Chirality in Nature
Prochirality
Chirality
Properties of Enantiomers and Optical Activity
Chirality at Nitrogen, Phosphorus, and Sulfur
Racemic Mixtures and the Resolution of Enantiomers
You might also read
Articles linked to this work by shared authors, journal, and citation graph.
Updated: Feb 26, 2026

Reliable Mechanochemistry: Protocols for Reproducible Outcomes of Neat and Liquid Assisted Ball-mill Grinding Experiments
Published on: January 23, 2018
Hiroyasu Katsuno1, Makio Uwaha2
1Department of Physical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
This study explores how chiral impurities affect the process of chiral amplification during Viedma ripening. The researchers propose that chiral impurities can shift the unstable fixed point of the system from the racemic point, leading to linear amplification of enantiomeric excess. The model suggests that the amplification behavior is described by a second-order differential equation. The study also indicates that chiral impurities may cause oscillatory decay in enantiomeric excess. The findings highlight the importance of considering chiral impurities in models of chiral amplification.
Area of Science:
Background:
Chiral impurities can influence the behavior of enantiomerically pure substances during crystallization. Prior research has shown that chiral molecules can form crystals with distinct handedness. However, the role of impurities in modifying chiral amplification remains unclear. This gap motivated the exploration of how chiral impurities might alter the dynamics of chiral amplification. Existing models focus on idealized systems without impurities. No prior work had resolved the impact of chiral impurities on the rate of enantiomeric excess amplification. This uncertainty drove the need for a model that incorporates chiral impurities. The study aimed to bridge this knowledge gap by examining the effect of chiral impurities on Viedma ripening. The research sought to determine whether chiral impurities could shift the equilibrium point of chiral amplification. By addressing this question, the study contributes to the broader understanding of chiral amplification mechanisms.
Purpose Of The Study:
The study aimed to investigate how chiral impurities influence the process of chiral amplification during Viedma ripening. The specific problem addressed is the role of chiral impurities in altering the growth and dissolution dynamics of chiral crystals. The motivation stems from the need to understand how small concentrations of chiral impurities can shift the racemic point. The researchers propose that chiral impurities may modify the amplification behavior of enantiomeric excess. The study focuses on identifying the mathematical relationship governing this process. The goal is to determine whether chiral impurities can cause a shift in the unstable fixed point of the system. The researchers also aim to explore the possibility of oscillatory behavior in enantiomeric excess. By analyzing these effects, the study provides insights into the mechanisms of chiral amplification.
Main Methods:
The researchers employed a mathematical model to simulate the effect of chiral impurities on Viedma ripening. The model incorporates a second-order differential equation to describe the time evolution of enantiomeric excess. The approach involves analyzing the growth and dissolution rates of chiral crystals in the presence of impurities. The model assumes that chiral impurities affect the growth rate of monomers. The researchers propose that the amplification of enantiomeric excess is governed by the differential equation. The model includes parameters for the growth rate and the effect of chiral impurities. The analysis focuses on how the unstable fixed point shifts from the racemic point. The researchers also examine the possibility of oscillatory decay in enantiomeric excess.
Main Results:
The study found that chiral impurities significantly influence the amplification of enantiomeric excess. The model shows that the time evolution of enantiomeric excess is described by a second-order differential equation. The presence of chiral impurities shifts the unstable fixed point from the racemic point. This shift leads to a linear amplification of enantiomeric excess observed experimentally. The analysis also suggests a possibility of oscillatory decay in enantiomeric excess. The researchers propose that the amplification behavior is affected by the growth rate of monomers. The model predicts that smaller growth rates caused by chiral impurities accelerate amplification. The results indicate that chiral impurities can modify the dynamics of chiral amplification.
Conclusions:
The authors suggest that chiral impurities can shift the unstable fixed point of the system from the racemic point. This shift leads to the linear amplification of enantiomeric excess observed in experiments. The study proposes that the amplification behavior is governed by a second-order differential equation. The researchers suggest that the growth rate of monomers is affected by chiral impurities. The analysis indicates that chiral impurities may cause oscillatory decay in enantiomeric excess. The study highlights the importance of considering chiral impurities in models of chiral amplification. The authors propose that the mathematical model provides a framework for understanding the effect of chiral impurities. The findings suggest that chiral impurities can influence the dynamics of Viedma ripening.
The researchers propose that chiral impurities shift the unstable fixed point from the racemic point, leading to linear amplification of enantiomeric excess.
The model uses a second-order differential equation to describe the time evolution of enantiomeric excess in the presence of chiral impurities.
The growth rate of monomers is affected by chiral impurities, which in turn influences the amplification of enantiomeric excess.
The unstable fixed point determines the amplification behavior of enantiomeric excess and is shifted by chiral impurities.
The model suggests that chiral impurities may lead to oscillatory decay in enantiomeric excess, indicating complex dynamics in the system.
The study suggests that chiral impurities can significantly influence the dynamics of chiral amplification during Viedma ripening.