Related Experiment Videos
Interactions between flavonoids and proteins: effect on the total antioxidant capacity
Mariken J T J Arts1, Guido R M M Haenen, Lonneke C Wilms
1Department of Pharmacology and Toxicology, Faculty of Medicine, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands. Mariken.Arts@farmaco.unimaas.nl
Journal of Agricultural and Food Chemistry
|February 21, 2002
Summary
Tea flavonoids and proteins interact, reducing overall antioxidant capacity. This masking effect, dependent on specific flavonoids and proteins, highlights how the food matrix impacts antioxidant efficacy.
Area of Science:
- Food Chemistry
- Nutritional Science
- Biochemistry
Background:
- Flavonoids are recognized for their potent antioxidant properties.
- Flavonoid-protein interactions are known to occur.
- The impact of these interactions on antioxidant efficacy requires further investigation.
Purpose of the Study:
- To investigate the effect of tea flavonoid-protein interactions on antioxidant capacity.
- To quantify the antioxidant capacity of tea components and proteins separately and in combination.
- To determine if the combined antioxidant capacity is additive or if interactions cause masking.
Main Methods:
- Utilized the Trolox equivalent antioxidant capacity (TEAC) assay.
- Measured the antioxidant capacity of green and black tea components.
- Assessed interactions with alpha-, beta-, and kappa-casein and albumin proteins.
Main Results:
- The antioxidant capacity of tea flavonoids and proteins was not additive when combined.
- A significant portion of the total antioxidant capacity was masked due to flavonoid-protein interactions.
- Masking varied depending on the specific flavonoid and protein involved.
- Epigallocatechin gallate and gallic acid showed the highest masking with beta-casein.
Conclusions:
- Flavonoid-protein interactions in a food matrix can significantly reduce the measurable antioxidant capacity.
- The efficacy of antioxidants is influenced by the surrounding matrix components.
- Understanding these interactions is crucial for predicting the bioavailability and effectiveness of dietary antioxidants.