我们研究了由于光化学过程，不同类型的防晒膜的防晒系数（SPF）如何随“标准”太阳辐射而变化。我们结合使用了化学光度法，测量和建模方法，以估算阿伏苯宗（AVB）和异戊基p发生的光处理的整体量子产率。在丙烷1,2-二醇（PG）或角鲨烷（SQ）中的-甲氧基肉桂酸酯（MC）。使用获得的参数，我们已经开发了模型来计算由多个UV滤光片溶液组成的非散射防晒膜和基于Pickering乳液的高散射防晒膜的膜光谱演化和SPF值。使用不同的实验室光源，所有胶片的模型计算与根据辐照时间测量的胶片光谱非常吻合。最后，使用估算的参数和经过实验验证的模型，我们能够定量预测体外由于使用“标准”日光照射而引发的光化学过程，包含UV过滤剂浓度的任何设定组合的不同胶片类型的SPF值将随时间变化。这为合理设计和优化新防晒霜配方提供了有用的工具。

"点击查看英文标题和摘要"

We have investigated how the sun protection factor (SPF) of different types of sunscreen film varies with “standard” solar irradiation due to photochemical processes. We have used a combination of chemical actinometry, measurement and modelling to estimate the overall quantum yields for the photoprocesses occurring for avobenzone (AVB) and isopentyl p-methoxycinnamate (MC) in either propane-1,2-diol (PG) or squalane (SQ) as solvent. Using the obtained parameters, we have developed models to calculate the evolution of the film spectra and derived SPF values for both non-scattering sunscreen films consisting of solutions of multiple UV filters and for highly scattering Pickering emulsion based sunscreen films. Model calculations for all films are in excellent agreement with film spectra measured as a function of irradiation time using different laboratory light sources. Finally, using the estimated parameters and experimentally validated models, we are able to quantitatively predict how the in vitro SPF values for different film types containing any set combination of UV filter concentrations will vary with time due to photochemical processes induced by irradiation with “standard” sunlight. This provides a useful tool for the rational design and optimisation of new sunscreen formulations.