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27 Results Found

  • Review
  • Open Access
38 Citations
9,107 Views
32 Pages

Carbon nanotubes (CNTs) possess unique mechanical, physical, electrical and absorbability properties coupled with their nanometer dimensional scale that renders them extremely valuable for applications in many fields including nanotechnology and chro...

  • Review
  • Open Access
25 Citations
8,126 Views
29 Pages

Comprehensive Review on Chiral Stationary Phases in Single-Column Simultaneous Chiral–Achiral HPLC Separation Methods

  • Lajos Attila Papp,
  • Zoltán István Szabó,
  • Gabriel Hancu,
  • Lénárd Farczádi and
  • Eleonora Mircia

18 March 2024

This comprehensive review explores the utilization of chiral stationary phases (CSPs) in the context of single-column simultaneous chiral–achiral high-performance liquid chromatography (HPLC) separation methods. While CSPs have traditionally be...

  • Article
  • Open Access
2 Citations
4,509 Views
21 Pages

The Effect of the Stationary Phase on Resolution in the HPLC-Based Separation of Racemic Mixtures Using Vancomycin as a Chiral Selector: A Case Study with Profen Nonsteroidal Anti-Inflammatory Drugs

  • Dehbiya Gherdaoui,
  • Madiha Melha Yahoum,
  • Selma Toumi,
  • Hichem Tahraoui,
  • Fatma Bouazza,
  • Sonia Lefnaoui,
  • Abdelhamid Zeghdaoui,
  • Abdeltif Amrane,
  • Bassem Jaouadi and
  • Jie Zhang

4 December 2023

Chiral resolution is a technique of choice, making it possible to obtain asymmetric and enantiomerically pure compounds from a racemic mixture. This study investigated the behavior of vancomycin when used as a chiral additive in high-performance liqu...

  • Article
  • Open Access
7 Citations
4,025 Views
20 Pages

A General Phenomenon of Spontaneous Amplification of Optical Purity under Achiral Chromatographic Conditions

  • K. Michał Pietrusiewicz,
  • Mariusz Borkowski,
  • Dorota Strzelecka,
  • Katarzyna Kielar,
  • Wioleta Kicińska,
  • Sergei Karevych,
  • Radomir Jasiński and
  • Oleg M. Demchuk

17 May 2019

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...

  • Article
  • Open Access
6 Citations
3,625 Views
11 Pages

Chiroptical Performances in Self-Assembled Hierarchical Nanosegregated Chiral Intermediate Phases Composed of Two Different Achiral Bent-Core Molecules

  • Jae-Jin Lee,
  • Sangsub Kim,
  • Hiroya Nishikawa,
  • Yoichi Takanishi,
  • Hiroshi Iwayama,
  • Changsoon Kim,
  • Suk-Won Choi and
  • Fumito Araoka

23 November 2022

In this paper, chiral intermediate phases composed of two achiral molecules are fabricated by utilizing nanophase separation and molecular hierarchical self-organization. An achiral bent-core guest molecule, exhibiting a calamitic nematic and a dark...

  • Communication
  • Open Access
4 Citations
2,877 Views
6 Pages

19 October 2020

Although several methods exist for the synthesis of circularly polarized luminescent (CPL) materials, the methods are extremely complex and tedious. In recent years, the chiral host-achiral luminescent guest method and the achiral host-achiral lumine...

  • Article
  • Open Access
14 Citations
4,515 Views
11 Pages

30 November 2021

The increased use and applicability of Cannabis and Cannabis-derived products has skyrocketed over the last 5 years. With more and more governing bodies moving toward medical and recreational legalization, the need for robust and reliable analytical...

  • Article
  • Open Access
10 Citations
2,618 Views
13 Pages

16 August 2022

Bile salts are a category of natural chiral surfactants which have ever been used as the surfactant and chiral selector for the separation of many chiral compounds by micellar electrokinetic chromatography (MEKC). In our previous works, the applicati...

  • Article
  • Open Access
12 Citations
4,154 Views
14 Pages

Multiple Heart-Cutting Two-Dimensional HPLC-UV Achiral–Chiral Analysis of Branched-Chain Amino Acids in Food Supplements under Environmentally Friendly Conditions

  • Ina Varfaj,
  • Simone Moretti,
  • Federica Ianni,
  • Carolina Barola,
  • Ghaid W. A. Abualzulof,
  • Andrea Carotti,
  • Lina Cossignani,
  • Roberta Galarini and
  • Roccaldo Sardella

A multiple heart-cutting (mLC-LC) two-dimensional HPLC-UV achiral–chiral method for the direct analysis of branched-chain amino acids (BCAAs) in food supplements under environmentally friendly conditions was developed to cope with the very well...

