Abstract
Table grapes were irradiated with UV nanosecond laser pulses in searching for resonant photo-elicitation of trans-resveratrol, a known antioxidant compound naturally produced by grapevines and other plants. To this end, the irradiation time as well as the wavelength dependence of the induced trans-resveratrol content was investigated by comparing the elicitation level of this compound at two laser wavelengths. One wavelength was selected right at the maximum of the absorption band (302.1 nm, the resonant wavelength for this compound) while the second was selected (300 nm, a non-resonant wavelength) such that trans-resveratrol absorption is negligible. It was found that the resonant irradiation enhances the resveratrol content in grapes by up to six times more than that of non-resonant irradiation, the rest of the conditions being the same. This work demonstrates how selective laser excitation of fruits can open new possibilities for the development of functional foods with enhanced nutritional and beneficial properties.
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42.62.-b; 82.50.Hp
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Jiménez Sánchez, J., Crespo Corral, E., Orea, J. et al. Elicitation of trans-resveratrol by laser resonant irradiation of table grapes. Appl. Phys. B 87, 559–563 (2007). https://doi.org/10.1007/s00340-007-2591-0
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DOI: https://doi.org/10.1007/s00340-007-2591-0