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Artículos de revistas sobre el tema "Enantiomeric purification"

Autor: Grafiati
Publicado: 25 de enero de 2025
Última modificación: 31 de julio de 2025

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1

Choi, Hwa-Jin, and Dong-Yeun Koh. "Homochiral Metal-Organic Framework Based Mixed Matrix Membrane for Chiral Resolution." Membranes 12, no. 4 (2022): 357. http://dx.doi.org/10.3390/membranes12040357.

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Efficient separation of enantiomers is critical in the chemical, pharmaceutical, and food industries. However, conventional separation methods, such as chromatography, crystallization, and enzymatic kinetic resolution, require high energy costs and specific reaction conditions for the efficient purification of one enantiomer. In contrast, membrane-based processes are continuous processes performed with less energy than conventional separation processes. Enantioselective polymer membranes have been developed for the chiral resolution of pharmaceuticals; however, it is difficult to generate suff
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2

Xu, Hong Yu, Zhao Jie Cui, and Jing Liu. "Enantioselective Trace Analysis of Polychlorinated Biphenyl Enantiomers in Soils by GC-ECD/MS." Advanced Materials Research 183-185 (January 2011): 1928–32. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1928.

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A simple method for qualitative and quantitative determination of PCB95, 132, 149 and 174 enantiomers in soils and sediments using GC-ECD/MS was proposed. On the promise of good purification efficiency, high recovery and easy operability, H2SO4 washing and a multi-layer column filled with 1 g anhydrous sodium sulfate, 2 g 10% silver nitrate-impregnated silica gel, 4 g 3.3% water-deactivated silica gel and 1.5 g anhydrous sodium sulfate were selected as purification procedures. The chromatographic conditions were optimized to obtain the best enantiomeric separation. Complete baseline separation
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3

Vieira, Lucas C. C., Bianca T. Matsuo, Lorena S. R. Martelli, Mayara Gall, Marcio W. Paixão та Arlene G. Corrêa. "Asymmetric synthesis of new γ-butenolides via organocatalyzed epoxidation of chalcones". Organic & Biomolecular Chemistry 15, № 29 (2017): 6098–103. http://dx.doi.org/10.1039/c7ob00165g.

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4

Wzorek, Alicja, Magdalena Kwiatkowska, Mariusz Urbaniak, and Barbara Gawdzik. "PROCES SAMO-DYSPROPORCJONOWANIA ENANCJOMERÓW PODCZAS CHROMATOGRAFII KOLUMNOWEJ." Wiadomości Chemiczne 77, no. 5 (2023): 425–48. https://doi.org/10.53584/wiadchem.2023.05.2.

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The review is devoted to self-disproportionation of enantiomers (SDE) phenomenon which has been observed for many different classes of chiral organic compounds. The SDE phenomenon occurs when the fractionation of an enantioenriched sample due the application of a physicochemical process under achiral conditions results in the variation of the proportion of the enantiomers present across the fractions, though the overall composition in terms of the sample ee remains unchanged. The SDE process can be considered in terms of separating the excess enantiomer from the racemate. The basic terminology
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5

Bosits, Miklós Hunor, Emese Pálovics, János Madarász, and Elemér Fogassy. "New Discoveries in Enantiomeric Separation of Racemic Tofisopam." Journal of Chemistry 2019 (April 7, 2019): 1–10. http://dx.doi.org/10.1155/2019/4980792.

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Resolution process of tofisopam has been re-evaluated now based on our new investigations. Originally, it was carried out in the water-chloroform system, where the intermediate salt of high diastereomeric excess was described as (R)-TOF·(R,R)-DBTA·(H2O)3. Opposed to previous assumptions, we have actually found that a different solvate composition, (R)-TOF‐(R,R)-DBTA-CHCl3, forms with chloroform, in which molecules of CHCl3 are captured and held with different strengths. Moreover, resolution of TOF with (R,R)-DBTA is possible (and favourable) in water-free solvent and solvent mixture. However,
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6

Zheng, Ming. "(Invited) Purification of Enantiomeric Pairs of DNA-Wrapped Carbon Nanotubes and Their Use in Bilateral Chiral Sensing." ECS Meeting Abstracts MA2024-01, no. 8 (2024): 833. http://dx.doi.org/10.1149/ma2024-018833mtgabs.

