70 results match your criteria Canadian Journal Of Chemistry[Journal]


Dendrimers for Ocular Drug Delivery.

Can J Chem 2017 09 11;95(9):897-902. Epub 2017 May 11.

Department of Chemical & Life Science Engineering, Virginia Commonwealth University, Richmond, VA 23219, United States.

Existing methods of administering ocular drugs are limited in either their safety or efficiency. Nanomedicine therapies have the potential to address this deficiency by creating vehicles that can control drug biodistribution. Dendrimers are synthetic polymeric nanoparticles with a unique highly organized branching structure. Read More

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http://dx.doi.org/10.1139/cjc-2017-0193DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5683719PMC
September 2017
1 Read

Structural features of the carbon-sulfur chemical bond: a semi-experimental perspective.

Can J Chem 2016 12 28;94(12):1065-1076. Epub 2016 Jul 28.

Scuola Normale Superiore, Pisa, Italy.

In this work semi-experimental and theoretical equilibrium geometries of 10 sulfur-containing organic molecules, as well as 4 oxygenated ones, are determined by means of a computational protocol based on density functional theory. The results collected in the present paper further enhance our online database of accurate semi-experimental equilibrium molecular geometries, adding 13 new molecules containing up to 8 atoms, for 12 of which the first semi-experimental equilibrium structure is reported, to the best of our knowledge. We focus in particular on sulfur-containing compounds, aiming both to provide new accurate data on some rather important chemical moieties, only marginally represented in the literature of the field, and to examine the structural features of carbon-sulfur bonds in the light of the previously presented linear regression approach. Read More

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http://www.nrcresearchpress.com/doi/10.1139/cjc-2016-0282
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http://dx.doi.org/10.1139/cjc-2016-0282DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5595238PMC
December 2016
1 Read

Extension and validation of the GLYCAM force field parameters for modeling glycosaminoglycans.

Can J Chem 2016 11 9;94(11):927-935. Epub 2016 Feb 9.

Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, USA.

Glycosaminoglycans (GAGs) are an important class of carbohydrates that serve critical roles in blood clotting, tissue repair, cell migration and adhesion, and lubrication. The variable sulfation pattern and iduronate ring conformations in GAGs influence their polymeric structure and nature of interaction. This study characterizes several heparin-like GAG disaccharides and tetrasaccharides using NMR and molecular dynamics simulations to assist in the development of parameters for GAGs within the GLYCAM06 force field. Read More

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http://www.nrcresearchpress.com/doi/10.1139/cjc-2015-0606
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http://dx.doi.org/10.1139/cjc-2015-0606DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5464424PMC
November 2016
2 Reads

Formation of Hg(II) Tetrathiolate Complexes with Cysteine at Neutral pH.

Can J Chem 2016 Apr 4;94(4):373-379. Epub 2016 Jan 4.

Department of Chemistry, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4.

Mercury(II) ions precipitate from aqueous cysteine (HCys) solutions containing HCys/Hg(II) mole ratio ≥ 2.0 as Hg(-HCys). In absence of additional cysteine, the precipitate dissolves at pH ~12 with the [Hg(-Cys)] complex dominating. Read More

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http://www.nrcresearchpress.com/doi/10.1139/cjc-2015-0375
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http://dx.doi.org/10.1139/cjc-2015-0375DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824553PMC
April 2016
1 Read

Swain-Scott Relationships for Nucleophile Addition to Ring-Substituted Phenonium Ions.

Can J Chem 2015;93(4):428-434. Epub 2014 Sep 8.

Department of Chemistry, University at Buffalo, SUNY, Buffalo, NY 14260, USA.

The products of the reactions of 2-(4-methoxyphenyl)ethyl tosylate () and 2-(4-methyphenyl)ethyl tosylate () with nucleophilic anions were determined for reactions in 50/50 (v/v) trifluoroethanol/water at 25°C. In many cases the nucleophile selectivity / (M) for reactions of nucleophile and solvent, calculated from the ratio of product yields, depends upon [Nu]. This demonstrates the existence of competing reaction pathways, which show different selectivities for reactions with nucleophiles. Read More

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http://dx.doi.org/10.1139/cjc-2014-0337DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4734394PMC
September 2014
2 Reads

Modeling nuclear resonance vibrational spectroscopic data of binuclear non-heme iron enzymes using density functional theory.

Can J Chem 2014 Oct 15;92(10):975-978. Epub 2014 Apr 15.

Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, CA 94305, USA.

