Caffeine analysis and extraction from a topical cream intended for UV-skin protection

1. Melero, A.
2. Guillot, A.
3. Carneiro, C.
4. Nuñez-Sanchez, H.
5. Rodríguez-Martí, L.
6. Chiari-Andréo, B.G.
7. Marto, J.
8. Ribeiro, H.
9. Garrigues, T.
10. Isaac, V.