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This presentation will focus on our recent progress in purifying enantiomeric pairs of DNA-wrapped carbon nanotubes (DNA-CNTs) via the aqueous two-phase extraction method. We will also discuss a potential application of enantiomeric pairs of DNA-CNTs in bilateral chiral sensing.
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7

Varga and Bagi. "Preparation of Enantiomerically Enriched P-Stereogenic Dialkyl-Arylphosphine Oxides via Coordination Mediated Optical Resolution." Symmetry 12, no. 2 (2020): 215. http://dx.doi.org/10.3390/sym12020215.

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Optical resolution of several dialkyl-arylphosphine oxides was elaborated using the Ca2+ salt of (−)-O,O’-dibenzoyl-(2R,3R)-tartaric acid as the resolving agent. The conditions of crystallization and purification of the enantiomerically enriched phosphine oxides were optimized. Ethyl-phenyl-propylphosphine oxide and butyl-methyl-phenylphosphine oxide were prepared with an enantiomeric excess higher than 93%, whereas, three other dialkyl-arylphosphine oxides were obtained with an enantiomeric excess of 37–85%. It was also found that the sterically demanding alkyl chains hinder the formation of
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8

Frishman, Einat, Moshe Shapiro, David Gerbasi, and Paul Brumer. "Enantiomeric purification of nonpolarized racemic mixtures using coherent light." Journal of Chemical Physics 119, no. 14 (2003): 7237–46. http://dx.doi.org/10.1063/1.1603732.

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9

Meyer, Elazar. "Optimization of Process for Enzymatic Resolution of Racemic Amines using Continuous Flow Bioreactor." Technium: Romanian Journal of Applied Sciences and Technology 20 (March 22, 2024): 56–79. http://dx.doi.org/10.47577/technium.v20i.10794.

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The optimization of enzymatic process for the resolution of chemically and pharmaceutically important racemic amines is described using a continuous flow bioreactor. Also described are the isolation and purification methods of the reaction products and the various parameters affecting the optimal reaction conditions for the enzymatic resolution to afford the products in high chemical purity and enantiomeric excess (ee) of over 90%.
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10

Gerbasi, David, Paul Brumer, Ioannis Thanopulos, Petr Král, and Moshe Shapiro. "Theory of the two step enantiomeric purification of 1,3 dimethylallene." Journal of Chemical Physics 120, no. 24 (2004): 11557–63. http://dx.doi.org/10.1063/1.1753552.

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11

Belardini, Alessandro, Emilija Petronijevic, Ramin Ghahri, et al. "Fluorescence Spectroscopy of Enantiomeric Amide Compounds Enforced by Chiral Light." Applied Sciences 11, no. 23 (2021): 11375. http://dx.doi.org/10.3390/app112311375.

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Chirality, the absence of mirror symmetry, governs behavior in most biologically important molecules, thus making the chiral recognition of great importance in the pharmaceutical and agrochemical industries, as well as medicine. Chiral molecules can be characterized by means of optical experiments based on chiro-optical excitation of molecules. Specifically, chiral absorptive materials differently absorb left- and right-circular polarized light, i.e., they possess circular dichroism (CD). Unfortunately, the natural CD of most molecules is very low and lies in the ultraviolet range. Fluorescenc
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12

Kőrösi, Márton, Csaba Varga, Péter Tóth, Noémi Buczkó, Erzsébet Varga, and Edit Székely. "Experimental Determination of a Chiral Ternary Solubility Diagram and Its Interpretation in Gas Antisolvent Fractionation." Molecules 28, no. 5 (2023): 2115. http://dx.doi.org/10.3390/molecules28052115.

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Although crystallization has been widely applied for the enantiomeric enrichment of non-racemates both in research and in industrial applications, the physical–chemical background of chiral crystallizations is not as frequently discussed. A guide for the experimental determination of such phase equilibrium information is lacking. In the current paper, the experimental investigation of chiral melting phase equilibria, chiral solubility phase diagrams and their application in atmospheric and supercritical carbon dioxide-assisted enantiomeric enrichment is described and compared. Benzylammonium m
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13

Zhang, Shi-Yuan, Cheng-Xiong Yang, Wei Shi, et al. "A Chiral Metal-Organic Material that Enables Enantiomeric Identification and Purification." Chem 3, no. 2 (2017): 281–89. http://dx.doi.org/10.1016/j.chempr.2017.07.004.

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14

Metcalf, James S., Sandra Anne Banack, Peter B. Wyatt, Peter B. Nunn та Paul A. Cox. "A Direct Analysis of β-N-methylamino-l-alanine Enantiomers and Isomers and Its Application to Cyanobacteria and Marine Mollusks". Toxins 15, № 11 (2023): 639. http://dx.doi.org/10.3390/toxins15110639.