Nuclear resonance vibrational spectroscopy (NRVS) is a powerful technique that can provide geometric structural information on key reaction intermediates of Fe-containing systems when utilized in combination with density functional theory (DFT). However, in the case of binuclear non-heme iron enzymes, DFT-predicted NRVS spectra have been found to be sensitive to truncation method used to model the active sites of the enzymes. Therefore, in this study various-level truncation schemes have been tested to predict the NRVS spectrum of a binuclear non-heme iron enzyme, and a reasonably sized DFT model that is suitable for employing the NRVS/DFT combined methodology to characterize binuclear non-heme iron enzymes has been developed. Read More

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http://dx.doi.org/10.1139/cjc-2014-0067DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5607781PMC
October 2014

Contribution of the empirical dispersion correction on the conformation of short alanine peptides obtained by gas-phase QM calculations.

Can J Chem 2013 Sep;91(9):859-865

School of Chemistry, National University of Ireland, Galway, University Road, Galway, Ireland; Complex Carbohydrate Research Center and Department of Chemistry, University of Georgia, Athens, GA 30602, USA.

In this work we analyze the effect of the inclusion of an empirical dispersion term to standard DFT (DFT-D) in the prediction of the conformational energy of the alanine dipeptide (Ala2) and in assessing the relative stabilities of short polyala-nine peptides in helical conformations, i.e., α and 3 helices, from Ala4 to Ala16. Read More

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http://dx.doi.org/10.1139/cjc-2012-0542DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4239032PMC
September 2013

Enantioselective synthesis of ()-tolterodine using lithiation/borylation-protodeboronation methodology.

Can J Chem 2012 Nov;90(11):965

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.

The synthesis of the pharmaceutical ()-tolterodine is reported using lithiation/borylation-protodeboronation of a homoallyl carbamate as the key step. This step was tested with two permutations: an electron-neutral aryl Li-carbamate reacting with an electron-rich boronic ester and an electron-rich aryl Li-carbamate reacting with an electron-neutral boronic ester. It was found that the latter arrangement was considerably better than the former. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3672952PMC
November 2012
4 Reads

Unnatural C-1 homologues of pancratistatin - Synthesis and promising biological activities.

Can J Chem 2012 19;90(11):932-943. Epub 2012 Sep 19.

Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada.

Several C-1 homologues of pancratistatin and 7-deoxypancratistatin were synthesized by a phenanthrene-phenathridone oxidative recyclization strategy. The key steps involved the enzymatic dihydroxylation of bromobenzene, addition of an aryl alane to an epoxyaziridine, an intramolecular aziridine opening on silica gel in solid phase, and the above-mentioned recylization strategy. Experimental and spectral data are reported for all new compounds. Read More

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http://dx.doi.org/10.1139/v2012-073DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5176109PMC
September 2012
5 Reads

Detailed mechanistic investigation into the S-nitrosation of cysteamine.

Can J Chem 2012;9(9):724-738. Epub 2012 Aug 22.

Department of Chemistry, Portland State University, Portland, OR 97207-0751, USA; School of Chemistry, University of KwaZulu-Natal Westville Campus, Private Bag X54001, Durban 4000, Republic of South Africa.

The nitrosation of cysteamine (HNCHCHSH) to produce cysteamine--nitrosothiol (CANO) was studied in slightly acidic medium by using nitrous acid prepared in situ. The stoichiometry of the reaction was HNCHCHSH + HNO → HNCHCHSNO + HO. On prolonged standing, the nitrosothiol decomposed quantitatively to yield the disulfide, cystamine: 2HNCHCHSNO → HNCHCHS-SCHCHNH + 2NO. Read More

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http://dx.doi.org/10.1139/v2012-051DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4651662PMC
August 2012
8 Reads

-Hydroxyphenacyl photoremovable protecting groups - Robust photochemistry despite substituent diversity.

Can J Chem 2011 Feb;89(3):364-384

Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland.

A broadly based investigation of the effects of a diverse array of substituents on the photochemical rearrangement of hydroxyphenacyl esters has demonstrated that common substituents such as F, MeO, CN, COR, CONH, and CH have little effect on the rate and quantum efficiencies for the photo-Favorskii rearrangement and the release of the acid leaving group or on the lifetimes of the reactive triplet state. A decrease in the quantum yields across all substituents was observed for the release and rearrangement when the photolyses were carried out in buffered aqueous media at pHs that exceeded the ground-state p of the chromophore where the conjugate base is the predominant form. Otherwise, substituents have only a very modest effect on the photoreaction of these robust chromophores. Read More

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http://dx.doi.org/10.1139/V10-143DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3891043PMC
February 2011
16 Reads
7 Citations
1.061 Impact Factor

Resonance Assignments and Secondary Structure Analysis of Dynein Light Chain 8 by Magic Angle Spinning NMR Spectroscopy.

Can J Chem 2011 4;89(7):909-918. Epub 2011 Aug 4.

Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, United States.

Dynein light chain LC8 is the smallest subunit of the dynein motor complex and has been shown to play important roles in both dynein dependent and dynein independent physiological functions via its interaction with a number of its binding partners. It has also been linked to pathogenesis including roles in viral infections and tumorigenesis. Structural information for LC8-target proteins is critical to understanding the underlying function of LC8 in these complexes. Read More

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http://dx.doi.org/10.1139/v11-030DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3521606PMC
August 2011
3 Reads

Reconciling solvent effects on rotamer populations in carbohydrates - A joint MD and NMR analysis.

