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https://www.readbyqxmd.com/read/28427662/ultrasonic-assisted-synthesis-of-a-tetrazine-functionalized-mof-and-its-application-in-colorimetric-detection-of-phenylhydrazine
#1
Sayed Ali Akbar Razavi, Mohammad Yaser Masoomi, Ali Morsali
TMU-34(-2H), [Zn(OBA)(DPT)0.5].DMF, has been sonochemically synthesized by applying H2OBA, (4,4'-oxybis(benzoic acid)), as the dicarboxylate linker, and DPT, (3,6-di(pyridin-4-yl)-1,2,4,5-tetrazine), as pillar spacer. Sonication time, concentration of initial reagents, sonication power and molar ratio of pyridine as modulator has been optimized to synthesize nano powder of TMU-34(-2H) including uniform plate morphology. Nano TMU-34(-2H), can detect phenylhydrazine (PH) by color changing from pink to deep purple...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28425297/new-approaches-for-itaconic-acid-production-bottlenecks-and-possible-remedies
#2
Richa Bafana, R A Pandey
Currently, growing attention is being devoted to the conversion of biomass into value-added products, such as itaconic acid (IA), which is considered as the cleanest alternative to petroleum-based acrylic acid. IA is an unsaturated dicarboxylic acid that is used as a building block chemical for the production of several value-added products such as poly-itaconic acid. IA and its derivatives have a wide range of potential applications in textile, paint, pharmaceutical and chemical industries. Presently, industries are producing IA on the large scale by fermentation from glucose...
April 20, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28423274/experimental-evidence-of-long-range-intramolecular-vibrational-energy-redistribution-through-eight-covalent-bonds-nir-irradiation-induced-conformational-transformation-of-e-glutaconic-acid
#3
Benjamin Kovács, Nihal Kuş, György Tarczay, Rui Fausto
Long-range intramolecular vibrational energy redistribution (IVR) driven conformational changes were investigated in a matrix-isolated open-chain, asymmetrical dicarboxylic acid, E-glutaconic acid. Although the analysis was challenging due to the presence of multiple backbone conformers and short lifetimes of the prepared higher energy cis conformers, it was unambiguously shown that the selective excitation of the O-H stretching overtone of one of the carboxylic groups can induce the conformational change (trans to cis) of the other carboxylic group, located at the other end of the E-glutaconic acid molecule...
April 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28418420/selective-purification-and-chemical-labeling-of-a-target-protein-on-ruthenium-photocatalyst-functionalized-affinity-beads
#4
Michihiko Tsushima, Shinichi Sato, Hiroyuki Nakamura
Selective purification and chemical labeling of a target protein in a protein mixture were simultaneously achieved on the surface of affinity beads functionalized with ligands, such as benzenesulfonamide and methotrexate (MTX), and a ruthenium complex containing 2,2'-bipyridine-4,4'-dicarboxylic acid (dcbpy). Chemical labeling of the target protein with a tyrosine radical trapper (TRT) proceeded on the surface of the beads when the target protein was in close proximity to the ruthenium photocatalyst. Both the protein purification and chemical labeling abilities of the affinity beads functionalized with ruthenium photocatalyst were not compromised after recycling several times...
April 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28414710/using-the-pimeloyl-coa-synthetase-adenylation-fold-to-synthesize-fatty-acid-thioesters
#5
Menglu Wang, Lucile Moynié, Peter J Harrison, Van Kelly, Andrew Piper, James H Naismith, Dominic J Campopiano
Biotin is an essential vitamin in plants and mammals, functioning as the carbon dioxide carrier within central lipid metabolism. Bacterial pimeloyl-CoA synthetase (BioW) acts as a highly specific substrate-selection gate, ensuring the integrity of the carbon chain in biotin synthesis. BioW catalyzes the condensation of pimelic acid (C7 dicarboxylic acid) with CoASH in an ATP-dependent manner to form pimeloyl-CoA, the first dedicated biotin building block. Multiple structures of Bacillus subtilis BioW together capture all three substrates, as well as the intermediate pimeloyl-adenylate and product pyrophosphate (PPi), indicating that the enzyme uses an internal ruler to select the correct dicarboxylic acid substrate...
