyst was studied for glycerol valorization. Zirconia modified supports were prepared by impregnation of ZrO₂ with either boric, silicontungstic or phosphomolybdic acids to obtain supports with enhanced Brönsted acidic
Eugene Beilin et al.
Journal of pharmaceutical and biomedical analysis, 46(2), 316-321 (2007-12-07)
A method for the quantification of acetol at mug/L levels in propylene glycol and glycerol, two common pharmaceutical excipients, was developed and validated. This simple yet highly specific method makes use of derivatization by O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (PFBHA) in aqueous solution at
Jieni Lian et al.
Bioresource technology, 118, 177-186 (2012-06-19)
The presence of very reactive C1-C4 molecules adversely affects the quality bio-oils produced from the pyrolysis of lignocellulosic materials. In this paper a scheme to produce lipids with Cryptococcus curvatus from the carboxylic acids in the pyrolytic aqueous phase collected
Jacek Mlynarski et al.
Chemical Society reviews, 41(2), 587-596 (2011-07-29)
The key role of carbohydrates in biological processes and their visible existence in our everyday life have stimulated the interest of leading research groups on the smart and simple synthesis of common and rare sugar molecules. Now, more than 120
Rachit Jain et al.
Journal of industrial microbiology & biotechnology, 42(7), 1049-1055 (2015-05-08)
Establishment of novel metabolic pathways for biosynthesis of chemicals, fuels and pharmaceuticals has been demonstrated in Escherichia coli due to its ease of genetic manipulation and adaptability to varying oxygen levels. E. coli growing under microaerobic condition is known to
Hongliang Zhu et al.
Bioresource technology, 149, 238-243 (2013-10-12)
Escherichia coli Lin43 is a strain which has some mutations in glycerol kinase (GlpK) and the repressor for the glycerol 3-phosphate regulon (GlpR). When exposed to glycerol, it quickly accumulates lethal levels of methylglyoxal, which is a precursor of acetol;
Smaro Kokkinidou et al.
Journal of agricultural and food chemistry, 62(32), 8023-8033 (2014-07-30)
The application of phenolic compounds to suppress Maillard chemistry and off-flavor development in ultrahigh-termperature (UHT)-processed milk during processing and storage was investigated. Five phenolic compounds were examined for structure-reactivity relationships (catechin, genistein, daidzein, 1,2,3-trihydroxybenzene, and 1,3,5-trihydroxybenzene). The levels of key
Xianliang Zhou et al.
Environmental science & technology, 43(8), 2753-2759 (2009-05-30)
A method has been modified and optimized for the measurements of hydroxyacetone as well as formaldehyde and glycolaldehyde, based on aqueous scrubbing using a coil sampler followed by DNPH derivatization and HPLC analysis. Derivatization equilibrium and kinetics were studied to
Akshay Kumar et al.
Organic & biomolecular chemistry, 9(8), 2731-2742 (2011-03-02)
A new series of water compatible primary-tertiary diamine catalysts derived from natural primary amino acids bearing a hydrophobic side chain have been synthesized. These new primary-tertiary diamine-Brønsted acid conjugates bifunctional organocatalysts efficiently catalyzes the asymmetric direct syn selective cross-aldol reaction
Teruhiko Ishikawa et al.
The Journal of organic chemistry, 72(2), 435-441 (2007-01-16)
Enolate generated from O-(tetrahydropyran-2-yl)hydroxyacetone under thermodynamically controlled conditions (1.3 equiv of NaH, THF, 0 degrees C to rt) was allylated at the carbon bearing the protected hydroxy group with very high regioselectively. When tert-BuOH, equivalent to the excessive portion of
Insook Kim et al.
Journal of microbiology (Seoul, Korea), 45(4), 339-343 (2007-09-12)
Methylglyoxal (MG) is a reactive metabolite known to accumulate in certain physiological conditions. We attempted to isolate genes associated with this metabolite by genome-wide mutagenesis with TnphoA derivative. After screening on methylglyoxal-containing plate, we obtained insertions in three different genes
Takahiro Oda et al.
Microbial cell factories, 12(1), 2-2 (2013-01-12)
Conversion of industrial processes to more nature-friendly modes is a crucial subject for achieving sustainable development. Utilization of hydrogen-oxidation reactions by hydrogenase as a driving force of bioprocess reaction can be an environmentally ideal method because the reaction creates no
The anticonvulsant activity of acetone does not depend upon its metabolites.
Maciej Gasior et al.
Epilepsia, 49(5), 936-937 (2008-05-06)
Jérôme Lasne et al.
Physical chemistry chemical physics : PCCP, 14(2), 697-704 (2011-11-24)
Oxygenated volatile organic compounds (OVOCs) influence the oxidative properties of the atmosphere, and their transport from the ground may occur by scavenging by the HNO(3)-rich supercooled water droplets found in polluted convective air masses. With infrared spectroscopy, we have studied
Mayela Cepeda-Vázquez et al.
Food chemistry, 245, 1025-1033 (2017-12-31)
A wide range of compounds can be formed during thermal processing of food, some of which are relevant for aroma (e.g., furfural), while others are of great health concern (e.g., furan). This paper presents the study of formulation as affecting
Maciej Gasior et al.
Epilepsia, 48(4), 793-800 (2007-03-28)
Acetone, one of the principal ketone bodies elevated during treatment with the ketogenic diet, exhibits anticonvulsant properties that may contribute to the seizure protection conferred by the diet. The anticonvulsant mechanism of acetone is unknown, but it is metabolized to
Page 1 of 2
Page 1 of 2