The study, "Green Analytical Chemistry and Metrics for Sustainable Pharmaceuticals: A Comprehensive Review," was carried out by K. Archana, G. Vigneshwaran, and M. Sumithra in the Journal of Current Topics in Chemistry.
A new comprehensive review maps twenty years of progress in green analytical chemistry, critically evaluates the tools currently used to measure how environmentally sound a pharmaceutical testing method is, and makes the case that no single tool is sufficient — calling instead for an integrated multi-metric approach that covers the full environmental, safety, and resource footprint of analytical practice in the pharmaceutical industry.
Why Pharmaceutical Analysis Has an Environmental Problem
Every stage of a pharmaceutical product's life — from testing raw ingredients through to quality-checking the finished tablet or injection — depends on analytical chemistry. These tests are not optional; they underpin drug safety, regulatory compliance, and batch release decisions. Yet the laboratory practices behind them have historically been resource-heavy and environmentally costly. Many conventional analytical methods rely on large volumes of hazardous organic solvents, generate significant quantities of chemical waste, and consume substantial energy. For an industry that operates at global scale and runs these tests continuously, the cumulative environmental impact is considerable. Green Analytical Chemistry (GAC) — a branch of the broader green chemistry framework first articulated by Paul Anastas — has emerged as the field's answer to this problem, applying the principles of sustainability directly to how analytical measurements are designed and carried out, rather than only to the synthesis of chemical compounds.
Two Decades of Green Metrics: What Has Been Built and How Well Does It Work
The central contribution of this review is a structured, critical comparison of the measurement tools that have been developed over the past twenty years to assess how "green" an analytical method actually is. The authors examine a range of established metrics — including NEMI, Eco-Scale, GSST, HPLC-EAT, AMVI, GAPI, and AGREE — alongside newer entrants such as the PMI-LCA framework, the RGB 12 Algorithm, and the NQS Index, assessing each based on its scope, methodology, and practical usability in a pharmaceutical context.
The review traces a clear generational shift in how these tools work. Earlier instruments relied primarily on qualitative pictograms—colour-coded visual indicators that flag whether a method uses hazardous reagents or generates problematic waste, but offer no numerical basis for comparison between methods. More recent second-generation metrics move toward quantitative, multi-criteria scoring frameworks that attempt to weigh environmental impact, analytical performance, and operational practicality together on a single scale, making them more informative but also more complex to apply. The authors find that while this evolution represents genuine progress, significant gaps remain. Most current tools provide only partial lifecycle coverage, meaning they capture environmental impacts at certain points in the analytical process but not across the entire lifecycle. There is also no standardised scoring convention shared across tools, which means that the same method evaluated with different metrics can produce different conclusions. This problem complicates both regulatory interpretation and cross-study comparison. A further limitation identified is the near-absence of digital integration and computational or machine-learning-enhanced features, which restricts the ability of these tools to support automated method screening or predictive environmental assessment.
The Case for an Integrated Toolbox — and What Needs to Happen Next
The review's central argument is that the field has reached a point where relying on any single greenness metric is no longer defensible. Each existing tool captures a different slice of what it means for an analytical method to be sustainable—some focus on solvent hazard, others on waste generation, energy consumption, or operator safety—and none covers all of these dimensions comprehensively on its own. The authors propose that a genuinely robust assessment framework must integrate multiple complementary metrics into a unified toolbox, one capable of evaluating analytical sustainability across environmental, occupational safety, and resource efficiency dimensions simultaneously. This would not only produce more reliable and comparable assessments, but would also give pharmaceutical laboratories a clearer, more actionable picture of where their methods fall short and how to improve them. The authors identify the development of standardised scoring conventions, the extension of lifecycle coverage to encompass the full analytical workflow, and the incorporation of digital and computationally assisted evaluation capabilities as the three most pressing priorities for the next phase of green analytical chemistry research. Corresponding author Dr. K. Archana and co-authors G. Vigneshwaran and M. Sumithra position this review as a foundation for that work, offering the pharmaceutical analysis community a consolidated reference point from which more integrated and rigorous sustainability assessment can be built.
Article title: Green Analytical Chemistry and Metrics for Sustainable Pharmaceuticals: A Comprehensive Review
DOI: 10.2174/0129504023449165260615103853
Read the published article here: https://bit.ly/4yAuLzX
Current Topics in Chemistry
10.2174/0129504023449165260615103853
Green Analytical Chemistry and Metrics for Sustainable Pharmaceuticals: A Comprehensive Review