Biodegradation of oxalic acid from spinach using cereal radicles

Area of Science:

• Food Science
• Biotechnology
• Nutritional Science

Background:

• High oxalate intake poses health risks, particularly for infants and susceptible adults.
• Spinach, a nutritious vegetable, is notably high in oxalates.
• Conventional oxalate reduction methods like blanching are often insufficient.

Purpose of the Study:

• To explore a novel biological method for oxalate reduction using cereal seedlings.
• To evaluate the efficacy of oxalate oxidase from rye, barley, and wheat seedlings in degrading oxalate.
• To assess the potential for oxalate removal from various food products and industrial water.

Main Methods:

• Utilizing rye, barley, and wheat seedlings/radicles containing natural oxalate oxidase.
• Testing oxalate degradation rates at varying concentrations (0.25 mM), temperatures (18-55°C), and pH (3.5).
• Applying the method to commercial deep-frozen spinach and other potential sources like juices and process waters.

Main Results:

• Rapid degradation of dissolved oxalate observed with cereal radicles (70% in 100 min).
• Near-complete degradation of soluble oxalate in spinach achieved at pH 3.5, reducing total oxalate by 50%.
• Effective oxalate degradation observed across a temperature range of 18-55°C.

Conclusions:

• Cereal seedlings offer a viable biological solution for significant oxalate reduction.
• The method is effective for spinach and potentially applicable to other vegetables, juices, and industrial applications.
• This approach could enhance food safety and nutritional quality by lowering oxalate content.