The present research aimed to determine the sun protection
factor (SPF) values of some sunscreen formulations used in cosmetics by
ultraviolet spectrophotometer. The efficacy of a sunscreen is usually expressed
by the sun protection factor (SPF), which is defined as the UV energy required
to produce a minimal erythemal dose (MED) in protected skin, divided by the UV
energy required to produce a MED in unprotected skin. A sunscreen's ability to
prevent sunburn is measured in a lab setting by its sun protection factor
(SPF). The greater the SPF, the more protection the sunscreen provides against
UV rays. SPF is determined by the spectrophotometric method reported by Mansur
et al. Hydro-alcoholic dilutions of oils were prepared and in vitro
photoprotective activity was studied by UV spectrophotometric method in the
range of 290-320 nm. It was observed that the SPF values for cosmetic
formulations were between 13 and 16. Among the various sunscreen formulations,
SPF values were compared. The study is helpful in the selection of sunscreen
formulations used in cosmetics with better safety and high SPF values. To
develop sunscreens with better safety and high SPF, the formulator must
understand the physicochemical principle, not only the UV absorbance of the
actives but also vehicle components, such as esters, emollients, emulsifiers
and fragrances used in the formulation, since sunscreens can interact with
other components of the vehicle, and these interactions can affect the efficacy
of sunscreens.
Author(s)details:-
Dr. Masheer Ahmed
Khan
School of Pharmacy, Devi Ahilya Vishwavidyalaya, Indore, MP, India.
Dr. Gajanand Engla
School of Pharmacy, Devi Ahilya Vishwavidyalaya, Indore, MP, India.
Dr. Love Kumar Soni
School of Pharmacy, Devi Ahilya Vishwavidyalaya, Indore, MP, India.
Please See the book
here :- https://doi.org/10.9734/bpi/prrat/v2/3802G
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