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Of the wide variety of toxic compounds produced by cyanobacteria, the neurotoxic amino acid β-N-methylamino-l-alanine (BMAA) has attracted attention as a result of its association with chronic human neurodegenerative diseases such as ALS and Alzheimer’s. Consequently, specific detection methods are required to assess the presence of BMAA and its isomers in environmental and clinical materials, including cyanobacteria and mollusks. Although the separation of isomers such as β-amino-N-methylalanine (BAMA), N-(2-aminoethyl)glycine (AEG) and 2,4-diaminobutyric acid (DAB) from BMAA has been demonst
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15

Johansson, Henrik, Thomas Cailly, Alex Rojas Bie Thomsen, Hans Bräuner-Osborne, and Daniel Sejer Pedersen. "Synthesis of the calcilytic ligand NPS 2143." Beilstein Journal of Organic Chemistry 9 (July 9, 2013): 1383–87. http://dx.doi.org/10.3762/bjoc.9.154.

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(R)-3 (NPS 2143) is a negative allosteric modulator of the human calcium-sensing receptor (CaSR) and as such represents an important pharmacological tool compound for studying the CaSR. Herein, we disclose for the first time a complete experimental description, detailed characterisation and assessment of enantiomeric purity for (R)-3. An efficient, reproducible and scalable synthesis of (R)-3 that requires a minimum of chromatographic purification steps is presented. (R)-3 was obtained in excellent optical purity (er > 99:1) as demonstrated by chiral HPLC and the pharmacological profile for
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16

Chen, Alex M., Yaling Wang, and Robert M. Wenslow. "Purification of Partially Resolved Enantiomeric Mixtures with the Guidance of Ternary Phase Diagram." Organic Process Research & Development 12, no. 2 (2008): 271–81. http://dx.doi.org/10.1021/op7002387.

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17

Waśniowski, Paweł, Jolanta Czuczejko, Michał Chuchra, et al. "Automatic Production of [18F]F-DOPA Using the Raytest SynChrom R&D Module." Pharmaceuticals 16, no. 1 (2022): 10. http://dx.doi.org/10.3390/ph16010010.

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[18F]F-DOPA is widely used in PET diagnostics. Diseases diagnosed with this tracer are schizophrenia, Parkinson’s disease, gliomas, neuroendocrine tumors, pheochromocytomas, and pancreatic adenocarcinoma. It should be noted that the [18F]F-DOPA tracer has been known for over 30 years. However, the methods of radiosynthesis applied in the past did not allow its clinical use due to low efficiency and purity. Currently, in the market, one encounters different types of radiosynthesis using the fluorine 18F isotope and variants of the same method. The synthesis and its modifications were carried ou
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18

Thanopulos, Ioannis, Petr Král, and Moshe Shapiro. "Theory of a two-step enantiomeric purification of racemic mixtures by optical means: The D2S2 molecule." Journal of Chemical Physics 119, no. 10 (2003): 5105–16. http://dx.doi.org/10.1063/1.1597491.

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19

Zeng, Lu, Rongda Xu, Yinong Zhang, and Daniel B. Kassel. "Two-dimensional supercritical fluid chromatography/mass spectrometry for the enantiomeric analysis and purification of pharmaceutical samples." Journal of Chromatography A 1218, no. 20 (2011): 3080–88. http://dx.doi.org/10.1016/j.chroma.2011.03.041.

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20

Martens, Jürgen, and Ravi Bhushan. "Purification of Enantiomeric Mixtures in Enantioselective Synthesis: Overlooked Errors and Scientific Basis of Separation in Achiral Environment." Helvetica Chimica Acta 97, no. 2 (2014): 161–87. http://dx.doi.org/10.1002/hlca.201300392.

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21

Wzorek, Alicja, Karel Klika, Jianlin Han, Alexander Sorochinsky, Taizo Ono, and Vadim Soloshonok. "ENANTIOMER PURIFICATION THROUGH ACHIRAL CHROMATOGRAPHY: INTEGRATING SIMULATED MOVING BED AND SELF-DISPROPORTIONATION OF ENANTIOMERS." Ukrainian Chemistry Journal 91, no. 3 (2025): 34–48. https://doi.org/10.33609/2708-129x.91.3.2025.34-48.

