Posted on Sep 03, 2012, 6 a.m.
Strawberry extract added to skin cell cultures acts as a protector against ultraviolet radiation, as well as increasing its viability and reducing damage to DNA.
The earth receives the sun's ultraviolet A (long-wave) and ultraviolet B (shortwave) rays. Exposure to UV-A radiation is known to induce discrete lesions in DNA and the generation of free radicals that lead to a wide array of skin diseases. Strawberry (Fragaria × ananassa) contains a number of polyphenols with strong antioxidant and anti-inflammatory activities. Maurizio Battino, from the Universita Politecnica delle Marche (Italy), and colleagues prepared human skin cell cultures (fibroblasts) and added strawberry extract in different concentrations (0.05, 0.25 and 0.5 mg/ml), the only exception being the control extract. Using ultraviolet light, the samples were then exposed to a dose "equivalent to 90 minutes of midday summer sun in the French Riviera." Data confirm that the strawberry extract, especially at a concentration of 0.5 mg/ml, displays photoprotective properties in those fibroblasts exposed to UVA radiation, it increases cell survival and viability and decreases damage in the DNA when compared with control cells. The study authors conclude that: “our data show that strawberry contains compounds that confer photoprotective activity in human cell lines and may protect skin against the adverse effects of UV-A radiation.”
Francesca Giampieri, Jose M. Alvarez-Suarez, Sara Tulipani, Ana M. Gonzales-Paramas, Celestino Santos-Buelga, Maurizio Battino, et al. “Photoprotective Potential of Strawberry (Fragaria × ananassa) Extract against UV-A Irradiation Damage on Human Fibroblasts.” J. Agric. Food Chem., 2012, 60 (9), pp 2322–2327.