Related Experiment Video
Updated: May 12, 2026
11:09
Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline
Published on: January 5, 2017
An expanded cellular automata model for enantiomer separations using a β-cyclodextrin stationary phase.
Darren DeSoi1, Lemont B Kier, Chao-Kun Cheng
1Virginia Commonwealth University, School of Pharmacy, Department of Pharmaceutics, Richmond, VA 23298-0533, USA. desoidj@mymail.vcu.edu
Journal of Chromatography. A
|April 17, 2013
Summary
Cellular automata modeling now predicts enantiomer separation in High-Performance Liquid Chromatography (HPLC). This new approach accurately forecasts chromatographic outcomes for various chiral compounds.
Area of Science:
- Analytical Chemistry
- Computational Chemistry
- Chemical Engineering
Background:
- Enantiomer separation is crucial in pharmaceuticals and chemical industries.
- Previous cellular automata (CA) models accurately predicted enantiomer-β-cyclodextrin binding.
- CA modeling has not been applied to chromatographic scale enantiomer separation.
Purpose of the Study:
- To expand cellular automata (CA) modeling to a chromatographic scale.
- To transform CA model output into High-Performance Liquid Chromatography (HPLC) chromatograms.
- To validate the CA model's predictive accuracy for enantiomer separation under various conditions.
Main Methods:
- Development of a CA model on a chromatographic scale grid environment.
- Simulation of enantiomer separation for mandelic acid, brompheniramine, and cyclohexylphenylglycolic acid (CHPGA).
- Analysis of model predictions against published experimental data for selectivity, resolution, retention time, temperature, and mobile phase pH effects.
Main Results:
- The CA model accurately predicted the lack of selectivity for mandelic enantiomers (1.01 modeled vs. 1.05 published).
- The model accurately predicted the separation of brompheniramine enantiomers (1.12 modeled vs. 1.13 published).
- Accurate predictions of selectivity and resolution for CHPGA enantiomers across varying temperatures and mobile phase pH were achieved. Modeled injection volume changes aligned with experimental observations.
Conclusions:
- Cellular automata (CA) modeling is a viable tool for predicting chromatographic enantiomer separation.
- The developed CA model accurately forecasts HPLC chromatograms and separation parameters.
- This modeling approach can reduce experimental effort in chiral chromatography method development.
More Related Videos
11:44Cellular Membrane Affinity Chromatography Columns to Identify Specialized Plant Metabolites Interacting with Immobilized Tropomyosin Kinase Receptor B
Published on: January 19, 2022
09:42Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
Published on: January 16, 2016
Related Concept Videos
02:33Stereoisomerism of Cyclic Compounds
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
01:08Size-Exclusion Chromatography
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
Silica particles offer advantages such as rigidity,...
02:05Prochirality
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
02:30Racemic Mixtures and the Resolution of Enantiomers
A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit different...
02:24Properties of Enantiomers and Optical Activity
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
01:17Thermal Electrocyclic Reactions: Stereochemistry
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.