However, most soy products are not made with 100% soy flour due to its bean flavor and poor texture quality. The addition of hydrocolloids helps to improve the rheological characteristics of gluten-free products. Hydroxypropyl methylcellulose (HPMC) is a suitable hydrocolloid to improve the specific volume and texture of gluten-free breads (Hager and Arendt, 2013, Kim and Wallace, 2011, Marco and Rosell, 2008 and Sabanis and Tzia, 2011).