Efficient Green Extraction of Nutraceutical Compounds from Nannochloropsis gaditana: A Comparative Electrospray Ionization LC-MS and GC-MS Analysis for Lipid Profiling

Microalgae are tiny factories of health-boosting compounds, but their tough cell walls keep the good stuff locked away. Now, green chemistry has found a way to crack them open—without harming the planet.

Imagine a microscopic organism that produces a treasure trove of polar lipids and carotenoids—compounds prized by the food, cosmetic, and nutraceutical industries. Nannochloropsis gaditana, a marine microalga, is exactly such a natural factory. But there's a catch: its rigid cell wall acts like a fortress, making extraction difficult.

In this study, researchers employed an ultrasound-assisted enzymatic pretreatment to weaken the cell wall, then compared various green extraction methods against traditional ones. The pretreated biomass was analyzed using advanced LC-MS and GC-MS techniques to identify and characterize the valuable compounds.

The results were striking. The pretreatment significantly enriched the polar lipid content in all extracts, regardless of the extraction method used, although concentrations varied. Pressurized liquid extraction and microwave-assisted extraction yielded the highest overall amounts, while ultrasound-assisted extraction produced the highest percentage of glycolipids. These green techniques proved more effective than traditional extraction, offering a sustainable path to unlock microalgae's potential.

Key Points

• Ultrasound-enzymatic pretreatment boosts polar lipid extraction.
• Green methods beat traditional extraction for yields.
• Pressurized liquid and microwave extraction give highest yields.