Rice protein offers excellent nutritional value and low allergenicity, making it a staple for many dietary formulations. However, poor rice protein functionality often limits its broader application in the food and nutraceutical industries. A new study published in the Journal of Food Science demonstrates how combining ultrasonic pretreatment with epigallocatechin gallate (EGCG) can revolutionize these properties.

The Impact of Ultrasound on Rice Protein Functionality

Ultrasonic waves induce a significant structural transformation in rice protein. Specifically, this pretreatment induces a shift in the β-lamellar structure, which effectively accelerates the conversion to rice protein amyloid fibrils (RPAFs). When researchers combined these ultrasonic-treated fibrils with EGCG, the resulting complex exhibited remarkable physical improvements. This combination showed the highest viscosity and superior emulsifying and foaming properties.

Specifically, the study compared the combined treatment (UFE) to native protein. The emulsifying activity index (EAI) nearly doubled, rising from 14.3 to 27.3 m/g. Furthermore, the foaming capacity (FC) saw a dramatic increase from 14.8% to 42.5%. These improvements suggest that modified rice protein could serve as a highly stable ingredient in complex food matrices.

Unprecedented Antioxidant Capacity

Beyond physical texture, the combined treatment significantly enhanced antioxidant activity. The ABTS scavenging rate jumped from 35.6% to 92.8%, while the DPPH scavenging rate rose from 53.3% to 92.3%. Consequently, these findings demonstrate that EGCG and ultrasound work synergistically to provide potent health benefits. This method offers a potential strategy for developing high-value protein formulations that combat oxidative stress.

For clinicians and nutritional experts, these findings are noteworthy. Hypoallergenic proteins like rice can now be engineered into more effective delivery vehicles or functional foods. Enhanced stability and antioxidant capacity are vital for managing chronic conditions where nutrition plays a central role. Moreover, this approach provides a sustainable and efficient way to process plant-based proteins.

FAQs

Why is rice protein functionality difficult to manage?

Native rice protein has high hydrophobicity and a compact structure. These traits lead to low solubility and poor emulsifying properties, which ultrasonic pretreatment helps to overcome by unfolding the protein molecules.

How does EGCG improve rice protein fibrils?

EGCG, a potent polyphenol from green tea, binds to the protein fibrils. This interaction not only stabilizes the structure but also contributes massive antioxidant properties to the final complex.

Is this technology relevant for clinical nutrition?

Yes. By creating hypoallergenic, highly functional, and antioxidant-rich proteins, this technology supports the development of specialized diets for patients with allergies or high oxidative stress levels.

Disclaimer: This content is for informational and educational purposes only. It does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

1. Shen L et al. Effect of Ultrasonic Pretreatment and EGCG on the Structural and Functional Properties of Rice Protein Amyloid Fibrils. J Food Sci. 2026 May undefined. doi: 10.1111/1750-3841.71110. PMID: 42062787.

2. Ni Y, et al. Enhancement of physicochemical and techno-functional properties of soy protein isolate amyloid fibrils by moderate ultrasonic pretreatment. Ultrason Sonochem. 2024 Nov. doi: 10.1016/j.ultsonch.2024.107084.

3. Wang Y, et al. Interaction between rice bran albumin and epigallocatechin gallate and their physicochemical analysis. J Food Sci Technol. 2015 Oct. doi: 10.1007/s13197-015-1748-0.