A Sustainable Approach for the Valorization of Underutilized Date Fruits

Area of Science:

• Food Chemistry
• Phytochemistry
• Agricultural Science

Background:

• Secondary date fruit varieties are typically undervalued and discarded.
• These fruits possess similar phytochemical profiles to primary varieties, including phenols and dietary fiber.
• Understanding the chemical composition changes during ripening is crucial for valorization.

Purpose of the Study:

• To characterize the phenolic composition and antimicrobial activity of secondary date fruit varieties.
• To evaluate the potential of date fruit byproducts as sources of prebiotic and antioxidant fiber.
• To explore the valorization of discarded date fruits into value-added products.

Main Methods:

• Date fruits were collected at different ripening stages (Khalal, Rutab, Tamer) and from ornamental trees.
• Aqueous and ethanolic extracts were prepared and analyzed for phenolic content.
• Antimicrobial activity was assessed using purified extracts, and fibrous residues were characterized.

Main Results:

• Phenolic content varied between aqueous (decreasing with ripening) and ethanolic extracts (higher content).
• Chelidonic acid was the major compound; flavonoids were significant in ethanolic extracts.
• Tamer-stage extracts exhibited the highest antimicrobial activity, particularly against Gram-positive bacteria.
• Fibrous residues showed potential as a source of prebiotic arabinoxylans and antioxidant fiber.

Conclusions:

• Secondary date fruits are a promising source of valuable phytochemicals, including phenols and fiber.
• Valorization of these fruits, especially at the Tamer stage, can yield products with significant health benefits.
• Date fruit byproducts can be utilized for prebiotic and antioxidant applications.