Valorization of Rice By-Products Through Conventional and Emerging Extraction Technologies: Trends, Challenges, and...

Area of Science:

• Agricultural Science
• Food Science
• Biotechnology

Background:

• Rice by-products (rice bran, husk, straw) are abundant but underutilized resources.
• These fractions contain valuable proteins, lipids, fibers, and bioactive compounds.
• Industrial application is hindered by enzymatic degradation, structural complexity, and inefficient extraction methods.

Purpose of the Study:

• To review and compare extraction technologies for rice by-products.
• To explore the valorization of rice by-products into high-value ingredients.
• To guide technology selection for sustainable rice by-product utilization.

Main Methods:

• Systematic review of extraction technologies: conventional, green, and hybrid approaches.
• Analysis of cascade and integrated strategies for enhanced extraction efficiency.
• Mapping of extracted fractions to application-ready ingredients.

Main Results:

• Comparison of various extraction methods, including green technologies like pressurized liquid, supercritical CO2, and ultrasound-assisted extraction.
• Identification of hybrid and integrated strategies for improved selectivity and reduced resource consumption.
• Demonstration of converting rice by-products into functional ingredients like lipid concentrates, protein hydrolysates, and prebiotic oligosaccharides.

Conclusions:

• Advanced and integrated extraction technologies are key to overcoming limitations in rice by-product valorization.
• Standardization, techno-economic analysis, and regulatory harmonization are crucial for commercial deployment.
• Valorization of rice by-products supports sustainable and circular bioeconomy principles.