Summary Ahipa is a gluten‐free starchy root, bearing phenolics and a protein content of ~9% db. Ahipa proteins are hydrosoluble, and thus, they are lost during starch extraction. The aim of this work was to recover ahipa proteins by isoelectric point (pI) precipitation to enrich ahipa and cassava starches. Both enriched starches had protein contents of ~2%, and their ATR‐FTIR spectra revealed bands characteristic of ahipa proteins. Enriched starches also contained phenolics in concentrations of 18–20 µg GAE/g. Enrichment lowered the whiteness index, but it remained higher than 90. Protein enrichment did not modify gelatinisation onset and peak temperatures but reduced the gelatinisation enthalpy of ahipa starch. Enriched starches produced less‐rigid buns than the native ones, with smaller and more homogeneously distributed alveoli in the crumb which resulted darker than the crust. Starch slurries acidified to the pI of ahipa proteins led to novel gluten‐free ingredients by an easy, low‐cost process.

In the present work, amaranth proteins were used as a functional ingredient of formulated food. An amaranth lemon sorbet, a healthy alternative dessert for celiac, vegan and any consumer that chooses to follow a conscious diet, was elaborated and characterized. The sorbet base mixture behaved like a pseudoplastic and thixotropic fluid, with a Kokini viscosity of 0.42 ± 0.07 Pa.s, a suitable value for elaborating products with good thickness characteristics. Aeration rate of the sorbet was 36.15 ± 3.48, an overrun value within the expected range of 30-50%, indicating that amaranth proteins presented adequate foaming properties in low pH elaboration conditions. Moreover, the stability study showed that the sorbet did not suffer significant changes in its structure over time during the first two months of storage at −20 °C. Sensory evaluation evidenced panelists accepted the product (8 ± 1, acceptability assay) and related it with airy, creamy and healthy attributes (CATA assay). Finally, simulated gastrointestinal digestion was able to release peptides capable of inhibiting fibrin clot formation (IC 50 = 3.4 ± 0.1 mg protein/mL), demonstrating that amaranth proteins could be used as a good foaming ingredient in the elaboration of potential functional foods with antithrombotic activity.