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Organic chemistry

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https://www.readbyqxmd.com/read/27909986/toxicity-and-pharmacokinetic-profile-for-single-dose-injection-of-aby-029-a-fluorescent-anti-egfr-synthetic-affibody-molecule-for-human-use
#1
Kimberley S Samkoe, Jason R Gunn, Kayla Marra, Sally M Hull, Karen L Moodie, Joachim Feldwisch, Theresa V Strong, Daniel R Draney, P Jack Hoopes, David W Roberts, Keith Paulsen, Brian W Pogue
PURPOSE: ABY-029, a synthetic Affibody peptide, Z03115-Cys, labeled with a near-infrared fluorophore, IRDye® 800CW, targeting epidermal growth factor receptor (EGFR) has been produced under good manufacturing practices for a US Food and Drug Administration-approved first-in-use human study during surgical resection of glioma, as well as other tumors. Here, the pharmacology, phototoxicity, receptor activity, and biodistribution studies of ABY-029 were completed in rats, prior to the intended human use...
December 1, 2016: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/27909941/degradation-and-half-life-of-dna-present-in-biomass-from-a-genetically-modified-organism-during-land-application
#2
Mathew C Halter, James A Zahn
White biotechnology has made a positive impact on the chemical industry by providing safer, more efficient chemical manufacturing processes that have reduced the use of toxic chemicals, harsh reaction conditions, and expensive metal catalysts, which has improved alignment with the principles of Green Chemistry. The genetically-modified (GM) biocatalysts that are utilized in these processes are typically separated from high-value products and then recycled, or eliminated. Elimination routes include disposal in sanitary landfills, incineration, use as a fuel, animal feed, or reuse as an agricultural soil amendment or other value-added products...
December 1, 2016: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/27909920/beyond-ferryl-mediated-hydroxylation-40%C3%A2-years-of-the-rebound-mechanism-and-c-h-activation
#3
REVIEW
Xiongyi Huang, John T Groves
Since our initial report in 1976, the oxygen rebound mechanism has become the consensus mechanistic feature for an expanding variety of enzymatic C-H functionalization reactions and small molecule biomimetic catalysts. For both the biotransformations and models, an initial hydrogen atom abstraction from the substrate (R-H) by high-valent iron-oxo species (Fe(n)=O) generates a substrate radical and a reduced iron hydroxide, [Fe(n-1)-OH ·R]. This caged radical pair then evolves on a complicated energy landscape through a number of reaction pathways, such as oxygen rebound to form R-OH, rebound to a non-oxygen atom affording R-X, electron transfer of the incipient radical to yield a carbocation, R(+), desaturation to form olefins, and radical cage escape...
December 1, 2016: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/27907110/electrospray-ionization-efficiency-is-dependent-on-different-molecular-descriptors-with-respect-to-solvent-ph-and-instrumental-configuration
#4
Andreas Kiontke, Ariana Oliveira-Birkmeier, Andreas Opitz, Claudia Birkemeyer
Over the past decades, electrospray ionization for mass spectrometry (ESI-MS) has become one of the most commonly employed techniques in analytical chemistry, mainly due to its broad applicability to polar and semipolar compounds and the superior selectivity which is achieved in combination with high resolution separation techniques. However, responsiveness of an analytical method also determines its suitability for the quantitation of chemical compounds; and in electrospray ionization for mass spectrometry, it can vary significantly among different analytes with identical solution concentrations...
2016: PloS One
https://www.readbyqxmd.com/read/27904956/some-nontoxic-metal-based-drugs-for-selected-prevalent-tropical-pathogenic-diseases
#5
REVIEW
Saliu A Amolegbe, Caroline A Akinremi, Sheriff Adewuyi, Amudat Lawal, Mercy O Bamigboye, Joshua A Obaleye
Metal coordination of bioorganic compounds from both natural and synthetic products is not only gaining recognition in drug design and medicinal inorganic chemistry research, also they are being considered in the improvement of the bioactivity of drugs. What is done in this paper is a review of recent advances in the study of coordination-driven drug delivery, i.e., metal-based drugs (MBDs). The role of some late first row transition metal ions namely Fe, Cu and Zn in the biological activities of metallodrugs such as antimalarials and antimicrobials are highlighted...
