Development of a new in vitro method to evaluate the photoprotective sunscreen activity of plant extracts against high UV-B radiation

► We propose a new in vitro method to evaluate the sunscreen activity of plant extracts. ► We evaluate the photoprotective activity of samples against high UV-B radiation. ► We use sodium magnesium chlorophyllin (SMC) as target molecule of UV-B radiation. ► We measure protective effect of sunscreens through limitation of SMC degradation. ► This new method is a good alternative to cosmetic procedures.