Embracing PMI: Advancing Sustainability in Peptide Synthesis

High Resolution Image Download MS PowerPoint Slide Process mass intensity (PMI) and complete E-factor (cEF) are widely accepted metrics for evaluating the sustainability of chemical processes, yet their routine application in peptide synthesis remains limited. This is primarily due to the perceived complexity and time required for mass accounting across repetitive coupling/deprotection cycles and solvent-intensive operations characteristic of both SPPS and LPPS. In this work, we present a simplified and practical approach for the rapid calculation of PMI and cEF specifically tailored to peptide synthesis workflows. The method is implemented through a user-friendly Excel-based tool that converts routinely recorded experimental parameters such as reaction scale, resin loading/tag, reagent, and solvent consumption into quantitative sustainability metrics using built-in formulas. The streamlined workflow allows PMI and cEF to be calculated within minutes without the need for specialized software or extensive additional data collection. By lowering the barrier to quantitative sustainability assessment, this method facilitates the routine inclusion of green metrics in method development, process optimization, and reporting. Importantly, the approach is equally relevant to academic and industrial laboratories, supporting informed decision-making and fostering the broader adoption of sustainability principles in peptide synthesis.