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Letteratura scientifica selezionata sul tema "Enantiomers"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Enantiomers"

Zhou, Juan, Qiao Chen, Li-lan Wang, Yong-hua Wang e Ying-zi Fu. "Chiral Discrimination of Tryptophan Enantiomers via (1R, 2R)-2-Amino-1, 2-Diphenyl Ethanol Modified Interface". International Journal of Electrochemistry 2011 (2011): 1–6. http://dx.doi.org/10.4061/2011/502364.

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The paper reported that a simple chiral selective interface constructed by (1R, 2R)-2-amino-1, 2-diphenyl ethanol had been developed to discriminate tryptophan enantiomers. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used for the characteristic analysis of the electrode. The results indicated that the interface showed stable and sensitive property to determine the tryptophan enantiomers. Moreover, it exhibited the better stereoselectivity for L-tryptophan than that for D-tryptophan. The discrimination characteristics of the chiral selective interface for discriminating tryptophan enantiomers, including the response time, the effect of tryptophan enantiomers concentration, and the stability, were investigated in detail. In addition, the chiral selective interface was used to determine the enantiomeric composition of L- and D-tryptophan enantiomer mixtures by measuring the relative change of the peak current as well as in pure enantiomeric solutions. These results suggested that the chiral selective interface has the potential for enantiomeric discrimination of tryptophan enantiomers.

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Coles, Simon, David Davies, Michael Hursthouse, Serkan Yeşilot, Bünyemin Çoşut e Adem Kılıç. "Absolute structure determination as a reference for the enantiomeric resolution of racemic mixtures of cyclophosphazenes via chiral high-performance liquid chromatography". Acta Crystallographica Section B Structural Science 65, n. 3 (2 maggio 2009): 355–62. http://dx.doi.org/10.1107/s0108768109006120.

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Reversed-phase chiral high-performance liquid chromatography (HPLC) is a potentially powerful technique for the enantiomeric resolution of racemic mixtures, although the elution order of enantiomers is only relative and it is necessary to fully characterize reference systems for this method to provide absolute configurational information. The enantiomeric resolution of a series of racemic di-spiro cyclotriphosphazene derivatives, N3P3 X 2[O(CH2)3NH]2 (X = Cl, Ph, SPh, NHPh, OPh) [(1)–(5), respectively] was carried out by reversed-phase chiral HPLC on a commercially available Pirkle-type chiral stationary phase (R,R)-Whelk-01 using 85:15 (v/v) hexane–thf as the mobile phase. The absolute configurations of the resulting enantiomers of compounds (3) (X = SPh) and (5) (X = OPh) were determined unambiguously by X-ray crystallography. For both (3) and (5) it was found that the SS enantiomer eluted before the RR enantiomer, indicating a convenient method to determine the absolute configurations of enantiomers of this series of cyclophosphazene derivatives and providing the first set of enantiomeric reference compounds for cyclophosphazene derivatives. These structures demonstrate an interesting anomaly in that the pair of enantiomers of (3) crystallize in enantiomorphically paired space groups whilst, under the same conditions, the solid-state forms of the enantiomers of (5) form structures in Sohncke space groups that are not enantiomorphous.

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Saufi, Ahmad, Cosima B. I. von Heimendahl, A. Wilhelm Alfermann e Elisabeth Fuss. "Stereochemistry of Lignans in Phaleria macrocarpa (Scheff.) Boerl." Zeitschrift für Naturforschung C 63, n. 1-2 (1 febbraio 2008): 13–16. http://dx.doi.org/10.1515/znc-2008-1-203.

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Phaleria macrocarpa (Scheff.) Boerl., a member of the Thymelaeaceae, is traditionally used in Indonesia as medicinal plant against cancer. In this context, we isolated the lignans pinoresinol, lariciresinol and matairesinol from different parts of this plant. The enantiomeric composition of these lignans was determined by chiral column analysis. Pinoresinol and lariciresinol were mixtures of both enantiomers with (79 ± 4)% and (55 ± 6)% enantiomeric excess for the (−)-enantiomers, respectively, whereas matairesinol was found as pure (+)-enantiomer.

