Kinetic Modeling of Physicochemical Changes in Protein Bars Enriched with Aqueous and Ethanolic Rice Bran Extracts During Storage

Protein bars are among the popular, healthy, and safe products; however, they may undergo physicochemical changes during storage, leading to reduced attractiveness and consumer acceptance. The use of natural compounds with antioxidant activity, particularly plant extracts, is considered an effective approach to control and mitigate undesirable changes. In this study, aqueous and ethanolic extracts of rice bran were employed as functional ingredients due to their antioxidant properties and the presence of phenolic and flavonoid compounds, aiming to improve the quality of protein bars. The stability of the rice bran extract–enriched products was evaluated in comparison with the control sample over a ۲۸-day storage period at ambient temperature, with assessments conducted at ۷-day intervals. Moisture, water activity, acidity, peroxide value, and color changes were measured, and suitable kinetic models were determined using the coefficient of determination and other error indices. The findings indicated that the addition of rice bran extracts, particularly the ethanolic form, effectively reduced undesirable changes, enhanced stability, and preserved higher product quality during storage. These results suggest that the incorporation of safe and natural compounds can improve the functional properties of food products and facilitate the development of healthier and more sustainable products.

کلیدواژه ها:

Rice bran extract ، Antioxidant ، Shelf life ، kinetic modeling