The present invention provides a method and apparatus for measuring the effectiveness of a sunscreen composition or other skin preparation in reducing the exposure of human skin to UVA radiation, wherein differential electron spin resonance spectroscopy is used to quantify the extent of UVA-induced ascorbate or other measurable radical production in the shielded skin, in comparison with reference, preferably unshielded, skin.
本发明提供了一种用于测量防晒组合物或其他皮肤制剂在减少人体皮肤暴露于 UVA 辐射中的有效性的方法和装置,其中差分电子自旋共振光谱法用于量化与参考皮肤(最好是未屏蔽皮肤)相比,屏蔽皮肤中 UVA 诱导的
抗坏血酸或其他可测量自由基产生的程度。