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Folic acid is a synthetic form of the B group vitamin known as folate, which is essential for a variety of physiological processes
and plays an important role in the prevention of neural tube defects. However, it decomposes when exposed to UV light.
Protein unfolding or decomposition occurred at the same time, due to interaction with folic acid photoproducts and generation
of singlet oxygen. In this study, protective effect of resveratrol against photodecomposition of folic acid and decompositioninduced
β-lactoglobulin structural change were investigated using fluorescence and absorbance spectroscopy, circular dichroism
and high performance liquid chromatography. It was found that resveratrol at 10 μM could inhibit photodecomposition of 10
μM folic acid and also the resulting structural change of β-lactoglobulin whether the polyphenol was added before or during
UV irradiation. Meanwhile, a decrease in the conversion rate of resveratrol from the trans- to the cis-form and an increase in
the degradation of both trans- and cis-resveratrol were detected. The results suggest that resveratrol could be used to control the
photodecomposition process of folic acid and prevent against folic acid-induced protein structural change, as it is an effective
active oxygen quencher during irradiation.
Wusgal is a PhD candidate at State key lab of Food Science and Technology, Jiangnan University. Her research interests focus on prevention of decomposition of folic acid and the decomposition-induced protein structural change.