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Phytophotodermatitis: an experimental study using the chamber method

R Suhonen

    Contact Dermatitis
    |June 1, 1977
    PubMed
    Summary
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    Phytophotodermatitis from Dictamnus albus requires at least 30 minutes of sun exposure for a reaction. Optimal results were achieved with 30-120 minutes of exposure, with the phototoxic effects fading quickly.

    Area of Science:

    • Dermatology
    • Botany
    • Photobiology

    Background:

    • Phytophotodermatitis is a skin reaction caused by contact with certain plants followed by exposure to ultraviolet (UV) light.
    • Dictamnus albus, commonly known as the gas plant, is suspected to cause phytophotodermatitis.

    Purpose of the Study:

    • To experimentally induce and characterize phytophotodermatitis using Dictamnus albus.
    • To determine the optimal conditions for inducing phototoxic reactions.

    Main Methods:

    • Crushed Dictamnus albus leaves were applied to human skin.
    • The application sites were occluded for varying durations (30 min to 24 h) and then exposed to UVA light.
    • The intensity of the phototoxic reaction was assessed.

    Main Results:

    Related Experiment Videos

    • A minimum occlusion time of 30 minutes was required for a phototoxic reaction.
    • Optimal reactions were observed with 30-120 minutes of occlusion.
    • The phototoxic substance absorbed rapidly (10-15 min) and its effects diminished within 30 minutes post-exposure.
    • UVA energy of 0.3 J/cm2 was sufficient under optimal conditions.
    • Water enhanced the reactions, and deep-freezing did not eliminate phototoxicity for up to 4 months.

    Conclusions:

    • Dictamnus albus can induce experimental phytophotodermatitis.
    • Specific occlusion times and UVA energy levels are critical for eliciting phototoxic responses.
    • The phototoxic properties of Dictamnus albus are relatively stable and rapidly absorbed by the skin.