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Enantiomer purification is a critical process in the pharmaceutical, agrochemical, and food industries, where chiral compounds often exhibit distinct biological activities. Traditional chiral chromatography is effective but costly due to the use of expensive chiral stationary phases. This review article highlights a recent breakthrough in enantiomer purification under entirely achiral conditions. Specifically, it focuses on the convergence of achiral simulated moving bed chromatography and the phenomenon of self-disproportionation of enantiomers (SDE). Experimental validation using scalemic me
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22

Singh, Ankita, PalakVarma .., Arpita Singh, et al. "Applications of Microbial Enzymes: The Need of an Hour." Indian Journal of Genetics and Molecular Research 12, no. 2 (2023): 19–32. http://dx.doi.org/10.21088/ijgmr.2319.4782.12223.3.

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A growing need for sustainable solutions is one of the primary drivers of the demand for industrial enzymes. One of the most significant and beneficial sources of many enzymes has been and still is the microbial world. Numerous industrial procedures, such as chemical synthesis used to create chemicals and pharmaceuticals, have a number of drawbacks: Lack of enantiomeric specificity for chiral synthesis, low pH, high pressure, high temperature, and low catalytic efficiency. Enzyme research and interest are still advancing, which helps industrial biocatalysis succeed even more. There should be a
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23

Cumbicus, Carolina, Omar Malagón, Nixon Cumbicus, and Gianluca Gilardoni. "The Leaf Essential Oil of Gynoxys buxifolia (Kunth) Cass. (Asteraceae): A Good Source of Furanoeremophilane and Bakkenolide A." Plants 12, no. 6 (2023): 1323. http://dx.doi.org/10.3390/plants12061323.

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The present study describes the chemical and enantiomeric composition of a new essential oil, distilled from the dry leaves of Gynoxys buxifolia (Kunth) Cass. The chemical analysis was conducted by GC-MS and GC-FID, on two orthogonal capillary columns. A total of 72 compounds were detected and quantified with at least one column, corresponding to about 85% by weight of the whole oil mass. Of the 72 components, 70 were identified by comparing the respective linear retention indices and mass spectra with data from the literature, whereas the two main constituents were identified by preparative p
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24

Rösener, Nadine S., Lothar Gremer, Elke Reinartz та ін. "A d-enantiomeric peptide interferes with heteroassociation of amyloid-β oligomers and prion protein". Journal of Biological Chemistry 293, № 41 (2018): 15748–64. http://dx.doi.org/10.1074/jbc.ra118.003116.

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Alzheimer's disease (AD) is a progressive neurodegenerative disorder that affects millions of people worldwide. One AD hallmark is the aggregation of β-amyloid (Aβ) into soluble oligomers and insoluble fibrils. Several studies have reported that oligomers rather than fibrils are the most toxic species in AD progression. Aβ oligomers bind with high affinity to membrane-associated prion protein (PrP), leading to toxic signaling across the cell membrane, which makes the Aβ–PrP interaction an attractive therapeutic target. Here, probing this interaction in more detail, we found that both full-leng
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25

Peters, Christin, and Rebecca Buller. "Linear enzyme cascade for the production of (–)-iso-isopulegol." Zeitschrift für Naturforschung C 74, no. 3-4 (2019): 63–70. http://dx.doi.org/10.1515/znc-2018-0146.

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Abstract Biocatalysis has developed enormously in the last decade and now offers solutions for the sustainable production of chiral and highly functionalised asset molecules. Products generated by enzymatic transformations are already being used in the food, feed, chemical, pharmaceutical and cosmetic industry, and the accessible compound panoply is expected to expand even further. In particular, the combination of stereo-selective enzymes in linear cascade reactions is an elegant strategy toward enantiomeric pure compounds, as it reduces the number of isolation and purification steps and avoi
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26

Gu, Xuyuan, John M. Ndungu, Wei Qiu та ін. "Large scale enantiomeric synthesis, purification, and characterization of ω-unsaturated amino acids via a Gly-Ni(II)-BPB-complex". Tetrahedron 60, № 37 (2004): 8233–43. http://dx.doi.org/10.1016/j.tet.2004.06.087.

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27

Martens, Juergen, and Ravi Bhushan. "ChemInform Abstract: Purification of Enantiomeric Mixtures in Enantioselective Synthesis: Overlooked Errors and Scientific Basis of Separation in Achiral Environment." ChemInform 45, no. 17 (2014): no. http://dx.doi.org/10.1002/chin.201417256.

