Crucial challenges in the development of green extraction technologies to obtain antioxidant bioactive compounds from agro-industrial by-products

Did you know that 30–50% of agricultural foodstuffs are discarded as by-products, contributing to 8% of greenhouse gas emissions? Yet these very wastes hide a treasure trove of health-boosting compounds—if we can extract them the right way.

The food industry churns out waste on a colossal scale, but those discarded peels, seeds, and pulps are far from useless. They are packed with polyphenols—natural antioxidants that can bolster our body's defenses against cardiovascular and neurodegenerative diseases. The challenge? Extracting these valuable molecules efficiently without harming the planet.

Enter green extraction technologies. Scientists are exploring a suite of innovative methods, from ultrasound-assisted extraction to supercritical fluids, and even neoteric solvents like natural deep eutectic solvents (NADES). These approaches aim to optimize energy, solvents, and pressure, making the process cheap, fast, and eco-friendly.

But the road to commercial success is steep. The paper reviews these technologies, weighing their potential and the hurdles ahead. The goal is clear: turn agro-industrial by-products into functional ingredients that benefit both human health and the environment. The future of food—and waste—depends on getting this right.

Key Points

• Agro-industrial by-products are rich in antioxidant polyphenols.
• Green extraction methods optimize energy, solvents, and pressure.
• Commercialization faces challenges but promises eco-friendly ingredients.