**2. Materials and methods**

#### **2.1 Materials**

White nixtamalized *masa* was purchased in a local store in Puebla, Mexico. The seaweed *M. pyrifera* was bought from ALGAS PACIFIC (Baja California, Mexico).

The reagents used for the extraction and quantification of the phenolic compounds and antioxidant activity were of analytic grade, and were purchased from Sigma-Aldrich Co (St. Louis, MO, USA).
