Background: Ultraviolet B (UV-B) radiation is a promising and environmentally friendly
technique, which in a low flow rate, can induce bioactive compound synthesis. This work aimed at
evaluating the effectiveness of post-harvest UV-B treatment in order to improve carotenoid content in
climacteric fruits like persimmon and guava fruits.
Method: The fruits were harvested at commercial maturity and placed into climatic chambers equipped
with UV-B lamps. For control treatment, the UV-B lamps were covered by a benzophenone film, known
to block the radiation. This radiation was applied during 48 hours and fruits were sampled at 25, 30 and
48 hours of each treatment. HPLC analysis was performed to separate and identify carotenoid compounds
from fruit skin after a saponification process.
Results: Fruit from 30 hours treatment began to present a carotenoid accumulation since the majority of
analyzed compounds exhibited its synthesis stimulated from this time on. In persimmon skin, it was
observed that the maximum content was reached after 48 hours of UV-B treatment.
Conclusion: These results suggest that this post-harvest UV-B treatment can be an innovative and a
viable method to induce beneficial effects on guava and mainly on persimmon fruit.
Keywords: Climacteric fruits, Psidium guajava, Diospyros kaki, UV-B radiation, postharvest, carotenoid
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