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Costa, Ana Rita, Virgínia M. F. Gonçalves, Bruno B. Castro, João Soares Carrola, Ivan Langa, Ariana Pereira, Ana Rita Carvalho, Maria Elizabeth Tiritan e Cláudia Ribeiro. "Toxicity of the 3,4-Methylenedioxymethamphetamine and Its Enantiomers to Daphnia magna after Isolation by Semipreparative Chromatography". Molecules 28, n. 3 (2 febbraio 2023): 1457. http://dx.doi.org/10.3390/molecules28031457.

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MDMA (3,4-methylenedioxymethamphetamine) is a chiral psychoactive recreational drug sold in illicit markets as racemate. Studies on the impact of MDMA on aquatic organisms are scarce. While enantioselectivity in toxicity in animals and humans has been reported, none is reported on aquatic organisms. This study aimed to investigate the ecotoxicological effects of MDMA and its enantiomers in Daphnia magna. For that, enantiomers (enantiomeric purity > 97%) were separated by liquid chromatography using a homemade semipreparative chiral column. Daphnids were exposed to three concentrations of (R,S)-MDMA (0.1, 1.0 and 10.0 µg L−1) and two concentrations of (R)- and (S)-enantiomers (0.1 and 1.0 µg L−1) over the course of 8 days. Morphophysiological responses were dependent on the substance form and daphnia development stage, and they were overall not affected by the (R)-enantiomer. Changes in swimming behaviour were observed for both the racemate and its enantiomers, but enantioselective effects were not observed. Reproductive or biochemical changes were not observed for enantiomers whereas a significant decrease in acetylcholinesterase and catalase activity was noted at the highest concentration of (R,S)-MDMA (10 µg L−1). Overall, this study showed that sub-chronic exposure to MDMA racemate and its enantiomers can interfere with morphophysiological and swimming behaviour of D. magna. In general, the (R)-enantiomer demonstrated less toxicity than the (S)-enantiomer.

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Dutta, Soham, e Andrew J. Gellman. "2D Ising Model for Enantiomer Adsorption on Achiral Surfaces: L- and D-Aspartic Acid on Cu(111)". Entropy 24, n. 4 (18 aprile 2022): 565. http://dx.doi.org/10.3390/e24040565.

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The 2D Ising model is well-formulated to address problems in adsorption thermodynamics. It is particularly well-suited to describing the adsorption isotherms predicting the surface enantiomeric excess, ees, observed during competitive co-adsorption of enantiomers onto achiral surfaces. Herein, we make the direct one-to-one correspondence between the 2D Ising model Hamiltonian and the Hamiltonian used to describe competitive enantiomer adsorption on achiral surfaces. We then demonstrate that adsorption from racemic mixtures of enantiomers and adsorption of prochiral molecules are directly analogous to the Ising model with no applied magnetic field, i.e., the enantiomeric excess on chiral surfaces can be predicted using Onsager’s solution to the 2D Ising model. The implication is that enantiomeric purity on the surface can be achieved during equilibrium exposure of prochiral compounds or racemic mixtures of enantiomers to achiral surfaces.

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Wang, Peng, Donghui Liu, Xu Gu, Shuren Jiang e Zhiqiang Zhou. "Quantitative Analysis of Three Chiral Pesticide Enantiomers by High-Performance Column Liquid Chromatography". Journal of AOAC INTERNATIONAL 91, n. 5 (1 settembre 2008): 1007–12. http://dx.doi.org/10.1093/jaoac/91.5.1007.

