ALL ABOUT SUNSCREENS....π
π Pharmaceutical preparations that attenuate UV wavelength π If not,uv rays will interact with molecules in skin- chromophore to generate photochemical reaction. πSpectrum of UV radiation *Ultraviolet (UV) radiation include UV-A and UV-B radiations. *The primary targets of UV radiation in the skin and their corresponding effects are given below:- UV-B (290-320 nm) Cause most severe damage Directly affects cell DNA and proteins Acute damage will cause sunburn Long-term damage will cause skin cancer UV-A (320-400 nm) Penetrates deeper than UVB Produce reactive oxygen species(ROS) Cause profound immunosuppression Cause tanning, photoaging, skin cancers,exogenous photosensitization and many photodermatoses (including polymorphous light eruption) πWhat is "Critical wavelength"? The wavelength below which 90% of the sunscreen′s UV absorbency occurs π What is a "Broad spectrum sunscreen"? *Critical wavelength more than 370 nm *UVA prote
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