April 17, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28403188/molecular-pathways-associated-with-blood-pressure-and-hexadecanedioate-levels
#6
Cristina Menni, Sarah J Metrustry, Georg Ehret, Anna F Dominiczak, Phil Chowienczyk, Tim D Spector, Sandosh Padmanabhan, Ana M Valdes
The dicarboxylic acid hexadecanedioate is associated with increased blood pressure (BP) and mortality in humans and feeding it to rats raises BP. Here we aim to characterise the molecular pathways that influence levels of hexadecanedioate linked to BP regulation, using genetic and transcriptomic studies. The top associations for hexadecanedioate in a genome-wide association scan (GWAS) conducted on 6447 individuals from the TwinsUK and KORA cohorts were tested for association with BP and hypertension in the International Consortium for BP and in a GWAS of BP extremes...
2017: PloS One
https://www.readbyqxmd.com/read/28402643/coverage-dependent-anchoring-of-4-4-biphenyl-dicarboxylic-acid-to-coo-111-thin-films
#7
Susanne Mohr, Tobias Schmitt, Tibor Döpper, Feifei Xiang, Matthias Schwarz, Andreas Görling, M Alexander Schneider, Jörg Libuda
We investigated the adsorption behavior of 4,4'-biphenhyl dicarboxylic acid (BDA) on well-ordered CoO(111) films grown on Ir(100) as a function of coverage and temperature using time-resolved and temperature-programmed infrared reflection absorption spectroscopy (TR-IRAS, TP-IRAS) in combination with density functional theory (DFT) and scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions. To compare the binding behavior of BDA as a function of the oxide film thickness, three different CoO(111) film thicknesses were explored: films of about 20 bilayers (BLs) (approximately 5 nm), 2 BLs, and 1 BL...
April 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28399267/development-of-a-%C3%AE-9-tetrahydrocannabinol-amino-acid-dicarboxylate-prodrug-with-improved-ocular-bioavailability
#8
Goutham R Adelli, Prakash Bhagav, Pranjal Taskar, Tushar Hingorani, Sara Pettaway, Waseem Gul, Mahmoud A ElSohly, Michael A Repka, Soumyajit Majumdar
Purpose: The aim of the present study was to evaluate the utility of the relatively hydrophilic Δ9-tetrahydrocannabinol (THC) prodrugs, mono and di-valine esters (THC-Val and THC-Val-Val) and the amino acid (valine)-dicarboxylic acid (hemisuccinate) ester (THC-Val-HS), with respect to ocular penetration and intraocular pressure (IOP) lowering activity. THC, timolol, and pilocarpine eye drops were used as controls. Methods: THC-Val, THC-Val-Val, and THC-Val-HS were synthesized and chemically characterized...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28398653/the-noble-gas-xenon-provides-protection-and-trophic-stimulation-to-midbrain-dopamine-neurons
#9
Jérémie Lavaur, Déborah Le Nogue, Marc Lemaire, Jan Pype, Géraldine Farjot, Etienne C Hirsch, Patrick P Michel
Despite its low chemical reactivity, the noble gas xenon possesses a remarkable spectrum of biological effects. In particular, xenon is a strong neuroprotectant in preclinical models of hypoxic-ischemic brain injury. In the present study, we wished to determine whether xenon retained its neuroprotective potential in experimental settings that model the progressive loss of midbrain dopamine (DA) neurons in Parkinson's disease (PD). Using rat midbrain cultures, we established that xenon was partially protective for DA neurons through either direct or indirect effects on these neurons...
April 11, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28397904/entropy-in-multiple-equilibria-theory-and-applications
#10
Gion Calzaferri
Analysis of multiple equilibria where the binding enthalpy of the species is the same for all sites and independent of those that are already bonded delivers insight on the evolution of the entropy as the reactions proceed and explains why the equilibrium constants always decrease with increasing number of occupied sites. The validity of the results is independent of the nature of bonding. Consequences are explained by discussing dicarboxylic acids, cation exchange of zeolite A, and the insertion of guests into the one-dimensional channels of zeolite L, by cation exchange for cationic guests and from the gas phase for neutral molecules...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28370438/differential-activities-of-peroxisomes-along-the-mouse-intestinal-epithelium
#11
Petruta L Morvay, Myriam Baes, Paul P Van Veldhoven
The presence of peroxisomes in mammalian intestine has been revealed formerly by catalase staining combined with electron microscopy. Despite the central role of intestine in lipid uptake and the established importance of peroxisomes in different lipid-related pathways, few data are available on the physiological role of peroxisomes in intestinal metabolism, more specifically, α-, β-oxidation, and etherlipid synthesis. Hence, the peroxisomal compartment was analyzed in more detail in mouse intestine. On the basis of immunohistochemistry, the organelles are mainly confined to the epithelial cells...