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Abstract Methods for the enantiomeric quantitative determination of 3 chiral pesticides, paclobutrazol, myclobutanil, and uniconazole, and their residues in soil and water are reported. An effective chiral high-performance liquid chromatographic (HPLC)-UV method using an amylose-tris(3,5-dimethylphenylcarbamate; AD) column was developed for resolving the enantiomers and quantitative determination. The enantiomers were identified by a circular dichroism detector. Validation involved complete resolution of each of the 2 enantiomers, plus determination of linearity, precision, and limit of detection (LOD). The pesticide enantiomers were isolated by solvent extraction from soil and C18 solid-phase extraction from water. The 2 enantiomers of the 3 pesticides could be completely separated on the AD column using n-hexane isopropanol mobile phase. The linearity and precision results indicated that the method was reliable for the quantitative analysis of the enantiomers. LODs were 0.025, 0.05, and 0.05 mg/kg for each enantiomer of paclobutrazol, myclobutanil, and uniconazole, respectively. Recovery and precision data showed that the pretreatment procedures were satisfactory for enantiomer extraction and cleanup. This method can be used for optical purity determination of technical material and analysis of environmental residues.

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León-González, María Eugenia, e Noelia Rosales-Conrado. "Enantioselective determination of ibuprofen residues by chiral liquid chromatography: a systematic study of enantiomeric transformation in surface water and sediments". Environmental Chemistry 13, n. 4 (2016): 656. http://dx.doi.org/10.1071/en15146.

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Environmental context Ibuprofen, a common anti-inflammatory drug and one of many pharmaceuticals sold as a mixture of enantiomers, has recently been found in river and surface waters. There are, however, few analytical methods able to separate and accurately measure ibuprofen enantiomers in environmental matrices. This study reports a method for quantifying ibuprofen enantiomers in sediments and surface water, and applies it to shed light on the degradation and fate of the enantiomers in aquatic systems. Abstract The enantioselective composition of ibuprofen in sediments in contact with surface water was evaluated over 168h in the presence and absence of light. Multivariate techniques applied for the evaluation of enantiomeric fraction (EF) and recoveries of enantiomers in water and sediments show differences in the EF and composition of each enantiomer. In sediments, differences in the EF are a result of the presence or absence of light, whereas in water it is attributable to degradation of the two enantiomers with time. To achieve enantioselective separation of ibuprofen in surface water and sediments, a clean-up and preconcentration procedure using solid phase extraction combined with a direct chiral liquid chromatography–ultraviolet method was developed. Quantitation limits of the proposed method were between 0.12 and 0.15µgg–1 for each enantiomer in sediments, and between 2.4 and 3.0µgL–1 in surface water. Intra- and inter-day precisions were between 5.1 and 8.9%. Multivariate techniques can be useful to identify enantiomeric modifications and to select the variables that should be used for modelling such transformations.

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Tok, Kenan Can, Mehmet Gumustas, Giorgi Jibuti, Halit Sinan Suzen, Sibel A. Ozkan e Bezhan Chankvetadze. "The Effect of Enantiomer Elution Order on the Determination of Minor Enantiomeric Impurity in Ketoprofen and Enantiomeric Purity Evaluation of Commercially Available Dexketoprofen Formulations". Molecules 25, n. 24 (11 dicembre 2020): 5865. http://dx.doi.org/10.3390/molecules25245865.

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In a recent study, opposite enantiomer elution order was observed for ketoprofen enantiomers on two amylose-phenylcarbamate-based chiral columns with the same chemical composition of the chiral selector but in one case with coated while in the other with an immobilized chiral selector. In the present study, the influence of this uncommon effect on method validation parameters for the determination of minor enantiomeric impurity in dexketoprofen was studied. The validated methods with two alternative elution orders for enantiomers were applied for the evaluation of enantiomeric impurity in six marketed dexketoprofen formulations from various vendors. In most of these formulations except one the content of enantiomeric impurity exceeded 0.1% (w/w).

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Hocking, Martin B., e Aga Z.-Q. Khan. "Chromatographic enantiomer separation and circular dichroism (CD) spectra of three 4-endosubstituted-3,6-diphenyl-3,6-phenylphosphorylcyclohexenes". Canadian Journal of Chemistry 85, n. 9 (1 settembre 2007): 600–602. http://dx.doi.org/10.1139/v07-088.

