Sustainable Extraction and Purification of Phytochemicals: A Review of Green Solvents and Techniques

The importance of phytochemicals in medicine, nutraceuticals, and cosmetics has
recently drawn considerable attention toward their sustainable extraction and
purification. This review presents the progress in green solvents and
methodologies underlined by the drawbacks associated with conventional
methods. Phytochemicals are bioactive substances derived from plants that are
important for medicinal and commercial purposes. However, most classical
methods of extraction and purification involve hazardous solvents and energyintensive
operations, raising environmental and safety concerns. Green solvents,
including ionic liquids, deep eutectic solvents, and bio-based solvents, offer
environmentally friendly alternatives with high efficiency and low toxicity. These
include Supercritical fluid extraction (SFE), Ultrasound-Assisted Extraction
(UAE), Microwave-Assisted Extraction (MAE), Pressurized liquid extraction
(PLE), and Enzyme-Assisted Extraction (EAE), all of which are advanced green
extraction methodologies. These methods afford higher extraction yields while
simultaneously reducing the energy consumption and waste generation.
Sophisticated purification strategies, including chromatographic techniques,
membrane-based purification, and adsorption-desorption procedures, were
evaluated for their compatibility with eco-friendly extraction processes. A
comparison of the various techniques shows their efficacy, cost, and
environmental friendliness. The discussion covers future perspectives, which
pinpoint that the development of green solvent formulations, integration of
extraction and purification systems, and overcoming of regulatory and scalability
challenges are highly needed. This study will be able presents a comprehensive
review of sustainable methodologies for the extraction and purification of
phytochemicals, which would further help in devising greener, safer, and more
efficient approaches in natural product research.