Conventional and Innovative Methods for Pectin Extraction from Agro-industrial By-products

Pectin, a versatile biopolymer found in plant cell walls, is crucial in the food, pharmaceutical, and cosmetic industries due to its gelling, thickening, and stabilizing properties. As demand increases, efficient and sustainable extraction methods are essential to maximize yield and quality from agro-industrial byproducts. This review critically evaluates and compares conventional and emerging pectin extraction techniques, focusing on their potential to enhance yield and quality while promoting sustainability. The synthesis of data includes traditional methods (acid and enzymatic processes) and novel assisted extractions such as Microwave (MAE), Ultrasound (UAE), High Hydrostatic Pressure (HHP), Manosonication Extraction, Radio Frequency, Electromagnetic Induction Heating, High-Speed Shearing, Deep Eutectic Solvents (DES), Subcritical Water (SWE), Ohmic Heating, Pulsed Electric Fields, Moderate Electric Fields and Induced Voltage (IVAE). The analysis encompasses yield, quality parameters, processing time, and environmental impact. Results indicate that modern extraction methods outperform traditional techniques in terms of yield and quality. Notably, MAE and UAE achieve similar yields in less time compared to traditional methods, while HHP and IVAE methods produce pectin with enhanced gelling properties. DES and SWE extractions emerge as environmentally friendly alternatives, utilizing biodegradable solvents. Despite their advantages, these innovative techniques face challenges such as high initial costs and the need for precise parameter control. This review underscores the transformative potential of these methods in pectin production, offering both performance enhancements and environmental benefits. Future research should prioritize scaling up these techniques for industrial applications, optimizing process parameters, and conducting comprehensive techno-economic analyses to balance efficiency, quality, and economic viability.