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Three enantiomeric pairs of Diels–Alder adducts of 2,5-diphenylphosphole-1-oxide have been resolved by elution of each of the enantiomers with 95% ethanol from a swollen microcrystalline triacetylcellulose stationary phase. The degree of separation achieved in each case was confirmed by comparing the absorbance maximum of the UV spectrum of each separated enantiomer with that of a similar concentration of the relevant racemic mixture. The circular dichroism (CD) spectrum of each of the separated enantiomers was recorded, and spectral parameters are listed.Key words: enantiomer separations, three 4-endosubstituted phosphorus-bridged cyclohexenes (phosphanorbornenes), ethanol, microcrystalline triacetylcellulose.

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Kant, Ravi, Ramesh Babu Bodla, Rubina Bhutani e Garima Kapoor. "Enantioselective Box Behenken Optimized HPLC-DAD Method for the Simultaneous Estimation of Alogliptin Enantiomorphs in Pharmaceutical For mulations and their Pharmacokinetic Study in Rat Plasma". Advanced Pharmaceutical Bulletin 9, n. 1 (21 febbraio 2019): 147–58. http://dx.doi.org/10.15171/apb.2019.018.

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Purpose: A stereoselective high performance liquid chromatographic analytical method withphotodiode array detector was developed and validated as per the International Conferenceon Harmonization (ICH) guidelines for the determination of alogliptin (ALO) enantiomers informulations and rat plasma.Methods: Enantiomeric separation was performed on a Phenomenex Lux Cellulose-2 chiralcolumn. Box-Behnken design was used to identify the optimum conditions of the threeindependent variables for the desired output responses.Results: The HPLC peaks of ALO enantiomers and the internal standard pioglitazone wereachieved before 8 min with a resolution of 0.77 min between R and S enantiomer and resolutionof more than 2.0 between each enantiomer and pioglitazone (internal) with more than 95%recovery. The linearity range and the limit of quantification of both the enantiomers in rat plasmawere 10-70 ng mL-1 and 1.2 ng mL-1 respectively.Conclusion: The developed method after validation was successfully applied for estimation ofALO enantiomers in formulations. Single oral dose of 25 mg of the ALO racemate tablets wereadministered to a group of 6 healthy rats for a comparative pharmacokinetic study of both theenantiomers.

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Tesi sul tema "Enantiomers"

Wildervanck, Alexander Franciscus. "Separation of enantiomers of Baclofen". Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/20462.

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(3-(Aminomethyl)-4-chlorobenzenepropanoic acid (Baclofen), 3-(p-chlorophenyl)pyrrolidone (Baclofen lactam) and 3-(p-Chlorophenyl)glutaramide (baclofen's synthetic precursor) were individually used as substrates in co-crystallisation experiments with several resolving agents. Experiments were conducted in the solid state and in solution. The (-) enantiomer of the lactam and the ( +) enantiomer of the glutaramide were found to cocrystallise selectively with (2R,3R)-( +)-tartaric acid and (S)-(-)-a.-Methylbenzylamine respectively. Both these dissociable diastereomers Vere analysed by X-ray crystallography. HPLC analysis of the lactam retrieved from the former co-crystals indicated only partial separation of its (+) and (-) enantiomers. X-ray crystallographic, thermal, and polarimetric analyses were perfom1ed on the ( + )- and (-)-salts of the latter co-crystals. The solubilities of these salts in methanol were found to differ by a factor of 4. A solubility diagram was established showing the phase equilibria of various ratios of these two salts in methanol. The(+) enantiomer of the glutaramide was separated from the methylbenzylamine in the (+) salt by treatment with HCI. This enantiomer was converted to (R)-(-)-Baclofen by means of a Hofinann Rearrangement with an overall yield of 40%. The enantiomeric excess of (R)-(".")-Baclofen was 99.7%.

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Barros, Georgia de Oliveira Figueiredo. "Resolução de misturas racemicas por acoplamento de cristalização a cromatografia em leito movel simulado : estudos fundamentais para a produção de S-cetamina". [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267314.

