GREEN ANALYTICAL CHEMISTRY IN MODERN PHARMACEUTICAL QUALITY CONTROL: PRINCIPLES, EMERGING TECHNOLOGIES, INDUSTRIAL IMPLEMENTATION, AND REGULATORY PERSPECTIVES

The pharmaceutical industry is undergoing a paradigm shift toward sustainable manufacturing and environmentally responsible quality assurance, driven by increasing regulatory expectations and global commitments to green chemistry. Green Analytical Chemistry (GAC) has emerged as a transformative approach to pharmaceutical quality control by minimizing the consumption of hazardous chemicals, reducing waste generation, improving energy efficiency, and enhancing analytical performance without compromising data quality or regulatory compliance. This review critically examines the evolving role of GAC in modern pharmaceutical quality control, with particular emphasis on emerging analytical technologies, industrial implementation strategies, regulatory considerations, and future research directions. The review discusses the fundamental principles and metrics of GAC, including Analytical Eco-Scale, Green Analytical Procedure Index (GAPI), Analytical GREEnness (AGREE), and complementary assessment tools for evaluating analytical sustainability. Recent advancements in environmentally benign analytical methodologies — including green high-performance liquid chromatography (HPLC), ultra-high-performance liquid chromatography (UHPLC), supercritical fluid chromatography (SFC), capillary electrophoresis (CE), spectroscopic techniques, miniaturized and microfluidic analytical systems, ambient ionization mass spectrometry, and solvent-free or solvent-reduced sample preparation approaches — are comprehensively evaluated for their applicability in pharmaceutical quality control. Furthermore, the integration of Process Analytical Technology (PAT), Quality by Design (QbD), chemometrics, artificial intelligence (AI), machine learning (ML), automation, and digital analytical platforms is explored as a means of improving method robustness, real-time monitoring, predictive quality assessment, and sustainable decision-making. The review also highlights the opportunities and challenges associated with industrial adoption of GAC, including method validation, lifecycle management, technology transfer, economic feasibility, workforce training, and harmonization with international regulatory expectations. Particular attention is given to current regulatory frameworks established by ICH, the United States Pharmacopeia (USP), the European Pharmacopoeia (Ph. Eur.), and other global agencies, while identifying existing gaps in the standardization and regulatory acceptance of green analytical methodologies. Overall, this review provides a comprehensive and critical perspective on how Green Analytical Chemistry is reshaping pharmaceutical quality control by integrating sustainability with analytical excellence. It underscores the necessity for collaborative efforts among academia, industry, and regulatory authorities to accelerate the implementation of greener analytical practices, thereby supporting environmentally sustainable pharmaceutical development while maintaining the highest standards of product quality, safety, and regulatory compliance.