November 30, 2016: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/27902861/thioaldehydes-from-aldehyde-hydrogen-sulfide-interaction-under-organocatalysis
#6
Joseph S Francisco, Manoj Kumar
Thioaldehydes are an important class of sulfur compounds involved in atmospheric, synthetic organic and biological chemistry. Traditionally, they are believed to be formed by the nucleophilic attack of bisulfide anion on the carbonyl compounds. Herein we suggest a novel mechanism that does not require the formation of bisulfide anion, but rather involves an interaction between hydrogen sulfide and an aldehyde. Though the uncatalyzed or the water-catalyzed reactions involve high barriers, the formic acid-catalyzed reactions involve moderate barriers that should be accessible in planetary atmospheres...
November 30, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27901014/stacked-antiaromatic-porphyrins
#7
Ryo Nozawa, Hiroko Tanaka, Won-Young Cha, Yongseok Hong, Ichiro Hisaki, Soji Shimizu, Ji-Young Shin, Tim Kowalczyk, Stephan Irle, Dongho Kim, Hiroshi Shinokubo
Aromaticity is a key concept in organic chemistry. Even though this concept has already been theoretically extrapolated to three dimensions, it usually still remains restricted to planar molecules in organic chemistry textbooks. Stacking of antiaromatic π-systems has been proposed to induce three-dimensional aromaticity as a result of strong frontier orbital interactions. However, experimental evidence to support this prediction still remains elusive so far. Here we report that close stacking of antiaromatic porphyrins diminishes their inherent antiaromaticity in the solid state as well as in solution...
November 30, 2016: Nature Communications
https://www.readbyqxmd.com/read/27900432/novel-boronate-material-affords-efficient-enrichment-of-glycopeptides-by-synergized-hydrophilic-and-affinity-interactions
#8
Jianying Chen, Xiaohu Li, Mengyu Feng, Kun Luo, Juan Yang, Bo Zhang
Development of novel materials for enrichment of glycopeptides is the key to a comprehensive analysis of the glycoproteome, which is closely related to several major diseases and biomarker findings. We synthesized phenylboronic acid (PBA) bound to SiO2 microspheres by a thiol-ene click chemistry method (this material was denoted as click PBA) and used it to separate cis-diol-containing molecules and enrich glycopeptides in hydrophilic interaction chromatography mode. Successful preparation of click PBA was confirmed by elemental analysis, X-ray photoelectron spectroscopy, N2 adsorption-desorption isotherms, and high-resolution scanning electron microscopy...
November 29, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27898308/emerging-biopharmaceuticals-from-marine-actinobacteria
#9
REVIEW
Syed Shams Ul Hassan, Komal Anjum, Syed Qamar Abbas, Najeeb Akhter, Bibi Ibtesam Shagufta, Sayed Asmat Ali Shah, Umber Tasneem
Actinobacteria are quotidian microorganisms in the marine world, playing a crucial ecological role in the recycling of refractory biomaterials and producing novel secondary metabolites with pharmaceutical applications. Actinobacteria have been isolated from the huge area of marine organisms including sponges, tunicates, corals, mollusks, crabs, mangroves and seaweeds. Natural products investigation of the marine actinobacteria revealed that they can synthesize numerous natural products including alkaloids, polyketides, peptides, isoprenoids, phenazines, sterols, and others...