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28

Inoue, Kousuke, Yoshihide Makino, and Nobuya Itoh. "Purification and Characterization of a Novel Alcohol Dehydrogenase from Leifsonia sp. Strain S749: a Promising Biocatalyst for an Asymmetric Hydrogen Transfer Bioreduction." Applied and Environmental Microbiology 71, no. 7 (2005): 3633–41. http://dx.doi.org/10.1128/aem.71.7.3633-3641.2005.

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ABSTRACT To find microorganisms that could reduce phenyl trifluoromethyl ketone (PTK) to (S)-1-phenyltrifluoroethanol [(S)-PTE], styrene-assimilating bacteria (ca. 900 strains) isolated from soil samples were screened. We found that Leifsonia sp. strain S749 was the most suitable strain for the conversion of PTK to (S)-PTE in the presence of 2-propanol as a hydrogen donor. The enzyme corresponding to the reaction was purified homogeneity, characterized and designated Leifsonia alcohol dehydrogenase (LSADH). The purified enzyme had a molecular weight of 110,000 and was composed of four identica
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29

López-Gómez, José Pablo, Peter Unger, Roland Schneider, and Joachim Venus. "From Upstream to Purification: Production of Lactic Acid from the Organic Fraction of Municipal Solid Waste." Waste and Biomass Valorization 11, no. 10 (2020): 5247–54. http://dx.doi.org/10.1007/s12649-020-00992-9.

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Abstract The implementation of an efficient and sustainable management of the organic fraction of municipal solid wastes (OFMSW) is a topic of intensive discussion in EU countries. Recently, the OFMSW has been investigated as a potential substrate for the production of lactic acid (LA) through fermentation. Nevertheless, none of the reports available in the literature covers all the stages of the conversion process. The present research article is a comprehensive study which includes the upstream, fermentation and downstream for the conversion of OFMSW into LA. Several batches of OFMSW were an
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30

Sheldon, R. A. "Cross-linked enzyme aggregates (CLEA®s): stable and recyclable biocatalysts." Biochemical Society Transactions 35, no. 6 (2007): 1583–87. http://dx.doi.org/10.1042/bst0351583.

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The key to obtaining an optimum performance of an enzyme is often a question of devising an effective method for its immobilization. In the present review, we describe a novel, versatile and effective methodology for enzyme immobilization as CLEAs (cross-linked enzyme aggregates). The method is exquisitely simple (involving precipitation of the enzyme from aqueous buffer followed by cross-linking of the resulting physical aggregates of enzyme molecules) and amenable to rapid optimization. We have shown it to be applicable to a wide variety of enzymes, including, in addition to a wide variety o
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31

Pennacchio, Angela, Biagio Pucci, Francesco Secundo, Francesco La Cara, Mosè Rossi, and Carlo A. Raia. "Purification and Characterization of a Novel Recombinant Highly Enantioselective Short-Chain NAD(H)-Dependent Alcohol Dehydrogenase from Thermus thermophilus." Applied and Environmental Microbiology 74, no. 13 (2008): 3949–58. http://dx.doi.org/10.1128/aem.00217-08.

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ABSTRACT The gene encoding a novel alcohol dehydrogenase (ADH) that belongs to the short-chain dehydrogenase/reductase (SDR) superfamily was identified in the extremely thermophilic, halotolerant gram-negative eubacterium Thermus thermophilus HB27. The T. thermophilus ADH gene (adh Tt) was heterologously overexpressed in Escherichia coli, and the protein (ADHTt) was purified to homogeneity and characterized. ADHTt is a tetrameric enzyme consisting of identical 26,961-Da subunits composed of 256 amino acids. The enzyme has remarkable thermophilicity and thermal stability, displaying activity at
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32

Pogorevc, Mateja, and Kurt Faber. "Purification and Characterization of an Inverting Stereo- and Enantioselective sec-Alkylsulfatase from the Gram-Positive Bacterium Rhodococcus ruber DSM 44541." Applied and Environmental Microbiology 69, no. 5 (2003): 2810–15. http://dx.doi.org/10.1128/aem.69.5.2810-2815.2003.