March 29, 2017: Cell Biochemistry and Function
https://www.readbyqxmd.com/read/28365404/metabolic-engineering-strategies-to-bio-adipic-acid-production
#12
REVIEW
Nicholas S Kruyer, Pamela Peralta-Yahya
Adipic acid is the most industrially important dicarboxylic acid as it is a key monomer in the synthesis of nylon. Today, adipic acid is obtained via a chemical process that relies on petrochemical precursors and releases large quantities of greenhouse gases. In the last two years, significant progress has been made in engineering microbes for the production of adipic acid and its immediate precursors, muconic acid and glucaric acid. Not only have the microbial substrates expanded beyond glucose and glycerol to include lignin monomers and hemicellulose components, but the number of microbial chassis now goes further than Escherichia coli and Saccharomyces cerevisiae to include microbes proficient in aromatic degradation, cellulose secretion and degradation of multiple carbon sources...
March 30, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28360905/improvement-of-the-process-stability-of-arylmalonate-decarboxylase-by-immobilization-for-biocatalytic-profen-synthesis
#13
Miriam Aßmann, Carolin Mügge, Sarah Katharina Gaßmeyer, Junichi Enoki, Lutz Hilterhaus, Robert Kourist, Andreas Liese, Selin Kara
The enzyme arylmalonate decarboxylase (AMDase) enables the selective synthesis of enantiopure (S)-arylpropinates in a simple single-step decarboxylation of dicarboxylic acid precursors. However, the poor enzyme stability with a half-life time of about 1.2 h under process conditions is a serious limitation of the productivity, which results in a need for high catalyst loads. By immobilization on an amino C2 acrylate carrier the operational stability of the (S)-selective AMDase variant G74C/M159L/C188G/V43I/A125P/V156L was increased to a half-life of about 8...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28359677/paclitaxel-dimers-assembling-nanomedicines-for-treatment-of-cervix-carcinoma
#14
Qing Pei, Xiuli Hu, Shi Liu, Yang Li, Zhigang Xie, Xiabin Jing
Poor water solubility and adverse side effects pose a challenge for clinical application of paclitaxel (PTX). In this work, a series of PTX dimers are synthesized by coupling two PTX molecules with dicarboxylic acids. As-synthesized PTX dimers form stable nanoparticles in aqueous solution without using any surfactants or adjuvants, and the solubility of PTX in water increases by 2500-fold compared to that of free PTX. These nanoparticles with high content of PTX are internalized by cancer cells and exhibit comparable cytotoxicity with Taxol...
March 27, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28355054/secondary-organic-aerosol-formation-over-coastal-ocean-inferences-from-atmospheric-water-soluble-low-molecular-weight-organic-compounds
#15
Srinivas Bikkina, Kimitaka Kawamura, Manmohan Sarin
A lack of consensus on the distributions and formation pathways of secondary organic aerosols (SOA) over oceanic regions downwind of pollution sources limits our ability to assess their climate impact globally. As a case study, we report here on water-soluble SOA components such as dicarboxylic acids, oxocarboxylic acids, and α-dicarbonyls in the continental outflows from the Indo-Gangetic Plain (IGP) and Southeast Asia (SEA) to the Bay of Bengal. Oxalic acid (C2) is the dominant species followed by succinic (C4) and glyoxylic acids (ωC2) in the outflow...
April 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28351588/synthesis-and-anti-hiv-activities-of-unsymmetrical-long-chain-dicarboxylate-esters-of-dinucleoside-reverse-transcriptase-inhibitors
#16
Hitesh K Agarwal, Bhupender S Chhikara, Gustavo F Doncel, Keykavous Parang
A series of 11 unsymmetrical dicarboxylate conjugates of dinucleoside reverse transcriptase inhibitors were synthesized. Three dicarboxylic acids, succinic acid, suberic acid and 1,14-tetradecandioc acid, were diesterified with either 3'-azido-2',3'-dideoxythymidine (AZT), 3'-fluoro-2',3'-dideoxythymidine (FLT), 2',3'-dideoxy-3'-thiacytidine (3TC), or 5-fluoro-2',3'-dideoxy-3'-thiacytidine (FTC). The anti-HIV activity of synthesized compounds was evaluated against HIV-1 X4 (IIIB) and R5 (BaL) viral strains in single-round infection assays...