November 22, 2016: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/27897295/organosilica-hybrid-nanomaterials-with-a-high-organic-content-syntheses-and-applications-of-silsesquioxanes
#10
REVIEW
Jonas G Croissant, Xavier Cattoën, Jean-Olivier Durand, Michel Wong Chi Man, Niveen M Khashab
Organic-inorganic hybrid materials garner properties from their organic and inorganic matrices as well as synergistic features, and therefore have recently attracted much attention at the nanoscale. Non-porous organosilica hybrid nanomaterials with a high organic content such as silsesquioxanes (R-SiO1.5, with R organic groups) and bridged silsesquioxanes (O1.5Si-R-SiO1.5) are especially attractive hybrids since they provide 20 to 80 weight percent of organic functional groups in addition to the known chemistry and stability of silica...
November 29, 2016: Nanoscale
https://www.readbyqxmd.com/read/27896354/structural-and-dynamic-studies-of-substrate-binding-in-porous-metal-organic-frameworks
#11
REVIEW
Timothy L Easun, Florian Moreau, Yong Yan, Sihai Yang, Martin Schröder
Porous metal-organic frameworks (MOFs) are the subject of considerable research interest because of their high porosity and capability of specific binding to small molecules, thus underpinning a wide range of materials functions such as gas adsorption, separation, drug delivery, catalysis, and sensing. MOFs, constructed by the designed assembly of metal ions and functional organic linkers, are an emerging class of porous materials with extended porous structures containing periodic binding sites. MOFs thus provide a new platform for the study of the chemistry and reactivity of small molecules in confined pores using advanced diffraction and spectroscopic techniques...
November 29, 2016: Chemical Society Reviews
https://www.readbyqxmd.com/read/27894697/an-innovative-ultrasound-assisted-extraction-micro-scale-cell-combined-with-gas-chromatography-mass-spectrometry-in-negative-chemical-ionization-to-determine-persistent-organic-pollutants-in-air-particulate-matter
#12
E Beristain-Montiel, R Villalobos-Pietrini, G E Arias-Loaiza, S L Gómez-Arroyo, O Amador-Muñoz
New clean technologies are needed to determine concentration of organic pollutants without generating more pollution. A method to extract Persistent Organic Pollutants (POPs) from airborne particulate matter was developed using a novel technology recently patented called ultrasound assisted extraction micro-scale cell (UAE-MSC). This technology extracts, filters, collects the sample, and evaporates the solvent, on-line. No sample transfer is needed. The cell minimizes sample manipulation, solvent consumption, waste generation, time, and energy; fulfilling most of the analytical green chemistry protocol...
November 23, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27892466/direct-evidence-for-microbial-derived-soil-organic-matter-formation-and-its-ecophysiological-controls
#13
Cynthia M Kallenbach, Serita D Frey, A Stuart Grandy
Soil organic matter (SOM) and the carbon and nutrients therein drive fundamental submicron- to global-scale biogeochemical processes and influence carbon-climate feedbacks. Consensus is emerging that microbial materials are an important constituent of stable SOM, and new conceptual and quantitative SOM models are rapidly incorporating this view. However, direct evidence demonstrating that microbial residues account for the chemistry, stability and abundance of SOM is still lacking. Further, emerging models emphasize the stabilization of microbial-derived SOM by abiotic mechanisms, while the effects of microbial physiology on microbial residue production remain unclear...
November 28, 2016: Nature Communications
https://www.readbyqxmd.com/read/27891818/exploiting-deep-eutectic-solvents-and-organolithium-reagent-partnerships-chemoselective-ultrafast-addition-to-imines-and-quinolines-under-aerobic-ambient-temperature-conditions
#14
Cristian Vidal, Joaquín García-Álvarez, Alberto Hernán-Gómez, Alan R Kennedy, Eva Hevia
Shattering the long-held dogma that organolithium chemistry needs to be performed under inert atmospheres in toxic organic solvents, chemoselective addition of organolithium reagents to non-activated imines and quinolines has been accomplished in green, biorenewable deep eutectic solvents (DESs) at room temperature and in the presence of air, establishing a novel and sustainable access to amines. Improving on existing methods, this approach proceeds in the absence of additives; occurs without competitive enolization, reduction or coupling processes; and reactions were completed in seconds...
