New noninvasive approach assessing <i>in vivo</i> sun protection factor (<scp>SPF</scp>) using diffuse reflectance spectroscopy (<scp>DRS</scp>) and <i>in vitro</i> transmission

Abstract

This new methodology provides a new approach to determine SPF values without the extensive UV irradiation procedures (and biological responses) currently used to establish sunscreen efficacy. Further work will be conducted to establish methods for evaluation of products that are not photostable.