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Orientador: Everson Alves Miranda
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
Made available in DSpace on 2018-08-04T07:13:28Z (GMT). No. of bitstreams: 1 Barros_GeorgiadeOliveiraFigueiredo_M.pdf: 2282903 bytes, checksum: b104323f697a813ec6af57b15ba7b95b (MD5) Previous issue date: 2005
Resumo: A separação de enantiômetros em altos níveis de pureza enantiomérica é atualmente um requerimento da industria farmacêutica. No entanto, altas purezas estão sendo alcançadas neste sistema com comprometimento da produtividade. O acoplamento do leito móvel simulado (LSM) a uma etapa de cristalização pode resultar num processo de maior produtividade global . A escolha do método de cristalização para a resolução de misturas racêmicas por cristalização é dependente do tipo de cristal (conglomerado ou composto racêmico) e da localização do ponto eutético no diagrama de solubilidade. O ponto eutético difine a mínima puraza enantiomérica que deve ser fornecida pelo LMS para assegurar que a cristalização irá produzir somente um dos enantiômeros puros. A cetamina é um anstésico que possui um isômero R com indesejáveis efeitos colaterais. O objetivo deste trabalho é trabalho é o desenvolvimento de conhecimento básico (identificação do tipo de racemato e seu ponto eutético no diagrama de solubilidade) para o acolplamento do LMS a uma etapa de cristalização a fim de produzir o isômero S da cetamina em pureza enantiomérica e produtividade alta. Para caracterizar a natureza cristalina da cetamina, diração de raios-X e espectroscopia de infravermelho da mistura racêmica e dos enantilômero puros foram realizados e as curvas de solubilidade em função da temperatura foram determinadas...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital
Abstract: The resolution of enantiomers to high levels of enantiomeric purity is presntly a requeriment in the pharmaceutical industry. However, high, purities are reached with this system at the expenses of productivity. Coupling of simulated moving bed (SMB) to a crystallization step can result in a process whith a overall higher productivity. The choise ofcristallization method for the resolution of racemic mixtures is dependent on the eutetic point on the solubility diagram. Eutetic point is the minimum enantiomeric purity that has to be delivered by the SMB to assure that crystallization will produce just one pure isomer. Ketamine is a anesthetic that has a R-isomer with undesirable side-effect. The objective of this work was development of basic knowlwdge for a process (identification of the type of racemate and its eutetic point in the solubility diagram) coupling the SMB to a crystallization step in order to produce the S-isomer of ketamine at high enantiomeric purity and productivity. To characterize the crystalline nature of ketamine, X-ray diffraction and infrared spectroscopy of the racemic mixture and pure enantiomers were performed between powder x-ray pattems, infrared spectra, and solubility curve slopes of the pure enantiomers and racemic mixture indicated racemic compound formation...Note: The complete abstract is available with the full electronic digital thesis or dissertations
Mestrado
Desenvolvimento de Processos Biotecnologicos
Mestre em Engenharia Química

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Bromley, Graham. "Approaches to single enantiomers of cyclopropanes". Thesis, Cardiff Metropolitan University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409442.

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Anandamanoharan, P. "Isolation of enantiomers via diastereomer crystallisation". Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19315/.

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Enantiomer separation remains an important technique for obtaining optically active materials. Even though the enantiomers have identical physical properties, the difference in their biological activities make it important to separate them, in order to use single enantiomer products in the pharmaceutical and fine chemical industries. In this project, the separations of three pairs of diastereomer salts (Fig1) by crystallisation are studied, as examples of the ‘classical’ resolution of enantiomers via conversion to diastereomers. The lattice energies of these diastereomer compounds are calculated computationally (based on realistic potentials for the dominant electrostatic interactions and ab initio conformational energies). Then the experimental data are compared with the theoretical data to study the efficiency of the resolving agent. All three fractional crystallisations occurred relatively slowly, and appeared to be thermodynamically controlled. Separabilities by crystallisation have been compared with measured phase equilibrium data for the three systems studied. All crystallisations appear to be consistent with ternary phase diagrams. In the case of R = CH3, where the salt-solvent ternaries exhibited eutonic behaviour, the direction of isomeric enrichment changed abruptly on passing through the eutonic composition. In another example, R = OH, the ternaries indicated near-ideal solubility behaviour of the salt mixtures, and the separation by crystallisation again corresponded. Further, new polymorphic structures and generally better structure predictions have been obtained through out this study. In the case of R = CH3, an improved structure of the p-salt has been determined. In the case of R = C2H5, new polymorphic forms of the n-salts, II and III, have been both discovered and predicted. This work also demonstrates that chemically related organic molecules can exhibit different patterns of the relative energies of the theoretical low energy crystal structures, along with differences in the experimental polymorphic behaviour. This joint experimental and computational investigation provides a stringent test of the reliability of lattice modelling to explain the origins of chiral resolution via diastereomer formation. All the experimental and computational works investigated in this thesis are published (see APPENDIX 1).