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ABSTRACT Whole cells of Rhodococcus ruber DSM 44541 were found to hydrolyze (±)-2-octyl sulfate in a stereo- and enantiospecific fashion. When growing on a complex medium, the cells produced two sec-alkylsulfatases and (at least) one prim-alkylsulfatase in the absence of an inducer, such as a sec-alkyl sulfate or a sec-alcohol. From the crude cell-free lysate, two proteins responsible for sulfate ester hydrolysis (designated RS1 and RS2) were separated from each other based on their different hydrophobicities and were subjected to further chromatographic purification. In contrast to sulfatase
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33

Faigl, Ferenc, Kálmán Simon, Antal Lopata, et al. "A combined DSC, X-ray diffraction, and molecular modelling study of chiral discrimination in the purification of enantiomeric mixtures of cis-permethrinic acid." J. Chem. Soc., Perkin Trans. 2, no. 1 (1990): 57–63. http://dx.doi.org/10.1039/p29900000057.

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34

Hu, Shaoqiang. "Copper (II) Ions Induced Self-Disproportionation of Enantiomers in Capillary Electrophoresis for the Quantification of Atenolol Enantiomers." Molecules 28, no. 15 (2023): 5908. http://dx.doi.org/10.3390/molecules28155908.

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Despite the fact that the self-disproportionation of enantiomers (SDE) has been found for several decades and has been widely used in crystallization, sublimation and chromatography for the purification or separation of nonracemic compounds, the phenomenon of SDE in capillary electrophoresis (CE) has never been reported up to now. Here, a new approach to separate enantiomers in CE based on SDE was demonstrated by introducing copper (II) ions into the separation media. The enantiomers of atenolol interact with copper ions to produce positively charged complexes with different electrophoretic mo
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35

Calvopiña, Karyna, Omar Malagón, Francesca Capetti, Barbara Sgorbini, Verónica Verdugo, and Gianluca Gilardoni. "A New Sesquiterpene Essential Oil from the Native Andean Species Jungia rugosa Less (Asteraceae): Chemical Analysis, Enantiomeric Evaluation, and Cholinergic Activity." Plants 10, no. 10 (2021): 2102. http://dx.doi.org/10.3390/plants10102102.

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As part of a project devoted to the phytochemical study of Ecuadorian biodiversity, new essential oils are systematically distilled and analysed. In the present work, Jungia rugosa Less (Asteraceae) has been selected and some wild specimens collected to investigate the volatile fraction. The essential oil, obtained from fresh leaves, was analysed for the first time in the present study. The chemical composition was determined by gas chromatography, coupled to mass spectrometry (GC-MS) for qualitative analysis, and to flame ionization detector (GC-FID) for quantitation. The calculation of relat
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36

Aly, Ashraf A., Stefan Bräse, Alaa A. Hassan, Nasr K. Mohamed, Lamiaa E. Abd El-Haleem, and Martin Nieger. "Synthesis of New Planar-Chiral Linked [2.2]Paracyclophanes-N-([2.2]-Paracyclophanylcarbamoyl)-4-([2.2]Paracyclophanylcarboxamide, [2.2]Paracyclophanyl-Substituted Triazolthiones and -Substituted Oxadiazoles." Molecules 25, no. 15 (2020): 3315. http://dx.doi.org/10.3390/molecules25153315.

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The manuscript describes the synthesis of new racemic and chiral linked paracyclophane assigned as N-5-(1,4(1,4)-dibenzenacyclohexaphane-12-yl)carbamoyl)-5’-(1,4(1,4)-dibenzenacyclohexaphane-12-yl)carboxamide. The procedure depends upon the reaction of 5-(1,4(1,4)-dibenzenacyclohexaphane-12-yl)hydrazide with 5-(1,4(1,4)-dibenzenacyclohexaphane-12-yl)isocyanate. To prepare the homochiral linked paracyclophane of a compound, the enantioselectivity of 5-(1,4(1,4)-dibenzenacyclohexaphane-12-yl)carbaldehyde (enantiomeric purity 60% ee), was oxidized to the corresponding acid, which on chlorination,
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37

Pietrusiewicz, K. Michał, Mariusz Borkowski, Dorota Strzelecka, et al. "A General Phenomenon of Spontaneous Amplification of Optical Purity under Achiral Chromatographic Conditions." Symmetry 11, no. 5 (2019): 680. http://dx.doi.org/10.3390/sym11050680.

