Why chirality has to be built into a molecular representation before any model can learn it Episode 1 of 5 Summary Two enantiomers can differ by an order of magnitude in potency, yet to most molecular machine learning models they are the same molecule. This is not a data problem that more training examples will …
Episode 1: Teaching Machines Molecular Handedness Read More »
How chiral methods and isolated standards are justified in a dossier, and a calibrated view of the future The regulatory position on stereochemical purity Regulators have treated stereochemistry as a quality and development issue for decades, and the core position has been stable even as the vocabulary evolved. FDA’s 1992 stereoisomer guidance requires that the …
Episode 5: Defending the Method: Regulatory Expectations and Where the Field Is Heading Read More »
“Turning an analytical separation into an isolated, characterised, defensible impurity standard” Why isolate a chiral impurity at all Analytical scientists ask for isolated chiral impurities when a chromatogram is no longer enough. The reasons are concrete: structural elucidation of an unknown peak, preparation of a reference standard, response-factor determination, qualification under ICH impurity expectations, forced-degradation …
Episode 4: From Peak to Standard: Preparative Isolation of Chiral Impurities Read More »
What modern chiral separation science can do now, and where the honest limits still lie The present technology landscape The most useful framing of the current landscape is that it is no longer sensible to ask, in the abstract, whether chiral HPLC or chiral SFC is “the best” approach. Modern laboratories operate with both, or …
Episode 3: State of the Art: Selectors, SFC, Speed, and Sensible Automation Read More »
From a structural diagnosis of the analyte to a defendable, robust, lifecycle-ready method Start with the molecule, not the column catalogue A credible chiral method does not begin with random column screening. It begins with a short structural diagnosis of the analyte and the likely impurity set. The pKa values indicate whether the analyte is …
Episode 2: Developing a Chiral HPLC Method: A Structure-Led Workflow Read More »
The pharmaceutical meaning of chirality, the real impurity space, and where chiral HPLC fits The pharmaceutical meaning of chirality Chirality matters in drug development for a simple reason. Biological systems are chiral, so the body does not experience two stereoisomers as the same molecule. FDA stated this explicitly in its landmark 1992 stereoisomer guidance, noting …
Episode 1: Why Chirality Still Matters: Stereochemistry as a Critical Quality Attribute Read More »
Introduction Chirality has already transformed how agrochemicals are designed, evaluated, and applied. From the early reliance on racemic formulations to today’s enantiopure products such as metalaxyl-M, the trajectory shows a clear shift toward stereochemistry as a cornerstone of innovation. The future of chiral agrochemistry lies at the intersection of asymmetric synthesis, biocatalysis, computational design, and …
Episode 10: Future Directions in Chiral Agrochemistry Read More »
Introduction The development and use of chiral agrochemicals are not governed by science alone. Policy frameworks, regulatory guidance, and industrial strategy all play decisive roles in shaping how stereochemistry is addressed in crop protection. Over the past three decades, regulators have recognized that enantiomers can differ dramatically in efficacy, toxicity, and environmental fate. This recognition …
Episode 9: Regulatory and Industrial Perspectives on Chiral Agrochemicals Read More »
Precision at the Molecular Level, Sustainability in the Field 🌱 Introduction Sustainable agriculture aims to balance crop productivity with environmental protection and food safety. Agrochemicals play a central role in pest management, but their widespread use has raised concerns about resistance, biodiversity loss, and long-term ecological impacts. Chirality offers a path toward sustainability because enantiopure …
Episode 8: Sustainable Pest Management and Chirality Read More »
When Molecular Handedness Shapes Food Safety: Understanding the Hidden Side of Agrochemical Toxicity. Introduction The toxicity of agrochemicals is a central concern for agriculture, food security, and public health. Chiral agrochemicals complicate this issue further because their enantiomers often differ in both biological activity and toxicological effects. While one enantiomer may efficiently control pests, the …
Episode 7: Toxicity and Food Safety Considerations of Chiral Agrochemicals Read More »