  • Article
  • Open Access
4 Citations
2,508 Views
12 Pages

Synthesis and Vibrational Circular Dichroism Analysis of N-Heterocyclic Carbene Precursors Containing Remote Chirality Centers

  • Zita Szabó,
  • Attila Paczal,
  • Tibor Kovács,
  • Attila Mándi,
  • Andras Kotschy and
  • Tibor Kurtán

VCD analysis of 16 diastereomeric pairs of NHC precursors containing two isolated chirality centers and different substitution patterns identified VCD transitions characteristic of the chirality center in the imidazolium ring or in the side chain, wh...

  • Article
  • Open Access
7 Citations
2,472 Views
15 Pages

13 February 2021

In this study, a complex consisting of 2-hydroxypropyl-β-cyclodextrin and 5,10,15,20-tetrakis (4-hydroxyphenyl) porphyrin, (named dual chiral-achiral selector complex) was used for the determination of two novel potential anticancer agents of (I) and...

  • Review
  • Open Access
15 Citations
5,114 Views
20 Pages

Hydrophilic interaction liquid chromatography (HILIC) today is a well-known and largely applied technique to analyse polar compounds such as pharmaceuticals, metabolites, proteins, peptides, amino acids, oligonucleotides, and carbohydrates. Due to th...

  • Article
  • Open Access
6 Citations
3,262 Views
14 Pages

2,12-Diaza[6]helicene: An Efficient Non-Conventional Stereogenic Scaffold for Enantioselective Electrochemical Interphases

  • Francesca Fontana,
  • Benedetta Bertolotti,
  • Sara Grecchi,
  • Patrizia Romana Mussini,
  • Laura Micheli,
  • Roberto Cirilli,
  • Matteo Tommasini and
  • Simona Rizzo

The new configurationally stable, unsymmetrical 2,12-diaza[6]helicene was synthesized as a racemate and the enantiomers were separated in an enantiopure state by semi-preparative HPLC on chiral stationary phase. Under selected alkylation conditions i...

  • Communication
  • Open Access
3 Citations
2,538 Views
7 Pages

Control of the Induced Handedness of Helical Nanofilaments Employing Cholesteric Liquid Crystal Fields

  • Ju-Yong Kim,
  • Jae-Jin Lee,
  • Jun-Sung Park,
  • Yong-Jun Choi and
  • Suk-Won Choi

6 October 2021

In this paper, a simple and powerful method to control the induced handedness of helical nanofilaments (HNFs) is presented. The nanofilaments are formed by achiral bent-core liquid crystal molecules employing a cholesteric liquid crystal field obtain...

  • Article
  • Open Access
12 Citations
3,218 Views
13 Pages

Helicity: A Non-Conventional Stereogenic Element for Designing Inherently Chiral Ionic Liquids for Electrochemical Enantiodifferentiation

  • Francesca Fontana,
  • Greta Carminati,
  • Benedetta Bertolotti,
  • Patrizia Romana Mussini,
  • Serena Arnaboldi,
  • Sara Grecchi,
  • Roberto Cirilli,
  • Laura Micheli and
  • Simona Rizzo

9 January 2021

Configurationally stable 5-aza[6]helicene (1) was envisaged as a promising scaffold for non-conventional ionic liquids (IL)s. It was prepared, purified, and separated into enantiomers by preparative HPLC on a chiral stationary phase. Enantiomerically...

  • Article
  • Open Access
8 Citations
3,153 Views
13 Pages

Porous Organic Cage-Embedded C10-Modified Silica as HPLC Stationary Phase and Its Multiple Separation Functions

  • Litao Wang,
  • Siqi Han,
  • Haiyang Yu,
  • Qinghua Yu,
  • Dong Pei,
  • Wenjing Lv,
  • Jiasheng Wang,
  • Xingyu Li,
  • Ruifang Ding and
  • Mei Lv

14 December 2022

Reduced imine cage (RCC3) was covalently bonded to the surface of silica spheres, and then the secondary amine group of the molecular cage was embedded in non-polar C10 for modification to prepare a novel RCC3-C10@silica HPLC stationary phase with mu...

  • Article
  • Open Access
16 Citations
8,390 Views
23 Pages

14 June 2012

We report a new method for the preparation of chiral 2-aryl-2-fluoropropanoic acids, including 2-fluoroibuprofen, a fluorinated analogue of non-steroidal anti-inflammatory drugs (NSAIDs), by the kinetic resolution of racemic 2-aryl-2-fluoropropanoic...