November 28, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27891736/novel-organic-synthesis-through-ultrafast-chemistry
#15
Thomas Wirth
How fast are flashes? The field of flow chemistry has recently received increasing attention owing to the availability of commercial flow equipment. New syntheses with very short-lived intermediates have been enabled by sub-millisecond mixing and reaction regimes in tailor-made flow devices.
November 28, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27891164/a-low-carbohydrate-high-fat-diet-decreases-lean-mass-and-impairs-cardiac-function-in-pair-fed-female-c57bl-6j-mice
#16
Jessica Nilsson, Madelene Ericsson, Masoumeh Motamedi Joibari, Fredrick Anderson, Leif Carlsson, Stefan K Nilsson, Anna Sjödin, Jonas Burén
BACKGROUND: Excess body fat is a major health issue and a risk factor for the development of numerous chronic diseases. Low-carbohydrate diets like the Atkins Diet are popular for rapid weight loss, but the long-term consequences remain the subject of debate. The Scandinavian low-carbohydrate high-fat (LCHF) diet, which has been popular in Scandinavian countries for about a decade, has very low carbohydrate content (~5 E %) but is rich in fat and includes a high proportion of saturated fatty acids...
2016: Nutrition & Metabolism
https://www.readbyqxmd.com/read/27890565/three-generation-reproduction-toxicity-study-of-genetically-modified-rice-with-insect-resistant-genes
#17
Yichun Hu, Qin Zhuo, Zhaolong Gong, Jianhua Piao, Xiaoguang Yang
In the present work, we evaluated the three generation reproductive toxicity of the genetically modified rice with insectresistant cry1Ac and sck genes. 120 Sprague-Dawley (SD) rats were divided into three groups which were fed with genetically modified rice diet (GM group), parental control rice diet (PR group) and AIN-93 control diet (both used as negative control) respectively. Bodyweight, food consumption, reproductive data, hematological parameters, serum chemistry, relative organ weights and histopathology for each generation were examined respectively...
November 24, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27889672/spectroscopic-investigation-and-direct-comparison-of-the-reactivities-of-iron-pyridyl-oxidation-catalysts
#18
Yang Song, Howard G Mayes, Matthew J Queensen, Eike B Bauer, Cynthia M Dupureur
The growing interest in green chemistry has fueled attention to the development and characterization of effective iron complex oxidation catalysts. A number of iron complexes are known to catalyze the oxidation of organic substrates utilizing peroxides as the oxidant. Their development is complicated by a lack of direct comparison of the reactivities of the iron complexes. To begin to correlate reactivity with structural elements, we compare the reactivities of a series of iron pyridyl complexes toward a single dye substrate, malachite green (MG), for which colorless oxidation products are established...
November 19, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27889241/natural-and-synthetic-coral-biomineralization-for-human-bone-revitalization
#19
REVIEW
David W Green, Besim Ben-Nissan, Kyung Sik Yoon, Bruce Milthorpe, Han-Sung Jung
Coral skeletons can regenerate replacement human bone in nonload-bearing excavated skeletal locations. A combination of multiscale, interconnected pores and channels and highly bioactive surface chemistry has established corals as an important alternative to using healthy host bone replacements. Here, we highlight how coral skeletal systems are being remolded into new calcified structures or synthetic corals by biomimetic processes, as places for the organized permeation of bone tissue cells and blood vessels...
November 23, 2016: Trends in Biotechnology
https://www.readbyqxmd.com/read/27886460/the-6th-sino-german-frontiers-of-chemistry-symposium
#20
Lei Jiao, Kathrin Lang
Bilateral Symposium: The Shanghai Institute of Organic Chemistry (SIOC) hosted the 6th Sino-German Frontiers of Chemistry Symposium from August 29 to September 3, 2016. This event, co-organized by the Chinese Chemical Society (CCS) and the Gesellschaft Deutscher Chemiker (German Chemical Society), featured excellent talks by the invited early-career chemists of both countries and offered ample opportunities for discussions and making friends among the participants.
November 25, 2016: Chemistry, An Asian Journal
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