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This work explores the behavior of chiral compound mixtures enriched in one of the enantiomers whilst a typical chromatography on the achiral stationary phase is employed. The influence of several factors, such as the eluent composition, ratio of the compound to the stationary phase, and the initial enatiomeric purity of the compound used on the distribution of the enantiomers in the collected chromatographic fraction, was studied. The obtained results indicate that the phenomenon of Self Disproportionation of Enantiomer (SDE) occurred in all cases, and some of the collected fractions got high
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38

Nolte, Johannes Christoph, Marc Schürmann, Catherine-Louise Schepers, Elvira Vogel, Jan Hendrik Wübbeler, and Alexander Steinbüchel. "Novel Characteristics of Succinate Coenzyme A (Succinate-CoA) Ligases: Conversion of Malate to Malyl-CoA and CoA-Thioester Formation of Succinate AnaloguesIn Vitro." Applied and Environmental Microbiology 80, no. 1 (2013): 166–76. http://dx.doi.org/10.1128/aem.03075-13.

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ABSTRACTThree succinate coenzyme A (succinate-CoA) ligases (SucCD) fromEscherichia coli,Advenella mimigardefordensisDPN7T, andAlcanivorax borkumensisSK2 were characterized regarding their substrate specificity concerning succinate analogues. Previous studies had suggested that SucCD enzymes might be promiscuous toward succinate analogues, such as itaconate and 3-sulfinopropionate (3SP). The latter is an intermediate of the degradation pathway of 3,3′-dithiodipropionate (DTDP), a precursor for the biotechnical production of polythioesters (PTEs) in bacteria. ThesucCDgenes were expressed inE. co
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39

Nishihara, M., and Y. Koga. "Purification and Properties of sn-Glycerol-1 -Phosphate Dehydrogenase from Methanobacterium thermoautotrophicum: Characterization of the Biosynthetic Enzyme for the Enantiomeric Glycerophosphate Backbone of Ether Polar Lipids of Archaea." Journal of Biochemistry 122, no. 3 (1997): 572–76. http://dx.doi.org/10.1093/oxfordjournals.jbchem.a021791.

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40

Ueki, Hisanori, Manabu Yasumoto, and Vadim A. Soloshonok. "Rational application of self-disproportionation of enantiomers via sublimation—a novel methodological dimension for enantiomeric purifications." Tetrahedron: Asymmetry 21, no. 11-12 (2010): 1396–400. http://dx.doi.org/10.1016/j.tetasy.2010.04.040.

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41

Souness, J. E., and L. C. Scott. "Stereospecificity of rolipram actions on eosinophil cyclic AMP-specific phosphodiesterase." Biochemical Journal 291, no. 2 (1993): 389–95. http://dx.doi.org/10.1042/bj2910389.

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The stereospecificity of rolipram inhibition of particulate cyclic AMP-specific phosphodiesterase (PDE IV) from guinea-pig eosinophils has been investigated. (-)-Rolipram (IC50 = 0.22 +/- 0.08 microM) was 2.5-fold more potent than (+)-rolipram (IC50 = 0.58 +/- 0.05 microM) in inhibiting membrane-bound PDE IV. Solubilization of PDE IV with deoxycholate (0.5%) and NaCl (100 mM) increased rolipram stereospecificity [IC50 (-)-rolipram = 0.020 +/- 0.002 microM; IC50 (+)-rolipram = 0.33 +/- 0.07 microM]. Partial purification of this solubilized PDE IV by DEAE-trisacryl anion-exchange chromatography
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42

Shiau, Lie-Ding, Keng-Fu Liu, and Pin-Hao Huang. "Purification of hydrobenzoin enantiomers by stripping crystallization." Journal of the Taiwan Institute of Chemical Engineers 44, no. 5 (2013): 707–12. http://dx.doi.org/10.1016/j.jtice.2013.01.020.

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43

Gee, N. S., C. I. Ragan, K. J. Watling, et al. "The purification and properties of myo-inositol monophosphatase from bovine brain." Biochemical Journal 249, no. 3 (1988): 883–89. http://dx.doi.org/10.1042/bj2490883.

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1. An inositol monophosphatase was purified to homogeneity from bovine brain. 2. The enzyme is a dimer of subunit Mr 29,000. 3. The enzyme hydrolyses both enantiomers of myo-inositol 1-phosphate and both enantiomers of myo-inositol 4-phosphate, but has no activity towards inositol bisphosphates, inositol trisphosphates or inositol 1,3,4,5-tetrakisphosphate. 4. Several non-inositol-containing monophosphates are also substrates. 5. The enzyme requires Mg2+ for activity, and Zn2+ supports activity to a small extent. 6. Other bivalent cations (including Zn2+) are inhibitors, competitive with Mg2+.
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44

Izatt, Neil E., Ronald L. Bruening, Krzysztof E. Krakowiak, Reed M. Izatt, and Jerald S. Bradshaw. "ChemInform Abstract: Nonchromatographic Solid-Phase Purification of Enantiomers." ChemInform 32, no. 29 (2010): no. http://dx.doi.org/10.1002/chin.200129267.