May 1, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28349873/cadmium-spiked-soil-modulates-root-organic-acids-exudation-and-ionic-contents-of-two-differentially-cd-tolerant-maize-zea-mays-l-cultivars
#17
M Tariq Javed, M Sohail Akram, Kashif Tanwir, Hassan Javed Chaudhary, Qasim Ali, Eva Stoltz, Sylvia Lindberg
Our earlier work described that the roots of two maize cultivars, grown hydroponically, differentially responded to cadmium (Cd) stress by initiating changes in medium pH depending on their Cd tolerance. The current study investigated the root exudation, elemental contents and antioxidant behavior of the same maize cultivars [cv. 3062 (Cd-tolerant) and cv. 31P41 (Cd-sensitive)] under Cd stress. Plants were maintained in a rhizobox-like system carrying soil spiked with Cd concentrations of 0, 10, 20, 30, 40 and 50 μmol/kg soil...
March 24, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28349342/in-silico-screening-of-dicarboxylic-acids-for-cocrystallization-with-phenylpiperazine-derivatives-based-on-both-cocrystallization-propensity-and-solubility-advantage
#18
Piotr Cysewski
In silico screening was performed to search for binary solids in which a phenylpiperazine-derivative drug was cocrystallized with a dicarboxylic acid. The phenylpiperazine derivative could be any of 61 such drugs, while the dicarboxylic acid could be any of nine such acids. The uniqueness of this approach was that two criteria had to be fulfilled simultaneously, namely a high propensity for cocrystallization and a sufficient solubility advantage. Using the mixing enthalpies of selected pairs of crystal formers with high affinities for one another permitted the classification of candidates with a high probability of cocrystallization...
April 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28348215/plp-and-gaba-trigger-gabr-mediated-transcription-regulation-in-bacillus-subtilis-via-external-aldimine-formation
#19
Rui Wu, Ruslan Sanishvili, Boris R Belitsky, Jose I Juncosa, Hoang V Le, Helaina J S Lehrer, Michael Farley, Richard B Silverman, Gregory A Petsko, Dagmar Ringe, Dali Liu
The Bacillus subtilis protein regulator of the gabTD operon and its own gene (GabR) is a transcriptional activator that regulates transcription of γ-aminobutyric acid aminotransferase (GABA-AT; GabT) upon interactions with pyridoxal-5'-phosphate (PLP) and GABA, and thereby promotes the biosynthesis of glutamate from GABA. We show here that the external aldimine formed between PLP and GABA is apparently responsible for triggering the GabR-mediated transcription activation. Details of the "active site" in the structure of the GabR effector-binding/oligomerization (Eb/O) domain suggest that binding a monocarboxylic γ-amino acid such as GABA should be preferred over dicarboxylic acid ligands...
March 27, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28345925/metal-insertion-in-a-methylamine-functionalized-zirconium-metal-organic-framework-for-enhanced-carbon-dioxide-capture
#20
A Paulina Gómora-Figueroa, Jarad A Mason, Miguel I Gonzalez, Eric D Bloch, Katie R Meihaus
The reaction of ZrCl4 with 2',3',5',6'-tetramethylamino-p-terphenyl-4,4″-dicarboxylic acid (H2tpdc-4CH2NH2·3HCl) in the presence of NaF affords Zr6O4(OH)2.1F1.9(tpdc-4CH2NH2·3HCl)6 (1), which is a new member of the Zr6O4(OH)4(dicarboxylate linker)12 or UiO-68 family, and exhibits high porosity with BET and Langmuir surface areas of 1910 m(2)/g and 2220 m(2)/g, respectively. Remarkably, fluoride ion incorporation in the zirconium clusters results in increased thermal stability, marking the first example of enhancement in the stability of a UiO framework by this defect-restoration approach...
March 27, 2017: Inorganic Chemistry
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