Can J Chem 2006 Apr;84(4):569-579

Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, USA.

The rotational preferences of the hydroxymethyl group in pyranosides is known to depend on the local environment, whether in solid, solution, or gas phase. By combining molecular dynamics (MD) simulations with NMR spectroscopy the rotational preferences for the ω angle in methyl 2,3-di--methyl-α-D-glucopyranoside () and methyl 2,3-di--methyl-α-D-galactopyranoside () in a variety of solvents, with polarities ranging from 80 to 2.3 D have been determined. Read More

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http://dx.doi.org/10.1139/v06-036DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4276422PMC

Effect of Crown Ether Ring Size on Binding and Fluorescence Response to Saxitoxin in Anthracylmethyl Monoaza Crown Ether Chemosensors.

Can J Chem 2006 ;84:1273-1279

Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, U.S.A.

Convenient macrocyclization synthetic routes for the preparation of different-sized monoaza anthracylmethyl crown ether chemsensors (15-crown-5, 18-crown-6, 21-crown-7, 24-crown-8 and 27-crown-9) are described. Evaluation of these crowns as chemosensors for saxitoxin revealed that the larger crowns have moderately higher binding constants, with the 27-crown-9 chemosensor having the largest binding constant: 2.29×10(5) M(-1). Read More

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http://www.nrcresearchpress.com/doi/10.1139/v06-093
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http://dx.doi.org/10.1139/v06-093DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3090159PMC
January 2006
2 Reads

Oxygen insertion in Sesamum indicum furanofuran lignans. Diastereoselective syntheses of enzyme substrate analogues.

Can J Chem 1997 Jun;75(6):840-9

Institute of Biological Chemistry, Washington State University, Pullman 99164-6340, USA.

The furofuran lignans in sesame seed have an unusual oxygen insertion between their furan and aryl rings. In our continuing investigations on the isolation and characterization of the enzyme(s) involved, the diastereoselective syntheses of various substrate analogues for the oxygen insertion step were developed for future substrate specificity and inhibitor studies. This synthetic strategy also provided entry to so-called furofuranone epoxy-lignans, such as salicifoliol from Bupleurum sp. Read More

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Optical properties of poly-HCN and their astronomical applications.

Can J Chem 1994 ;72:678-94

Laboratory for Planetary Studies, Cornell University, Ithaca, NY 14853, USA.

Matthews (1992) has proposed that HCN "polymer" is ubiquitous in the solar system. We apply vacuum deposition and spectroscopic techniques previously used on synthetic organic heteropolymers (tholins), kerogens, and meteoritic organic residues to the measurement of the optical constants of poly-HCN in the wavelength range 0.05-40 micrometers. Read More

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A new apparatus for rapid carbon determination by wet combustion.

Authors:
J A THORN P SHU

Can J Chem 1951 Jul;29(7):558-62

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Analysis of mixtures of simple aliphatic alcohols by partition chromatography.

Authors:
A C NEISH

Can J Chem 1951 Jul;29(7):552-7

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3-bromometameconine.

Can J Chem 1951 Jul;29(7):526-35

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The kinetics of the thermal decomposition of disulphur decafluoride.

Can J Chem 1951 Jun;29(6):508-25

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The dielectric constant of disulphur decafluoride.

Can J Chem 1951 Jun;29(6):494-507

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6-Iodometameconine and 3-iodometahemipinic acid.

Can J Chem 1951 Jun;29(6):482-9

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Preparation of N-substituted ureas from nitrosomethylureas.

Can J Chem 1951 Jun;29(6):478-81

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[Amino acids synthesis from rhodanine].

Authors:
R GAUDRY R A McIVOR

Can J Chem 1951 Jun;29(6):427-38

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The separation of the rare earths by ion-exchange procedures.

Can J Chem 1951 May;29(5):363-71

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The structure of jaborandine; the alkaloid of Piper jaborandi Velloso. I.

Authors:
K WIESNER

Can J Chem 1951 May;29(5):352-4

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The structure of sedamine.

Can J Chem 1951 May;29(5):347-51

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The polymerization of styrene sensitized by acetyl radicals.

Can J Chem 1951 Apr;29(4):333-46

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Contribution to the study of 4-mono-substituted-3-amino-5-pyrazolones.

Can J Chem 1951 Apr;29(4):328-32

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Eutectic solidification in metals.

Can J Chem 1951 Apr;29(4):320-7

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The significance of the "mercurinium ion" in oxymercuration.

Can J Chem 1951 Apr;29(4):308-19

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Hydrogen overvoltage and potential build-up at copper cathodes.

Can J Chem 1951 Apr;29(4):301-7

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