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Zheng, Hui. "Stereoselective pharmacokinetics and metabolism of XK469, a new quinoxaline topoisomerase II beta poison, in the rat". Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1080257372.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xxi, 190 p.; also includes graphics. Includes abstract and vita. Advisor: Kenneth K. Chan, Dept. of Pharmacy. Includes bibliographical references (p. 182-190).

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Kröner, Dominik. "Theory of selective preparation of enantiomers by laser pulses Theorie zur selektiven Präparation von Enantiomeren durch Laserpulse /". [S.l. : s.n.], 2003. http://www.diss.fu-berlin.de/2003/141/index.html.

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Koza, Gani. "Synthesis of single enantiomers of ketomycolic acids". Thesis, Bangor University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488849.

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Toschi, Gianna. "Synthetic approaches to single enantiomers of mycolic acids". Thesis, Bangor University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429853.

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Brookes, Michael H. "The synthesis of the enantiomers of lipoic acid". Thesis, University of Warwick, 1985. http://wrap.warwick.ac.uk/55428/.

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Lipoic acid is a biologically important molecule. Whilst the racemate has been available by a number of syntheses for many years, no convenient preparation of the pure enantiomers has so far been described. All the evidence so far presented indicates that only the dextrorotatory isomer is active in vivo, the absolute configuration of which has not been established with certainty. To further elucidate the biochemical role(s) and biosynthesis of this compound, a convenient EPC synthesis would be beneficial. This thesis describes the development of a route to the (R)- and (S)- forms of the target molecule from a member of the "chiral pool". *******

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McBride, John Joseph. "Development of biosensors for the determination of enantiomers". Thesis, University of Brighton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359142.

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Libri sul tema "Enantiomers"

Todd, Matthew, a cura di. Separation of Enantiomers. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527650880.

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Schurig, Volker, a cura di. Differentiation of Enantiomers I. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-03239-9.

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Schurig, Volker, a cura di. Differentiation of Enantiomers II. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-03716-5.

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André, Coller, e Wilen Samuel H, a cura di. Enantiomers, racemates, and resolutions. Malabar, FL: Krieger Pub. Co., 1991.

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Allenmark, Stig G. Chromatographic enantioseparation: Methods and applications. Chichester, West Sussex, England: E. Horwood, 1988.

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Wren, Stephen. The Separation of Enantiomers by Capillary Electrophoresis. A cura di T. A. Berger, K. S. Boos, H. Engelhardt, E. R. Adlard, I. W. Davies, K. D. Altria e R. Stock. Wiesbaden: Vieweg+Teubner Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-83141-5.

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Wren, Stephen. The Separation of Enantiomers by Capillary Electrophoresis. Wiesbaden: Vieweg+Teubner Verlag, 2001.

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Fumio, Toda, a cura di. Practical methods of enantiomer separation. Boston: Kluwer Academic Publishers, 2004.

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Reid, Eric, Bryan Scales e Ian D. Wilson, a cura di. BIOACTIVE ANALYTES, Including CNS Drugs, Peptides, and Enantiomers. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-1892-8.

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Brookes, Michael H. The synthesis of the enantiomers of lipoic acid. [s.l.]: [typescript], 1985.

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Capitoli di libri sul tema "Enantiomers"

Ellenbroek, Bart, Alfonso Abizaid, Shimon Amir, Martina de Zwaan, Sarah Parylak, Pietro Cottone, Eric P. Zorrilla et al. "Enantiomers". In Encyclopedia of Psychopharmacology, 480. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-68706-1_4233.

