Antioxidants Antioxidants Valorization of onion waste by obtaining extracts rich in phenolic compounds and feasibility of its therapeutic use on colon cancer Paesa M. Universidad de Zaragoza Nogueira D. P. Velderrain-Rodríguez G. Esparza I. Jiménez-Moreno N. Mendoza G. Osada J. Universidad de Zaragoza Martin-Belloso O. Rodríguez-Yoldi M. J. Universidad de Zaragoza Ancín-Azpilicueta C. 2022 research-article