Green extraction of lipids: Exploring the capabilities of subcritical fluid technology

Imagine extracting valuable oils without toxic solvents, without drying the biomass, and without destroying delicate omega-3s. Subcritical fluid technology might just be the green key to unlocking this lipid treasure chest.

Conventional lipid extraction has a dirty secret: it relies on toxic solvents like hexane, demands energy-hungry drying of wet biomass, and often degrades heat-sensitive omega-3 fatty acids. This review shines a spotlight on subcritical fluid technology (SFT) as a sustainable alternative that sidesteps all three pitfalls.

SFT uses non-toxic solvents—water, ethanol, dimethyl ether—at moderate temperatures (100–250°C) and pressures (10–100 bar), staying below critical points. This grants tunable polarity, gas-like diffusivities, and the ability to process wet biomass directly. The result? Selective lipid extraction with yields exceeding 90%, and preservation of thermolabile bioactives like EPA and DHA at over 90%.

Beyond quality, SFT delivers environmental and economic wins, with energy savings of 20–40%. Across microalgae, marine by-products, and oilseeds, it outperforms conventional methods. This review positions SFT as a potential cornerstone for sustainable high-value lipid production in food, nutraceutical, and pharmaceutical industries, while flagging future research needs in scalability and circular bioeconomy integration.

Key Points

• Non-toxic solvents, wet biomass processing, yields >90%
• EPA/DHA retention >90%, energy savings 20-40%
• Sustainable alternative for food, nutraceutical, pharmaceutical industries