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45

Zhou, Shengde, T. B. Causey, A. Hasona, K. T. Shanmugam, and L. O. Ingram. "Production of Optically Pure d-Lactic Acid in Mineral Salts Medium by Metabolically Engineered Escherichia coli W3110." Applied and Environmental Microbiology 69, no. 1 (2003): 399–407. http://dx.doi.org/10.1128/aem.69.1.399-407.2003.

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ABSTRACT The resistance of polylactide to biodegradation and the physical properties of this polymer can be controlled by adjusting the ratio of l-lactic acid to d-lactic acid. Although the largest demand is for the l enantiomer, substantial amounts of both enantiomers are required for bioplastics. We constructed derivatives of Escherichia coli W3110 (prototrophic) as new biocatalysts for the production of d-lactic acid. These strains (SZ40, SZ58, and SZ63) require only mineral salts as nutrients and lack all plasmids and antibiotic resistance genes used during construction. d-Lactic acid prod
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46

Metzger, Tzuriel S., Yair Tokatly, Eytan Avigad, Shira Yochelis, and Yossi Paltiel. "Selective enantiomer purification using magnetic oriented interacting microparticles." Separation and Purification Technology 239 (May 2020): 116501. http://dx.doi.org/10.1016/j.seppur.2020.116501.

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47

Gu, Binbin, Anwei Hou, and Jeroen S. Dickschat. "The stereochemical course of 2-methylisoborneol biosynthesis." Beilstein Journal of Organic Chemistry 18 (July 8, 2022): 818–24. http://dx.doi.org/10.3762/bjoc.18.82.

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Both enantiomers of 2-methyllinalyl diphosphate (2-Me-LPP) were synthesized enantioselectively using Sharpless epoxidation as a key step and purification of enantiomerically enriched intermediates through HPLC separation on a chiral stationary phase. Their enzymatic conversion with 2-methylisoborneol synthase (2MIBS) demonstrates that (R)-2-Me-LPP is the on-pathway intermediate, while a minor formation of 2-methylisoborneol from (S)-2-Me-LPP may be explained by isomerization to 2-Me-GPP and then to (R)-2-Me-LPP.
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48

Doumani, Jacques, Rui Xu, Minhan Lou, et al. "(Invited) Wafer-Scale Probing of Natural and Synthetic Chirality in Carbon Nanotubes." ECS Meeting Abstracts MA2024-01, no. 9 (2024): 907. http://dx.doi.org/10.1149/ma2024-019907mtgabs.

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Harnessing chirality can advance diverse technologies, encompassing displays, quantum light sources, secured communication, and biosensing. We have investigated chirality-induced processes in carbon nanotube (CNT) ensembles, based on both natural and synthetic chirality, on macroscopic scales. Firstly, through enantiomer purification [1] combined with nanotube alignment [2], we demonstrated second harmonic generation in an aligned film of (6,5)+ single enantiomer-enriched CNTs. Enantiomer purification using mixed-surfactant gel chromatography and CNT alignment through controlled vacuum filtrat
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49

Huskova, Nadiia. "OPTIMIZING ENANTIOMER SEPARATION PROCESSES: A MATHEMATICAL MODELING APPROACH IN CONTINUOUS FLUIDIZED BEDS." Problems of Modeling and Design Automatization 1, no. 21 (2025): 20–23. https://doi.org/10.31474/2074-7888-2025-1-21-20-23.

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This study centers on the optimization of a purification process aimed at separating enantiomers, specifically focusing on the extraction of asparagine monohydrate from its racemic mixture. The ability to efficiently separate enantiomers is critical in various industries, particularly pharmaceuticals, where the purity of compounds can significantly influence the effectiveness and safety of drugs. A validated mathematical model based on population balance equations serves as the foundation for this research. By employing numerical optimization techniques, this work identifies a set of operation
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50

Shiau, Lie-Ding, Keng-Fu Liu, and Yu-Chao Hsu. "Chiral purification of S-ibuprofen from ibuprofen enantiomers by stripping crystallization." Chemical Engineering Research and Design 117 (January 2017): 301–8. http://dx.doi.org/10.1016/j.cherd.2016.10.019.

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