Amaranth protein films prepared with high-pressure treated proteins

CONDES MA. CECILIA; MARIA CRISTINA AÑÓN; ADRIANA N MAURI

JOURNAL OF FOOD ENGINEERING

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 166 p. 38 - 44

0260-8774

This work studies the effect of using high-pressure modified amaranth proteins in the preparation of ediblefilm and compares the efficiency of high pressure and thermal treatment on the functionality of amaranthprotein films. This films were prepared by casting using glycerol as plasticizer from proteindispersions submitted to high pressure treatments of different intensity (0.1, 200, 400 and 600 MPa).Protein dispersions treated with high-pressure were able to form uniform films with better mechanicalproperties, lower water solubility and water vapor permeability than those prepared from non-treatedprotein dispersions without modifying its thickness, color and water content, but somewhat more opaque.This could be attributed to structural changes by high-pressure treatment, which favored proteinunfolding, increasing protein surface hydrophobicity and the amount of free SH, that werere-associated during film formation producing a higher crosslinking of matrixes that was denoted in abetter functionality of films. These films also showed better properties than those prepared with amaranthprotein isolates thermally treated.