Psidium guajava L. leaves as source of proanthocyanidins: Optimization of the extraction method by RSM and study of the degree of polymerization by NP-HPLC-FLD-ESI-MS

1. Díaz-de-Cerio, E.
2. Pasini, F.
3. Verardo, V.
4. Fernández-Gutiérrez, A.
5. Segura-Carretero, A.
6. Caboni, M.F.