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Bada, Jeffrey. "Enantiomers". In Encyclopedia of Astrobiology, 722. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_508.

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Uzir, Mohamad Hekarl. "Enantiomers". In Encyclopedia of Membranes, 697–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_2160.

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Bada, Jeffrey. "Enantiomers". In Encyclopedia of Astrobiology, 487. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_508.

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Uzir, Mohamad Hekarl. "Enantiomers". In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_2160-1.

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Gooch, Jan W. "Enantiomers". In Encyclopedic Dictionary of Polymers, 889. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_13634.

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Oonk, H. A. J., e I. B. Rietveld. "Enantiomers". In Physical Chemistry in Action, 221–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68727-4_9.

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Bada, Jeffrey. "Enantiomers". In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_508-2.

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Bada, Jeffrey. "Enantiomers". In Encyclopedia of Astrobiology, 890. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_508.

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Todd, Matthew. "Introduction: A Survey of How and Why to Separate Enantiomers". In Separation of Enantiomers, 1–12. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527650880.ch1.

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Atti di convegni sul tema "Enantiomers"

Krejčová, Romana, Květoslava Horská, Ivan Votruba e Antonín Holý. "Phosphorylation of enantiomers of HPMPG". In XIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 1999. http://dx.doi.org/10.1135/css199902286.

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Pikuta, Elena V., e Richard B. Hoover. "Utilization of alternate chirality enantiomers in microbial communities". In SPIE Optical Engineering + Applications, a cura di Richard B. Hoover, Gilbert V. Levin, Alexei Y. Rozanov e Paul C. W. Davies. SPIE, 2010. http://dx.doi.org/10.1117/12.862232.

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Mayer, N., D. Ayuso, M. Ivanov e O. Smirnova. "Synthetic chiral vortices for highly-sensitive chiral discrimination". In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.fm4e.5.

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Abstract (sommario):

We combine bicircular vortex beams, creating light that displays chirality in the dipole approximation with azimuthally varying handedness. The chiral vortex leads to a robust and highly-sensitive response in molecular enantiomers with topological properties.

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Huang, Dushu, Wei Liu, Zhaolong Huang, Yashun Chen, Jing Wang e Na Wu. "Enantioseparation of Enantiomers across Hollow Fiber Supported Liquid Membranes". In 2012 International Conference on Biomedical Engineering and Biotechnology (iCBEB). IEEE, 2012. http://dx.doi.org/10.1109/icbeb.2012.195.

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Huang, Dushu, Wei Liu, Lihua Yao, Yong Min, Ruimin Xiao e Yashun Chen. "Enantioseparation of Propranolol Enantiomers Using Hollow Fiber Membrane Contactor". In 2012 International Conference on Biomedical Engineering and Biotechnology (iCBEB). IEEE, 2012. http://dx.doi.org/10.1109/icbeb.2012.197.

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Skachilova, Sofya, e Elena Shilova. "POLYMORPH MODIFICATIONS AND OPTICALLY ACTIVE ENANTIOMERS OF DRUGS, PHARMACOTHERAPY". In XV International interdisciplinary congress "Neuroscience for Medicine and Psychology". LLC MAKS Press, 2019. http://dx.doi.org/10.29003/m557.sudak.ns2019-15/379-380.

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Chen, Huan, Hui Tang, Xue Ying, Xudong Wu e Manjing Jia. "The Pharmacokinetics Study of Gossypol-acetate Enantiomers in Rat". In 2012 International Conference on Biomedical Engineering and Biotechnology (iCBEB). IEEE, 2012. http://dx.doi.org/10.1109/icbeb.2012.432.

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Bychkov, Stanislav S., Boris A. Grishanin e Victor N. Zadkov. "Laser distillation of enantiomers from an isotropic racemic mixture". In International Seminar on Novel Trends in Nonlinear Laser Spectroscopy and High-Precision Measurements in Optics, a cura di Sergei N. Bagaev, Victor N. Zadkov e Sergei M. Arakelian. SPIE, 2001. http://dx.doi.org/10.1117/12.428338.

