Qu Xin, Zhao Xiaomin, Chen Zhihua
J Cosmet Sci. 2016 Mar-Apr;67(2):101-08.
A new in vitro sun protection factor (SPF) test method to determine the efficacy of sun care products is proposed and evaluated. Based on ultraviolet (UV) dose cumulate response protocols, the new method employs Gafchromic EBT3 film, a self-developing dosimetry film originally created for applications in radiotherapy. Unlike the current standardized method, a UV spectrophotometer is not required. In vitro SPF values of 15 commercial products were measured with EBT3 film and compared with labeled in vivo SPF values. It is apparent that the new method is accurate, cost-effective, and reproducible. These results can be seen across sun care product lines, including sunscreen lotions, blemish balm (BB) creams, foundations, and sprays with organic and/or inorganic UV filters.
本文提出并评估了一种用于测定防晒产品功效的新型体外防晒系数（SPF）测试方法。基于紫外线（UV）剂量累积响应方案，该新方法采用了Gafchromic EBT3薄膜，这是一种最初为放射治疗应用而开发的自显影剂量测定薄膜。与当前的标准化方法不同，该方法不需要紫外线分光光度计。使用EBT3薄膜测量了15种商业产品的体外SPF值，并与标记的体内SPF值进行了比较。显然，新方法准确、经济高效且可重复。这些结果在各类防晒产品线中均可见，包括含有有机和/或无机紫外线过滤剂的防晒乳液、遮瑕膏（BB）霜、粉底和喷雾。
