Advances in Extraction Techniques for Isolation of Bioactive Compounds from Medicinal Plants: Comparative Evaluation of Conventional and Modern Approaches

Abstract

Natural products derived from medicinal plants remain important sources of bioactive compounds with significant therapeutic potential. Growing resistance to synthetic drugs and associated adverse effects has renewed global interest in plant-based medicines as safer alternatives. Extraction, isolation, and characterization of phytoconstituents form the foundation for the development of pharmaceuticals, nutraceuticals, cosmetics, and functional foods. Conventional extraction techniques such as maceration, percolation, decoction, reflux, and Soxhlet extraction are widely used; however, they often require prolonged extraction times, high solvent consumption, and substantial energy input. In contrast, modern extraction technologies—including ultrasound-assisted extraction, microwave-assisted extraction, supercritical fluid extraction, pressurized liquid extraction, and solid-phase microextraction—offer enhanced efficiency, selectivity, reduced solvent use, and improved environmental sustainability. This study presents a structured comparative analysis of conventional and modern extraction techniques for both non-volatile and volatile plant constituents. Results indicate that modern techniques significantly reduce extraction time and solvent usage while improving yield and purity. However, challenges such as equipment cost and industrial scalability remain. Continuous advancements in green extraction technologies are expected to further enhance sustainable utilization of plant-derived bioactive compounds.