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Xiao, Ting-Hui, Zhengyi Luo, Kotaro Hiramatsu, Akihiro Isozaki, Tamitake Itoh, Zhenzhou Cheng, Masahiro Nomura, Satoshi Iwamoto e Keisuke Goda. "On-chip chiral-field-enhanced Raman optical activity for biosensing". In Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.cpdp_06.

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Abstract (sommario):

We demonstrate on-chip chiral-field-enhanced Raman optical activity (ROA) by tailoring a dark mode excited in a silicon nanodisk array. We show >100x enhanced chiral light-molecule interaction with negligible artifacts for ROA measurement of biological enantiomers.

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Patsch, Katherin, Chao Liu, Boris Kashemirov, Harish Sura, Grzegorz Zapotoczny, Yuanye Sun, Pavan P. Shah et al. "Abstract 5339: Paradoxical androgen receptor regulation by small molecule enantiomers". In Proceedings: AACR Annual Meeting 2020; April 27-28, 2020 and June 22-24, 2020; Philadelphia, PA. American Association for Cancer Research, 2020. http://dx.doi.org/10.1158/1538-7445.am2020-5339.

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Rapporti di organizzazioni sul tema "Enantiomers"

Liu, Ying. Chromatographic Separations of Enantiomers and Underivatized Oligosaccharides. Office of Scientific and Technical Information (OSTI), gennaio 2004. http://dx.doi.org/10.2172/837283.

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Bae, Sue Y., e Mark D. Winemiller. Separation of VX, RVX and GB Enantiomers Using Liquid ChromatographyTime-of-Flight Mass Spectrometry. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2016. http://dx.doi.org/10.21236/ad1002738.

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Ding, Wei Liang. Capillary electrophoresis separation of neutral organic compounds, pharmaceutical drugs, proteins and peptides, enantiomers, and anions. Office of Scientific and Technical Information (OSTI), febbraio 1999. http://dx.doi.org/10.2172/350830.

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Nazyrov, Marat, e Yulia Yarkaeva. Enantioselective voltammetric sensor system based on mesoporous carbon black Carbopack X and cyclopentadiene derivatives for determination of clopidogrel enantiomers. Peeref, luglio 2023. http://dx.doi.org/10.54985/peeref.2307p5734071.

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Huszthy, P., J. S. Bradshaw, C. Y. Zhu, T. Wang e R. M. Izatt. Recognition of the Enantiomers of Chiral Organic Ammonium Salts by Chiral Dibenzyl- and Diphenyl-Substituted Diamido-or Dithionoamidopyridino-18- crown-6 Ligands. Fort Belvoir, VA: Defense Technical Information Center, marzo 1992. http://dx.doi.org/10.21236/ada248026.

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Bradshaw, Jerald S., e Reed M. Izatt. Principles Guiding Enantiomeric Recognition in Macrocycle-Amine Systems. Fort Belvoir, VA: Defense Technical Information Center, aprile 1991. http://dx.doi.org/10.21236/ada234915.

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Bradshaw, J. S., F. Huszthy, C. W. McDaniel, M. Oue e C. Y. Zhu. Enantiomeric Recognition of Organic Ammonium Salts by Chiral Pyridino- 18-Crown-6 Ligands: A Short Review. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1990. http://dx.doi.org/10.21236/ada228546.

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Desai, Meera Jay. Development of Chiral LC-MS Methods for small Molecules and Their Applications in the Analysis of Enantiomeric Composition and Pharmacokinetic Studies. Office of Scientific and Technical Information (OSTI), gennaio 2004. http://dx.doi.org/10.2172/837266.

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Joshi, Navalkishore N., Chongsuh Pyun, Verinder K. Mahindroo, Bakthan Singaram e Herbert C. Brown. Chiral Synthesis via Organoboranes. 33. The Controlled Reaction of B- Alkydiisopinocampheylboranes with Aldehydes Providing a Convenient Procedure for the Enantiomeric Enrichment of the Boronic Ester Products Through Kinetic Resolution. Fort Belvoir, VA: Defense Technical Information Center, giugno 1991. http://dx.doi.org/10.21236/ada238257.

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