ABSTRACT
This study evaluates the accuracy of SPF labelling in seven sunscreen foundations purchased online, consisting of five BPOM-registered and two unregistered samples. Accurate SPF labelling is crucial to ensure effective protection against harmful UV radiation, which can cause skin damage such as photoaging, sunburn, and an increased risk of skin cancer. The research began by optimising analytical methods to determine the appropriate solvent and wavelength for the UV filter octyl methoxycinnamate (OMC). Validation confirmed that a 96% ethanol-chloroform (1:1) solvent with a wavelength of 309.5 nm was effective. The method demonstrated high linearity (r=0.9996), with limits of detection (LOD) and quantitation (LOQ) at 0.190 μg/mL and 0.635 μg/mL, respectively. Precision (CV=0.96%) and accuracy (100.05%-101.37%) met acceptable standards. The SPF results were as follows: A=25.47, B=22.14, C=41.71, D=49.63, E=24.97, F=2.57, G=5.69. The BPOM-registered samples generally met or exceeded their SPF claims, providing reliable protection, while the unregistered samples displayed significant inconsistencies with their labelled SPF values, raising concerns about their effectiveness and safety.