  • Review
  • Open Access
22 Citations
6,294 Views
21 Pages

27 August 2020

Because of its tunable textural properties and chirality feature, chiral mesoporous silica (CMS) gained significant consideration in many fields and has been developed rapidly in recent years. In this review, we provide an overview of synthesis strat...

  • Article
  • Open Access
5 Citations
2,603 Views
15 Pages

Elucidating Chiral Resolution of Aromatic Amino Acids Using Glycopeptide Selectors: A Combined Molecular Docking and Chromatographic Study

  • Dehbiya Gherdaoui,
  • Madiha Melha Yahoum,
  • Selma Toumi,
  • Sabrina Lekmine,
  • Sonia Lefnaoui,
  • Ouided Benslama,
  • Rachida Bouallouche,
  • Hichem Tahraoui,
  • Mohammad Shamsul Ola and
  • Abdeltif Amrane
  • + 1 author

22 August 2024

An asymmetric synthesis is a favorable approach for obtaining enantiomerically pure substances, but racemic resolution remains an efficient strategy. This study aims to elucidate the chiral resolution of aromatic amino acids and their elution order u...

  • Communication
  • Open Access
3 Citations
1,760 Views
9 Pages

11 July 2022

In this paper, a binary mixture system consisting of an achiral bent-core molecule and a bent-core base main-chain polymer is described. The mixture exhibits an intriguing nanosegregated phase generated by the phase separation of the helical nanofila...

  • Review
  • Open Access
2 Citations
4,126 Views
23 Pages

Economic Separations of Organic Acidic or Basic Enantiomeric Mixtures—A Protocol Suggestion

  • Emese Pálovics,
  • János Madarász,
  • György Pokol,
  • Elemér Fogassy and
  • Dorottya Fruzsina Bánhegyi

In this review, we aim to present new concepts for the revisited separation of enantiomers from racemic compounds and a protocol worth to be followed in designing the preparation of pure enantiomers. We have taken into account not only the influence...

  • Article
  • Open Access
10 Citations
5,790 Views
12 Pages

24 September 2019

The natural compound Genkwanin (systematic name: 5-hydroxy-2-(4-hydroxyphenyl)-7-methoxychromen-4-one) C16H12O5 (1) is a non-glycosylated flavonoid isolated from Callicarpa americana. Microcrystals of Genkwanin were prepared by slow evaporation of a...

  • Hypothesis
  • Open Access
9 Citations
3,625 Views
23 Pages

10 December 2020

The peptides/proteins of all living beings on our planet are mostly made up of 19 L-amino acids and glycine, an achiral amino acid. Arising from endogenous and exogenous sources, the seas of the prebiotic Earth could have contained a huge diversity o...

  • Article
  • Open Access
7 Citations
3,000 Views
19 Pages

19 August 2022

Enantioseparation of the newly synthesized series of novel quinoline-2(1H)-one epoxide structures rac-6a–c and rac-8a–c, named marinoepoxides, is described. Marinoepoxide rac-6a, the key intermediate in the total synthesis of natural prod...

  • Review
  • Open Access
6 Citations
15,208 Views
43 Pages

The Multifaceted Health Benefits of Broccoli—A Review of Glucosinolates, Phenolics and Antimicrobial Peptides

  • Celia María Curieses Andrés,
  • José Manuel Pérez de la Lastra,
  • Elena Bustamante Munguira,
  • Celia Andrés Juan and
  • Eduardo Pérez-Lebeña

Broccoli, a highly valued Brassica vegetable, is renowned for its rich content of bioactive substances, including glucosinolates, phenolic compounds, vitamins, and essential minerals. Glucosinolates (GSLs), secondary plant metabolites, are particular...

  • Review
  • Open Access
53 Citations
7,171 Views
27 Pages

Liquid Crystal Dimers and Smectic Phases from the Intercalated to the Twist-Bend

  • Corrie T. Imrie,
  • Rebecca Walker,
  • John M. D. Storey,
  • Ewa Gorecka and
  • Damian Pociecha

2 September 2022

In this review we consider the relationships between molecular structure and the tendency of liquid crystal dimers to exhibit smectic phases, and show how our application of these led to the recent discovery of the twist-bend, heliconical smectic pha...

  • Hypothesis
  • Open Access
13 Citations
4,243 Views
16 Pages

Symmetry Breaking of Phospholipids

  • Michele Fiore and
  • René Buchet

10 September 2020

Either stereo reactants or stereo catalysis from achiral or chiral molecules are a prerequisite to obtain pure enantiomeric lipid derivatives. We reviewed a few plausibly organic syntheses of phospholipids under prebiotic conditions with special atte...